• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 319
  • 208
  • 69
  • 39
  • 38
  • 15
  • 12
  • 6
  • 5
  • 4
  • 4
  • 4
  • 3
  • 3
  • 3
  • Tagged with
  • 839
  • 134
  • 100
  • 92
  • 91
  • 89
  • 87
  • 74
  • 61
  • 61
  • 49
  • 44
  • 42
  • 40
  • 37
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

Synthetic studies towards ptilomycalin A

Williams, Harri Lloyd January 1996 (has links)
No description available.
32

Synthetic studies of eupolauridine and eilatin.

January 1991 (has links)
by Tat-hung Tong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1991. / Includes bibliographical references. / Chapter I. --- Acknowledgements --- p.(1) / Chapter II. --- List of Nomenclatures --- p.(2) / Chapter III. --- Abstract --- p.(4) / Chapter IV. --- Introduction --- p.(5) / Chapter V. --- Results and Discussion --- p.(12) / Chapter (1) --- Synthetic Strategy --- p.(12) / Chapter (2) --- Preparation of onychine (4) --- p.(13) / Chapter (3) --- Preparation of eupolauridine (1) --- p.(25) / Chapter (4) --- "Preparation of benzo-annulated derivative of eupolauridine : 2,3-benzo-l ,6-diazafluoranthene (9)" --- p.(26) / Chapter (5) --- "NMR data interpretation of 2,3-benzo-4-aza-l-methyl-fluoren-9-one (12) and 2,3-benzo-l,6-diazafluoranthene (9)" --- p.(27) / Chapter (6) --- Synthetic study of eilatin (10) --- p.(32) / Chapter VI. --- Conclusion --- p.(36) / Chapter VII. --- Experimental Section --- p.(37) / Chapter VIII. --- References --- p.(56) / Chapter IX. --- NMR Spectra --- p.(58)
33

The synthesis of aromatic and aza analogues of phthalideisoquinoline / by Tran Viet Hung

Tran Viet Hung January 1981 (has links)
Typescript (photocopy) / v, 169 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.) Dept. of Organic Chemistry, University of Adelaide, 1982
34

An approach toward the synthesis of euonyminol and cathedulin K- 19

Shin, Hyunik 11 January 1994 (has links)
A synthetic approach toward the two major fragments of cathedulin K-19, euonyminol (4) and dimethyl cathate (69), was investigated. Synthesis of dimethyl cathate was accomplished in 3 steps starting from 73. Efforts directed towards the synthesis of euonyminol, a highly oxygenated dihydroagarofuran sesquiterpene, was advanced to a stage in which most of the A ring of 4 was completed. Compound 79 was used as a starting material which was obtained from a Diels-Alder reaction of 80 and 81. Subsequent bromination of 79 and elimination of hydrogen bromide afforded 93 in a one-pot operation. A remarkable chemo- and stereoselective reduction of 93 under Luche conditions gave 94 and the latter was epoxidized stereoselectively by m-chloroperbenzoic acid to yield 91. Introduction of an isopropenyl moiety to 91 was accomplished following Liotta's protocol to provide 145. Vanadium catalyzed epoxidation installed the epoxide moiety of 152a with good stereoselectivity. Two approaches towards 4 from the key intermediate 152a were pursued. The first approach entailed the epoxide cascade reaction of 152a. Treatment of 152a with trifluoro- or trichloroacetic acid afforded 165 and 166, respectively, which possessed most of the functionality required for 4. The second route to 178 proceeded in 5 steps from 152a. Treatment of 152a with titanium tetraisopropoxide afforded 168, which was cyclized to 169 under acid catalysis. The diol moiety of 169 was protected as a benzylidene acetal and subsequent hydroxylation following Davis' procedure afforded 171. Stereoselective reduction of 171 using lithium aluminum hydride in the presence of titanium tetraisopropoxide provided 178. / Graduation date: 1994
35

Studies towards a total synthesis of alkaloids manzamine A and cylindrospermopsin and development of a complex example of the Dowd-Beckwith rearrangement

Havas, Fabien, January 2004 (has links)
Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains xviii, 465 p.; also includes graphics. Includes abstract and vita. Advisor: David J. Hart, Dept. of Chemistry. Includes bibliographical references (p. 253-262).
36

Synthetic studies and biological evaluation of imidazole-containing marine alkaloids

Schmid, Lesley Ann. January 2008 (has links)
Thesis (Ph.D.) -- University of Texas at Arlington, 2008.
37

Phytochemische onderzoekingen over alkaloïden in verband met het kiemen ...

Dijck, Emile Bernard van. January 1900 (has links)
Inaug.-diss.--Utrecht.
38

Syntheses of the alkaloid, graveoline and related methylenedioxy 2-aryl-4-quinolones [sic].

Loh, Yung-sen, Lucy. January 1962 (has links)
Thesis (M. Sc.)--University of Hong Kong, 1963. / "References": leaves 124-133. Type-written copy.
39

Alkaloids from Hong Kong plants.

Chan, Po-kuen, Rosalind. January 1962 (has links)
Thesis (M. Sc.)--University of Hong Kong, 1963. / Type-written copy. Includes bibliographical references.
40

Synthetic study of seco-yuehchukene and inverto-yuehchukene /

Lee, V. J. January 1987 (has links)
Thesis (M. Phil.)--University of Hong Kong, 1988.

Page generated in 0.0676 seconds