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The Global ETD Search service is a free service for researchers
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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.
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Showing 81 to 90 of 643 (0.091 seconds)Spelling suggestions: "subject:"achemical eeactions"" "subject:"achemical feactions""
| 81 |
The effect of silver catalyst on the chloride-chlorate reactionObijeski, Todd James 05 1900 (has links)
No description available.
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| 82 |
An investigation of the interfacial polymerization of polyamides in a tubular reactorDowdy, William Wills 08 1900 (has links)
No description available.
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| 83 |
A kinetic study of the partial oxidation of propylene to acrolein over mixed metal oxidesOakes, Jean Drawdy 08 1900 (has links)
No description available.
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| 84 |
Analytical expressions for slow pseudo-second order reactions in plumes : comparison with experimental resultsHeffner, David Alan 05 1900 (has links)
No description available.
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| 85 |
Preparation and characterization of dispersed copper on silica as model catalystsKenvin, Jeffrey Charles 08 1900 (has links)
No description available.
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| 86 |
Chemical reaction and chromatographic separation in a packed tubular reactorLewis, Charles Turner 12 1900 (has links)
No description available.
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| 87 |
Investigation of the mechanistic processes for shock-induced chemical reactions in Ti-Si, Ti-Al, and Ti-B powder mixturesRoyal, Tyrus E. 12 1900 (has links)
No description available.
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| 88 |
Reaction paths in the thermite syntheses of TiB₂ and TiB₂-Al₂O₃Sundararm, Venkatesh 12 1900 (has links)
No description available.
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| 89 |
Some elementary reactions of hydroxyl radicals with atmospheric pollutantsSmith, R. E. January 1984 (has links)
No description available.
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| 90 |
An unusually stable dianion : cycloalkylidenemalononitrile dianion characterized by NMR, IR, MS & MNDOHuang, Wayne W. January 1989 (has links)
The dianion of cyclopentylidenemalononitrile (CPDM2-) can be characterized by dialkylation. The adducts formed in diallylation have been studied both experimentally and theoretically. Diallyl-CPDM has been characterized by 1H and 13C NMR, IR spectrum and by its fragmentation pattern in the mass spectrum. The chemical reactivity of CPDM2- is easily explained or predicted using the frontier molecular orbitals, FMO, calculated using MNDO method. The evidences from NMR, IR, MS and the prediction from MNDO calculation were highly consistent. The results indicate a very stable dianion having a pattern of reactivity that is observed experimentally and predicts the isomeric structure of its alkylation product, Diallyl-CPDM (Isomer A), consistent with MS, IR and NMR experiments.Cyclohexylidenemalononitrile dianion (CHDM2-) has been generated by two dimetalating systems, n-butyllithium/DMSO and Dimsyl/DMSO, and examined by 1H and 13C NMR in DMSO-d6. The 13C NMR spectra of CHDM2- has been interpreted by means of MNDO atomic charge, attached proton test APT, Nuclear Overhauser Effect and chemical shift reference data. The generation of this dianion is accompanied by appropriately characteristic changes in the 13C chemical shifts.MNDO calculations have been performed for all molecules of interest, and found to be useful and reliable for the study of Y-conjugated dianionsof cycloalkylidene-malononitriles. The correlation of MNDO atomic charge vs empirical 13C chemical shift was found to be linear for sp2 conjugated carbons of negative-charged nitriles and the empirical equation, s = 44.9p + 125.4, predicts chemical shifts with only 2.14% average percent error. With FORCE calculation, MNDO method can calculate the frequencies of CPDM and CHDM with only 0.65% average error which was superior than AM1 method (3.87%). Moreover, systematic MNDO calculations of over 30 nitrile molecules have been carried out giving; heats of formation, electronic energy, core-core energy, dipole moment and ionization potential.The conformation of CHDM2- has been analyzed with MNDO optimized geometry and found to have 45° twist within the Y-conjugated n-system of the dianion. Double-LithiumBridging-Structure, the simple model of dilithio-CHDM, has been proposed based on Ion Triplets Theory and MNDO charge distribution, and its electronic energy was calculated from the distances of point charges in this model. The results indicate that the Li counterion can stabilize the dianion. / Department of Chemistry
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