The use of ligand in transition-metal catalysed reactions has had a considerable impact. The present manuscript aims at showing the influence of ligands in the palladium catalysed Suzuki-Miyaura cross-coupling reaction. In chapter one, the mechanism of this reaction will be described based on the numerous contribution published in the literature. It will be shown that the electronic and steric properties of the ligands have a huge repercussion on the catalytic activity of the metal. In the second chapter, the electronic and steric properties of the widely used Buchwald-phosphine ligand will be investigated. For this purpose, bis-carbonyl iridium(I) complexes were synthesized and their characterization allowed determining their TEP (Tolman electronic parameter) and their buried volume %V[subscript(bur)]. Then three next chapters of this thesis will focus on the syntheses and characterizations of new palladium complexes bearing N-heterocyclic carbenes (NHC). Their design was made in a view to obtain high activity in cross coupling reaction, particularly in the Suzuki-Miyaura cross coupling. Their activation under the catalytic conditions leads to the formation of palladium(0) species that can be mono- or bis-ligated. The influence of the ligand on the catalyst activity will be discussed. A palladium(II) precatalyst leading to mono-ligated active species will be described. Its activity in cross-coupling is very good, since activated and non-activated aryl chlorides could be coupled with aryl boronic acids at room temperature using low catalyst loadings. Unfortunately, the catalyst activity decreased with temperature. This result showed the fragility of the mono-ligated active species. In a view to obtain more robust catalysts that can perform high turnover numbers, new palladium(II) precatalysts bearing two ancillary ligands were developed. Mixed systems NHC- phosphites and NHC-phosphines are described. NHC-phosphites precatalysts displayed very good activity, but the phosphites are unfortunately sensitive to reaction conditions, limiting their role of active species shield. NHC-phosphine bearing complexes were highly active and could perform up to 10,000 turnovers with unactivated aryl chlorides. Very interestingly, these catalysts were also able to couple benzylchlorides and allyl chlorides with a wide range of boronic acids at very low catalyst loadings. These reactions had also the great advantage to proceed in aqueous solvents at very high substrate concentration. The activation mechanism of these complexes was investigated. Dichloropalladium(II) complexes were reduced under the catalytic conditions to lead palladium(0) species. Therein, it is shown that this reduction step was rate-determining in catalysis. Some palladium(0) intermediates xxiv were synthesized and showed good to excellent activities at low temperature under the exact same conditions. They displayed high reactivity towards oxygen and moisture and have to be handled under inert atmosphere. A particular complex had the ability to react with molecular dioxygen to form a stable peroxo-complex. Interestingly, this complex displayed excellent activity in water under aerobic conditions. This system was of great advantage since the reaction could be set up under air using cheap and user-friendly reagents displaying low toxicity. Moreover, the readily available distilled water used as solvent did not require prior degassing. Symmetrical and unsymmetrical bis-NHC palladium(0) complexes were successfully synthesized. They display excellent activity in the Suzuki-Miyaura cross coupling and turnover frequencies as high as 300 could be obtained at room temperature with unactivated arylchlorides and arylboronic acids. These complexes were also found excellent catalysts for the coupling of benzylchlorides with arylboronic acids. Mechanistic studies showed that no ligand dissociation occurred during the coupling suggesting as bis-ligated active species.

