Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 72 for “"Substitution reactions."”.
-
Kinetics and Mechanisms of Substitution Reactions of Dicobalt Octacarbonyl
… Co(,2)(CO)(,7)L and Co(,2)(CO)(,6)L(,2). These reactions exhibit first order dependence on concentration of carbonyl, no dependence on concentration of base, and inhibition of rate of reaction by added CO.
-
Enantioselective lateral lithiation-substitution reactions using benzamide directing groups
Reactions involving organolithium reagents under the influence of the chiral ligand to affect the enantioselective replacement of a carbon-proton bond with a carbon-carbon bond or a carbon-heteroatom bond are described.
-
The effect of high pressure on substitution reactions and chemical equilibria
x, 167 leaves : ill. ; 26 cm.
-
Radical Chain Pathways in Substitution Reactions of Transition Metal Carbonyl Compounds
Made available in DSpace on 2014-12-13T20:10:08Z (GMT). No. of bitstreams: 1 7803921.pdf: 4955073 bytes, checksum: 0b765ac29b25753669ae9c48c38b5bda (MD5) Previous issue date: 1977
-
The effect of methyl groups on nucleophilic substitution reactions of chlorocyclotriphosphazenes
The reactions of methyl-substituted chlorocyclotriphosphazenes with aryl Grignard reagents and with bifunctional amines, aminoalcohols, and alkoxides were investigated. The characterization data for the compounds formed in the reactions of monomethylpentachlorocyclotriphosphazene and the Grignard …
-
Kinetics of the Substitution Reactions of Triaryl Group-Iv-Metal - Cobalttetracarbonyl Compounds
Made available in DSpace on 2014-12-10T23:01:42Z (GMT). No. of bitstreams: 1 7412009.pdf: 2732333 bytes, checksum: 9914ea45a8c2a72280d06512abc17b88 (MD5) Previous issue date: 1973
-
Kinetics and Mechanisms of Substitution Reactions in Group Vii Metal Carbonyl Hydride Complexes
Made available in DSpace on 2014-12-13T20:09:34Z (GMT). No. of bitstreams: 1 7606710.pdf: 5622469 bytes, checksum: 1404b82740fa2b26b969427ddd9171c4 (MD5) Previous issue date: 1975
-
Substitution Reactions of Cis-Dichloro-(beta,beta',beta'')-Triaminotriethylamine)-Cobalt(iii) Complex Ion
Made available in DSpace on 2014-12-05T19:37:29Z (GMT). No. of bitstreams: 1 6003953.pdf: 4161047 bytes, checksum: 290e9a66806b7d8d89b7fa4cd72e66a7 (MD5) Previous issue date: 1960
-
Studies of some elimination and substitution reactions in a series of l-arylnaphthalene tetrachlorides
The heterolytic chlorination of 1-arylnaphthalene (aryl = 1(p-nitrophenyl), (p-chlorophenyl), 1-phenyl, and 1(p-methylphenyl) ) yields the appropriate 1-aryl-r-1,c-2,t-3,t-4-tetrachloro-1,2,3,4-tetrahydronaphthalene as the major product of addition. The 1H n.m.r. spectra of these compounds show …
-
Mechanistic Investigations and Synthetic Development of (-)-Sparteine Mediated Asymmetric Benzylic Lithiation-Substitution Reactions of Secondary Amides
The synthetic utility of the lithiation-substitutions of N-(2-phenethyl)isobutyramide has also been investigated. Enantioenriched substituted products have been carried forward in the synthesis of 1,4-disubstituted dihydro- and tetrahydroisoquinolines. Variation of either substituent is convenient …
-
Facile protein and amino acid substitution reactions and their characterization using thermal, mechanical and optical techniques
… objective was to quantify protein and amino acid substitution reactions. Michael addition reactions were used to modify the amino acids and protein. Amino acids alanine, cysteine, and lysine, and protein ovalbumin (OA) were substituted with different concentrations of ethyl vinyl sulfone (EVS). …
-
I. The Structure and Properties of Tetraalkyl-2-Tetrazenes. Ii. Some Substitution Reactions of Trimeric Phosphonitrilic Chloride
Made available in DSpace on 2015-05-12T17:02:36Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0025198.PDF: 6078695 bytes, checksum: f46da6de36a1f604b1ea82fb90d77546 (MD5) Previous issue date: 1957
-
Synthesis of ferrocenyl and 1-methylpyrrolyl bisphophines via electrophilic addition and substitution reactions of tungsten-coordinated phosphenium ions and phosphine triflates
… complexes were synthesized using electrophilic substitution reactions of tungsten pentcarbonyl-coordinated phosphenium ions [W(CO)5(PRRʹ)]+, phosphine triflates [W(CO)5{PRRʹ(OSO2CF3)}], [W(CO)5{PRCl(OSO2CF3)}] and protonated amino phosphine [W(CO)5{PCl2NH(Et)2}]+ (38) with N-methylpyrrole and …
-
Aspects of the chemistry of 1,4-naphthoquinones. An investigation of nucleophilic substitution reactions of alkylamines and hydroxyalyklamines on 1,4 napthoquinones and the role of solvent on the position of substitution.
Nucleophilic substitution reactions of alkylamines, cyclic alkylamines, and hydroxyalkylamines with 5-substituted-1,4-naphthoquinones have been studied. It has been found that the nature of the solvent employed in the reaction influences the position of mono-substitution at either the 2- or …
-
Mechanistic studies on iridium catalyzed allylic substitution
Mechanistic studies on iridium catalyzed allylic substitution reactions catalyzed by iridium phosphoramidite complexes revealed that the active catalyst is generated through a base assisted cyclometalation of the phosphoramidite to form five-membered iridacycle. A mechanism for the reaction was …
-
Base Catalysis of Ligand Substitution in Metal Carbonyls
Manganese(I) carbonyls can undergo substitution by a variety of mechanisms. Three different mechanisms have been found for the substitution reactions of Mn(CO)(,5)CH(,3)CN('+).
-
Intermolecular and intramolecular asymmetric induction at the beta-benzylic position of carboxamides in directed lithiation-substitution sequences
… of secondary carboxamides in directed lithiation-substitution reactions has been achieved intermolecularly by using ($-$)-sparteine as the external chiral ligand and intramolecularly by using $\alpha$-methylbenzylamine as the covalently attached chiral auxiliary.
-
Synthetic, Structural and Thermochemical Studies of N-Heterocyclic Carbene (NHC) and Tertiary Phosphine Ligands in the Ni(CO)2(L)x (L-PR3, NHC) Systems
… crystal X-ray diffraction. The enthalpy of substitution reactions of Ni(CO)2(NHC) (NHC = ItBu [N, N'-bis(tert-butylimidazol)-2-ylidene], IAd [N, N'-bis(1- adamentylimidazol)-2-ylidene]) with NHC and tertiary phosphine ligands leading to the formation of Ni(CO)2(L)2 (L = NHC, PR3) complexes …
-
An investigation into the active sites in co-reactants for carbonless copying paper
… materials in catalysing inorganic ligand substitution reactions. Activated aluminas are shown to outperform acid activated clays as developers for CVL, with the effectiveness increasing with activation temperature up to 500°C. In addition, unlike the acid activated clays, no shift in the …
-
Recent advances in copper- and palladium-catalyzed carbon-heteroatom and carbon-carbon bond-formation
Metal-catalyzed nucleophilic substitution reactions of aryl halides have become one of the most valuable and useful classes of reactions developed in the last 30 years. Foremost among these processes are the classes of palladium- and copper-catalyzed reactions, which employ heteroatom-based …
Page 1 of 4