Global ETD Search
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Showing 1 to 12 of 12 for “"Ortho Substituents"”.
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Dimethyl N-Aryl phosphoramidates : structural effects on bonding and solvolytic reactivity
… relationship for phosphoramidate with ortho substituents (6 = 0~85) is found to differ from that for substrates with meta and para substituents (S = 0,36). Determination of the thermodynamic parameters indicates that the entropy of activation is approximately constant for the substrates …
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Manganese-catalyzed carbonylation of alkyl iodides
… biphenyls and terphenyls, however only two ortho-substituents are tolerated in this transformation. The studies reportd herein aimed at the synthesis of tri- and tetra substituted biaryls, since they are important precursors to biaryl phosphine ligands. The project did not succeed due to …
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Investigations into dianionic scorpionate ligands and their metal complexes
… of these structures was varied using the ortho substituents on the phenol groups. The various tails also allowed the binding strength of the ligands to be varied. Studies on the activity of the complexes bearing these scorpionate ligands were performed. The effect of the steric size of the …
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Mononuclear and Dinuclear Complexes of Allylated alpha-Diimines as Catalysts for the Polymerization of Ethylene
… allyl functions at their backbones and different ortho substituents at the arene moieties of their frameworks. 21 different complexes were prepared using these compounds and they were characterized by mass spectroscopy and elemental analysis. These complexes were activated with methylalumoxane …
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Advances in the Stille reaction and new methods for continuous flow Pd-catalyzed C-N bond forming reactions
… were efficiently coupled under these conditions. Ortho-substitution on the stannane coupling partner was well tolerated; however, the presence of ortho substituents on the aryl sulfonates greatly reduced the efficiency of these reactions. Chapter 3: A continuous-flow, multistep Heck synthesis was …
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The Pd-catalyzed fluorination of (hetero)aryl bromides and triflates
… of electron-rich aryl triflates lacking ortho-substituents. Deuterium labeling experiments suggest that ortho-deprotonation of L-Pd(Ar)OTf intermediates by CsF competes with the transmetallation step of the desired catalytic process. Additional studies investigating the previously …
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Studies in stereoselective synthesis via reissert compound chemistry
… carbonyl rotamers were observed. The presence of ortho substituents on the aroyl moiety was found to greatly increase the chance amide isomerism on the NMR time scale. (-)-Menthy] chloroformate, (+)-menthy] chloroformate, and (-)-menthoxyacety] chloride have been utilized as chiral acyl …
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Peri-substituted dithianaphthalenes as sources of reactive intermediates in organic chemistry
… sulfur monoxide transfer reagents with dienes. ortho-Substituents on the naphthalene ring increased the rate and lowered the temperature at which SO transfer occurred. Treatment of the resulting sulfoxides under Pummerer conditions afforded the corresponding thiophenes. SO transfer was applied …
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Group 4 metal and vanadium bis(phenolato) complexes : synthesis, structure and olefin polymerisation activity
… their respective titanium complexes that large ortho-substituents are not required. To investigate cryptochiality, low molecular weight oligostyrenes were produced by optically active titanium catalysts. The molecular weight during polymerisation could be controlled by addition of 1-hexene as a …