Thesis (MSc)--University of Stellenbosch, 2001. / ENGLISH ABSTRACT: This study comprises the preparation and characterization of various novel organometallic complexes of palladium(ll) which contain symmetric and unsymmetric (heteroatom-containing) r..-dicarbonyl-type ligands, T]3-heteroallyl ligands and T]3-coordinated trimethylsilyl-containing ligands. With the ultimate objective of preparing potential catalytic precursors similar to known catalytic precursors which exhibit hemilabile activity, the main goals of this study were the following: - • Investigate the coordination mode of the aforementioned ligand-types to the palladium of the starting compound, trans-[Pd(CeHs)CI{P(CeHshhl (1), by physical measurements. • Carry out single crystal structure determinations where possible. • Investigate the influence of the properties of the ligands on the stability of the prepared complexes. • Investigate the existence of hemilability (if any) in the prepared complex. The deprotonated symmetric and unsymmetric f!,-dicarbonyl-type ligands readily bind to the palladium of the starting compound in a bidentate fashion through the oxygens by displacing a triphenylphosphine group and producing easily removable sodium chloride. These complexes show that a negative charge can be accommodated in a delocalized fashion by the -S=O and - P=O groups of these acac--type ligands in a similar manner to the carbonyl groups of acetylacetonate. However, no evidence of hemilabile activity was found in this series of complexes. In a similar fashion, the deprotonated T]3-heteroallyl ligands, L = [PhzPS£], [PhCOz-], [PhC{NSi(CH3hhl [(Ph)zP{NSi(CH3hh-], were linked to palladium in the same starting complex, in T]3-fashion by triphenylphosphine substitution. No evidence of hemilabilty was evident in this series of complexes, but when L = [PhzPSz-], an exchange of the coordinated triphenylphosphine group with the free triphenylphosphine group was observed in the reaction mixture. Finally, the preparation, isolation and spectroscopic characterization of several T\3-allyl paliadium(lI) complexes with ligands of the type R-TeCH2CH2CQQCH3, (R = isopropyl, t-butyl ,ethyl) were attempted with the compound bis-( T\3-allyl )-di-~ -iodo-dipalladium( II), [T\3 -( CH2CHCH2J2Pd212J, which had also now been crystallographically characterized. Chelate formation by TeAQ coordination seemed possible by halide precipitation with silver tetrafluoroborate. Unfortunately the resulting compounds were too unstable to be isolated in the pure form for characterization. / AFRIKAANSE OPSOMMING: Die studie behels die bereiding en karakterisering van verskeie nuwe palladium(lI) organometaalkomplekse met inbegrip van simmetriese en onsimmetriese (heteroatoom bevattende) ~-dikarboniel-tipe ligande, 113- heteroallielligande en 113_gekoordineerdetrimetielsiliel bevattende ligande. Met die beoogde einddoel die bereiding van potensiele katalitiese voorgangers soortgelyk aan bekende katalitiese voorgangers met hemilabiele aktiviteit, sluit die hoof mikpunte van die studie die volgende in: - • 'n Ondersoek na koordinasie-wyse van die bogenoemde ligand tipes aan die palladium van die uitgangstof, trans-[Pd(C6Hs)CI{P(C6Hshhl (1), met behulp van fisiese bepalings. • Enkel kristal struktuur bepalings waar moontlike. • 'n Ondersoek na die invloed van die einskappe van die ligande op die stabilitiet van die komplekse. • 'n Ondersoek na die bestaan van hemilabiele aktiwiteit (indien enige) in die voorbereide complekse. Die gedeprotoneerde simmetriese en onsimmetriese ~-dikarboniel-tipe ligande het geredelik, bidentaat deur middel van die suurstowwe gebind aan die palladium van die uitgangstof deur die verplasing van die trifenielfosfien group en die vorming van verweiderbare natriumchloried. Hierdie komplekse dui aan dat 'n negatiewe lading wei geakkommodeer kan word deur delokalisasie by die -S=O- en -P=O-groepe van hierdie acac"-tipe Iigande, soortgelyk aan die karbonielgroep van asetielasetonaat. Geen hemilabiliteit is waargeneem in hierdie reeks komplekse nie. Die gedeprotoneerde 113-heteroalliel Iigande, L = [Ph2PS£), [PhCO£), [PhC{NSi(CH3h}£), [(PhhP{NSi(CH3hhl is op 'n soortgelyke wyse 113- gekoppel aan palladium van dieselfde uitgangstof met trifenielfosfien verplasing. Geen hemilabiliteit is waargeneem in hierdie reeks komplekse nie, maar wanneer L = [Ph2PS£], is 'n uitruiling van 'n gekoordineerde trifenielfosfien met 'n vrye trifenielfosfien in die reaksiemengsel waargeneem. Die bereiding, isolasie en spektroskopiese karakterisering van Tj3-alliel paliadium(lI) komplekse met ligande van die tipe R-TeCH2CH2COOCH3, (R = isopropiel, t-butiel ,etiel) is gepoog met die uitgangstof bis-(Tj3-alliel)-di-ll-iododipaliadium( II), [Tj3-(CH2CHCH2hPd2b], wat volledig gekarakteriseer was. Chelaat-vorming deur TeAO-koordinasie het moonlik blyk te wees deur halied presipitasie met behulp van AgBF4. Die komplekse is baie onstabiel en is dit gevolglik nie moontlik am die komplekse suiwer te isoleer en te karakteriseer nie.

This thesis describes the synthesis, structure/bonding studies and reactivity of cationic terminal borylene complexes. Reactions of the cationic terminal borylene complexes, [CpFe(CO)₂(BNR₂)]⁺[BArf₄]⁻ (R = Cy, ⁱPr) with heteroallenes have been investigated and shown to proceed by initial coordination of the substrate at the electrophilic boron centre. Reaction with isocyanate ultimately forms [CpFe(CO)₂(CNPh)]⁺[BArf₄]⁻ by a net metathesis process. Dicyclohexylcarbodiimide, however, reacts by insertion into the Fe=B bond of the aminoborylene to form [CpFe(CO)₂C(NCy)₂BNR₂]⁺[BArf₄]⁻. An excess of the substrate yields the spirocyclic complex, [CpFe(CO)₂C(NCy)₂B(NCy)₂BNR₂]⁺[BArf₄]⁻ via a second insertion into the B=N bond. Computational studies investigating insertion and metathesis reaction pathways of these aminoborylene complexes are also reported. Reactions of dicyclohexylcarbodiimide with three-coordinate aminoborane and aminoboryl complexes are described. Formation of the first boron guanidinate complexes featuring dihalide substituents, Cy₂NC(NCy)₂BCl₂ and ⁱPr₂NC(NCy)₂BCl₂ by both salt metathesis and carbodiimide insertion routes are reported. The aminoboryl complexes, CpFe(CO)₂B(NPh₂)Cl and CpFe(CO)₂B(NBz₂)Cl have also been synthesized and their reactions with carbodiimides probed. A novel cationic terminal borylene complex, [Cp'Fe(CO)₂(BNⁱPr₂)]⁺ [BArf₄]⁻ featuring a methyl-substituted Cp ring is reported and represents the first structurally characterized isopropyl substituted aminoborylene complex. Substitution of the ancillary carbonyl ligands of cationic terminal borylene complexes has been investigated. Irradiation of the aminoboryl precursor complex, CpFe(CO)₂B(NCy₂)Cl in the presence of trialkylphosphines, PR₃ (PR₃ = PMe₃, PPh₃, P(OMe)₃) yield the mono(phosphine) complexes, CpFe(CO)(PR₃)B(NCy₂)Cl. The mono(substituted) dimer [{CpFe(CO)(BNCy₂)}₂(μ-dmpe)] was also formed from the reaction with the chelating ligand, dmpe. Replacement of the second carbonyl is prevented by the steric bulk of the dicyclohexylamino substituent, and instead [CpFe(CO)(PR₃)₂]⁺Cl⁻ is formed by extrusion of the borylene fragment. The mono(phosphine) ligated cationic terminal borylene complexes, [CpFe(CO)(PR₃)(BNCy₂)]⁺[BArf₄]⁻ were subsequently formed by halide abstraction. Both [CpFe(CO)(PMe₃)(BNCy)₂]⁺[BArf₄]⁻ and the bridging dication [{CpFe(CO)(BNCy₂)}₂(μ-dmpe)]₂⁺[BArf₄]⁻₂ were structurally authenticated. Replacing the bulky cyclohexyl groups of the aminoboryl precursor for methyl groups allowed synthesis of the bis(substituted) complexes, CpFe(PMe₃)₂B(NMe₂)Cl and CpFe(dmpe)B(NMe₂)Cl. Extraction of these complexes into dichloromethane resulted in formation of the borylene, [CpFe(PMe₃)₂(BNMe₂)]⁺Cl⁻ and [CpFe(dmpe)(BNMe₂)]⁺Cl⁻ by spontaneous halide ejection.

The synthesis and characterisation of a series of novel borane, boryl and borylene complexes of electron rich group 8 and 9 metal centres are described in this thesis. Chapter 3 reports on the properties of a highly nucleophile tolerant borylene system, [CpFe(dmpe)(BNMe₂)]⁺, together with its surprising formation via an unprecedented spontaneous halide ejection process. The incorporation of strongly electron releasing ancillary phosphine ligands is reflected by an Fe-B distance (ca. 1.80 Å) which is more akin to alkyl/aryl substituted borylene complexes, and perhaps more strikingly, by the very low exothermicity associated with the binding of pyridine to the two-coordinate boron centre (∆H = -7.4 kcal mol⁻¹ cf. -40.7 kcal mol⁻¹ for BCl₃). Despite the strong π electron release from the metal fragment implied by this suppressed reactivity and short Fe-B bond, the barrier to rotation about the Fe=B bond in the asymmetric variant [CpFe(dmpe){BN(C₆H₄OMe-4)Me}]⁺ is very small (ca. 2.9 kcal mol⁻¹). This apparent contradiction is rationalised by the orthogonal orientations of the HOMO and HOMO-2 orbitals of the [CpML2]⁺ fragment, which mean that the M-B π interaction does not fall to zero even in the highest energy conformation. The reactivities of the aminoboryl complexes, CpFe(CO)₂B(NR₂)Cl (R = Me, Cy), towards electrophiles (H⁺, Me⁺) are discussed in Chapter 4, with a view to probing potential modification of the boryl ligand substituents. The reaction of CpFe(CO)₂B(NCy₂)Cl with [Me₃O][BF₄] leads to the formation of CpFe(CO)₂B(NCy₂)F. Subsequent reactivity with Brookhart’s acid results in the formation of the known difluoroboryl system CpFe(CO)₂BF₂. Reaction of the dimethylaminoboryl complex CpFe(CO)₂B(NMe₂)Cl with [Me₃O][BF₄] generates CpFe(CO)₂BF₂ directly; however, reaction of CpFe(dmpe)B(NMe₂)Cl with [Me₃O][BF₄] is limited to the formation of CpFe(dmpe)B(NMe₂)F, presumably on steric grounds. Additionally, given the enhanced stability of the bis(phosphine) ligated systems, [CpM(PR₃)₂(BNR2)]⁺ compared to related dicarbonyl ligated complexes, it has also proved possible to synthesise other borylene complexes e.g. [CpFe(dmpe)(BOMes)]⁺ which are otherwise unstable under ambient conditions. Chapter 5 reports the coordination and B-H bond activation of aminoboranes at ruthenium and iridium metal centres. Reaction of aminoboranes, H₂BNR₂, with 14-electron fragments of the type [Cp*RuL]⁺, leads to κ² coordination. The interaction with 16- electron fragments, [CpRu(PR₃)₂]⁺, has also been probed. In contrast to side on-binding of isoelectronic alkene donors, an alternative κ¹-(σ-BH) mode of aminoborane ligation has been established, albeit with binding energies only ~ 8 kcal mol⁻¹ greater than for those for analogous dinitrogen complexes. Variations in ground-state structure and exchange dynamics as a function of the phosphine ancillary ligand set are consistent with chemically significant back-bonding into an orbital of B-H σ* character. By contrast, simple borane coordination compounds prove difficult to isolate on addition of aminoboranes, H₂BNR₂, to <m>in situ</m> generated sources of [(p-cymene)Ru(PR₃)Cl]⁺; spontaneous loss of HCl to generate a rare class of primary hydridoboryl complexes is witnessed instead. Attempts to synthesise boryl complexes via simple oxidative addition of monomeric aminoboranes have also proved successful, through the use of electron rich iridium precursors containing the [Ir(PMe₃)₃] fragment. This step results in the synthesis of novel amino(hydrido)boryl complexes, Ln(H)M{B(H)NR₂}; subsequent conversion (on loss of an ancillary ligand) to a borylene dihydride system proceeds via a novel B-to-M α hydride migration. The latter step is unprecedented for group 13 ligand systems and is remarkable in offering α-substituent migration from a Lewis acidic centre as a route to a two-coordinate ligand system.

The main electrophilic source used in radiolabelling is [18F]F2, which is highly reactive, toxic and requires specialist equipment for safe handling. The Gouverneur group has initiated a research programme focused on the preparation of new stable and easy-to-handle N-18F reagents. In the development of [18F]radiolabelling reactions it would be extremely valuable to develop a library of selective N-18F reagents possessing reactivity tailored to the desired chemical transformation. The aim of this thesis is to further assess the scope of electrophilic N- 18F reagents in new transformations for the construction of C-18F bonds.

This thesis documents the development of novel synthetic methodologies for the incorporation of sulfur dioxide into organic molecules employing the amine-sulfur dioxide complex DABSO (vide infra). These developed processes serve to access a range of sulfonyl-containing (-SO₂-) compounds including sulfones and sulfonamides, via sulfinic acid precursors. <b>Chapter 1</b> provides an overview of the synthesis and applications of sulfonyl-containing compounds and the organic chemistry of sulfur dioxide. A comprehensive introduction to the developed uses of sulfur dioxide surrogates in organic chemistry is given. The synthetic utility of metal sulfinates towards accessing sulfonyl-containing compounds is also discussed. <b>Chapter 2</b> details the development of a one-pot sulfone synthesis via metal sulfinates generated from organometallic reagents and DABSO. Alkyl, alkenyl and (hetero)aryl sulfinates prepared from organolithium and Grignard reagents can be efficiently coupled with a range of electrophiles to access a range of products including diaryl, aryl-heteroaryl and &beta;-hydroxy sulfones. <b>Chapter 3</b> describes an array-compatible, one-pot sulfonamide synthesis employing metal sulfinates and N-chloroamines as in situ-generated intermediates. This employs DABSO and sodium hypochlorite (bleach) as simple reagents and organolithium, organozinc and Grignard reagents along with amines as readily-accessible building blocks. The robust nature of this methodology and its potential application in discovery chemistry is demonstrated with a 65-compound array synthesis. <b>Chapter 4</b> documents the development of a palladium-catalysed sulfination reaction of boronic acids to access a range of sulfonyl-containing compounds. This involved the establishment of a one-pot/one step synthesis of sulfones leading to the discovery of a redox-neutral, ligand-free sulfination procedure using DABSO and palladium(II) catalysis. Sulfinic acid derivatives can be generated and subsequently trapped in situ with a variety of electrophiles to furnish sulfones and sulfonamides. <b>Chapter 5</b> summarises the research and the potential future work. <b>Chapter 6</b> provides experimental details and data.

Chapter 1 is a literature review of selected palladium-catalysed aryl C-N and C-S bond forming reactions. The application of these reactions to the synthesis of heterocycles is also discussed. Chapter 2 highlights the importance of the benzimidazole motif and gives a brief discussion of the existing routes to this scaffold. The utility of N-(o-halophenyl)imidoyl chlorides and imidates as precursors to heterocycles is demonstrated in a palladium-catalysed reaction with N-nucleophiles to afford benzimidazole products. Chapter 3 provides a brief introduction to the synthesis of benzothiazoles and describes efforts towards the use of our established substrates for the preparation of these heterocycles. This is achieved via reaction of N-(o-chlorophenyl)imidoyl chlorides with a sulfur nucleophile in a metal-free process. Chapter 4 is a literature review of palladium-catalysed carbonylation chemistry with specific focus on aminocarbonylation and thiocarbonylation reactions of aryl halides. Heterocycle syntheses which employ such carbonylative methods are also discussed. Chapter 5 describes existing protocols for the synthesis of quinazolinones. A novel palladium-catalysed synthesis of these heterocycles from the reaction of our imidate substrates with an amine and carbon monoxide is described. This further demonstrates their utility as general heterocycle precursors

This thesis explores the reactivity of amine-boranes with the {Rh(Xantphos)}+ fragment, with the aim of gaining mechanistic insight into the catalytic dehydropolymerisation of the amine-borane H₃B∙NMeH₂ to yield the polyaminoborane [H₂BNMeH]_n. Chapter 2 describes the synthesis of suitable Rh^III and Rh^I Xantphos precursors to be used in this investigation. Moreover, the first example of the dehydrogenative B—B homocoupling of the tertiary amine-borane H₃B∙NMe₃ to form H₄B₂•2NMe₃ is reported. The synthesis of the Rh^I precatalyst introduced in Chapter 2 entails the hydroboration of tert-butylethylene by H₃B∙NMe₃. In Chapter 3, the ability of the {Rh(Xantphos)}+ fragment to mediate this hydroboration in a catalytic manner is explored, and a mechanism is presented in which reductive elimination is proposed to be turnover-limiting. Other alkenes and phosphine-boranes are also trialled to determine the scope of the hydroboration. Chapter 4 investigates the catalytic dehydrocoupling of H₃B∙NMe₂H and H₃B∙NMeH₂ with {Rh(Xantphos)}+ to form the dehydrocoupling products [H₂BNMe₂]₂ and [H₂BNMeH]_n, respectively, and the dehydrocoupling mechanisms are shown to be similar. Both involve an induction period in which the active catalyst is formed (thought to involve N—H activation), and saturation kinetics operate during the productive phase of catalysis. H₂ is shown to inhibit the dehydrocoupling, and lead to production of shorter chain [H₂BNMeH]_n. Conversely, using THF as the dehydropolymerisation solvent instead of C₆H₅F results in longer chain [H₂BNMeH]_n. Finally, Chapter 5 presents new dicationic {Rh(Xantphos)}-based dimers, the formation of which involves loss of a phenyl group from the Xantphos ligands by P—C activation. The dimers are produced by routes involving either dehydrogenative homocoupling of H₃B∙NMe₃, or dehydrocoupling of H₃B∙NMe₂H. One of these dimers was tested as a catalyst for the dehydrocoupling of H₃B∙NMe₂H, and the reaction kinetics appear closely related those obtained using {Rh(Xantphos)}+, suggesting that the active catalysts in each system may be related.

The focus of this thesis is the synthesis of organometallic complexes incorporating the η8-permethylpentalene titanium moiety (η⁸-Pn*Ti), their characterisation, and their reactivity with small molecules. <b>Chapter One</b> summarises the chemistry of the pentalene molecule, from its instability in the free state to the incorporation of the hydrocarbon into organometallic complexes. The chapter continues with a review of the coordination modes available to Pn and concludes with a brief discussion on the effects of permethylation of hydrocarbon ligands and the advent of permethylpentalene (Pn*). <b>Chapter Two</b> documents the improved synthesis of [Pn*TiCl(μ-Cl)]₂ utilising isomeric control imparted on the Pn* synthon, Pn*(SnMe₃)₂. This protocol permits access to a variety of methylated compounds through metathesis chemistry, of which five have been crystallographically elucidated, revealing the fold angle to be reliant on an interplay between steric and electronic factors. Mono-, bi- and trimetallic {Pn*TiMe₂, [Pn*TiMe(μ-Cl)]₂ and [Pn*Ti(μ-Me)]₂(μ-CH₂), and [Pn*TiMe(μ-Me)₂]₂Mg respectively} species were synthesised dependent on the methylating agent employed and they displayed varying thermal stabilities, with the dimeric nature of [Pn*TiMe(μ-Cl)]₂ proving crucial in the formation of [Pn*Ti(μ-Cl)]₂(μ-CH₂). <b>Chapter Three</b> describes the incorporation of classical organometallic ligands into the Pn*Ti moiety, including the first examples of benzyl, alkyl, aryl, allyl and η¹-Cp bound to a PnTi fragment. Seven complexes have been structurally characterised including the first ever crystal structure of a π-hydrocarbon bound Ti species bearing two CH₂^tBu groups, Pn*Ti(CH₂^tBu)₂, and the fluxional mixed hapticity complex Pn*Ti(η⁵-Cp)(η¹-Cp), whose η¹-Cp rearranges via a 1,2-sigmatropic shift. <b>Chapter Four</b> investigates the reactivity of the monomeric dialkyls, Pn*TiR₂ (R = Me, CH₂Ph, CH₂SiMe₃ and CH₂^tBu) with CO₂, CO and H₂. All four compounds demonstrate “normal” insertion of the CO₂ moiety into both Ti-R bonds, revealing a symmetrical bidentate coordination of the RCO₂ units. Computational studies have highlighted two competing pathways for their reaction with CO, dependent on the concentration of CO and size of R, which results either in formation of an enediolate or a titanoxirane. The reaction with H₂ yields the fascinating trimeric mixed valence, [Pn*Ti(μ₂-H)]₃(μ₃-H), the first structurally characterised example of a trimeric Ti-H species and the first to include a Ti-(μ₃-H) moiety. (Pn*TiCl)₂(μ-O) is formed by the action of adventitious H₂O and possesses a linear Ti-O-Ti bridge with a degree of Ti-O double bond character, supported by crystallographic data and DFT calculations. <b>Chapter Five</b> discusses ethylene polymerisation studies on the monomeric dialkyl complexes Pn*TiR₂ (R = Me, CH₂Ph, CH₂SiMe₃ and CH₂^tBu) using the activators [Ph₃C][B(C₆F₅)₄], [PhNMe₂H][B(C₆F₅)₄], AlⁱBu₃ and H₂. <b>Chapter Six</b> presents full experimental procedures for all of the syntheses and reactions outlined in Chapters Two to Five. <b>Chapter Seven</b> details characterising data for all novel compounds, and crystallographic data in the form of CIF files may be found in the electronic version.

by Man-Hang Chan. / Thesis submitted in 1997. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1998. / Includes bibliographical references. / Abstract also in Chinese. / Contents --- p.i / Acknowledgements --- p.iii / Abstract --- p.iv / 摘要 --- p.v / Abbreviations --- p.vi / Chapter CHAPTER I --- INTRODUCTION / Chapter I.1 --- "Organometallic chemistry of group 11 elements (Cu, Ag, Au)" --- p.1 / Chapter I.1.1 --- Organocopper(I) compounds --- p.3 / Chapter I.1.2 --- Organosilver(I) compounds --- p.5 / Chapter I.1.3 --- Organogold(I) compounds --- p.7 / Chapter I.2 --- Dimethylpyrazine as a ligand precursor --- p.9 / Chapter I.3 --- Objective of this work --- p.11 / Chapter I.4 --- References --- p.13 / Chapter CHAPTER II --- METALLATION OF DIMETHYLPYRAZINE / Chapter II. 1 --- Introduction --- p.17 / Chapter II. 1.1 --- N-functionalized alkyl ligands --- p.17 / Chapter II. 1.2 --- Synthetic methods --- p.18 / Chapter II. 1.3 --- Synthesis of alkyl ligands with N-functionality --- p.20 / Chapter II.2 --- Results and discussion --- p.22 / Chapter II.2.1 --- "Metallation of 2,3-dimethylpyrazine" --- p.22 / Chapter II.2.2 --- "Metallation of 2,5-dimethylpyrazine" --- p.26 / Chapter II. 2.3 --- "Metallation of 2,6-dimethylpyrazine" --- p.29 / Chapter II.2.4 --- Characterization of compounds --- p.34 / Chapter II. 3 --- Experimental --- p.51 / Chapter II. 4 --- References --- p.57 / Chapter CHAPTER III --- SYNTHESIS AND STRUCTURE OF COPPER(I)AND SILVER(I) COMPOUNDS / Chapter III.l --- Introduction --- p.59 / Chapter III.1.1 --- Synthesis of Group 11 metal alkyl complexes --- p.59 / Chapter III.1.2 --- Structures of Group 11 metal alkyl complexes --- p.61 / Chapter III.2 --- Results and Discussions --- p.63 / Chapter III.2.1.1 --- Synthesis of [Cu{CH(ButMe2Si)C5H4N-2}]4 --- p.63 / Chapter III.2.1.2 --- Reaction of [PictLi] with AgBF4 and AI --- p.64 / Chapter III.2.1.3 --- Characterization of compounds --- p.65 / Chapter III.2.1.4 --- Molecular structure of[Cu{CH(ButMe2Si)C5H4N-2}]4 --- p.67 / Chapter III.2.2 --- Synthesis of [Cu{C(Ph)(SiMe3)C5H4N -2}]2 --- p.73 / Chapter III.2.3.1 --- Reaction of CuI with [DZ´حLi2] and [DZLi2] --- p.73 / Chapter III.2.3.2 --- Reaction of CuI with [DZ'Li] --- p.75 / Chapter III.2.4 --- Characterization of compounds --- p.75 / Chapter III.2.5 --- Attempted reaction of [Q'Li(TMEDA)] with CuCI and CuCl2 --- p.77 / Chapter III. 3 --- Experimental --- p.78 / Chapter III. 4 --- References --- p.87 / Appendix --- p.89