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 10 of 10 for “"entropy of activation"”.
-
Dimethyl N-Aryl phosphoramidates : structural effects on bonding and solvolytic reactivity
The acid catalysed hydrolysis of a number of ring alkyl substituted dimethyl N-aryl phosphoramidates, (MeO)2P(0)NHAr, has been studied by measuring the rates of hyd~olysis with the aid of a UV spectrophotometer. These rates have been correlated with the pKa values of the corresponding ani I inium …
-
Mechanisms of Chemiluminescence
… was prepared by the base-catalyzed rearrangement of 4-bromo-3-hydroxy-3,5,5-trimethyl-1,2-dioxolane. Thermal decomposition of this dissymmetric dioxetane to acetone and methylglyoxal proceeds with an activation energy of 26.0 (+OR-) 1 kcal/mol and a log A of 14.2. The enthalpy of activation and …
-
Solvolysis of cobaltammines
The reactions studied were the aquaton of chloropentammine cobalt III chloride and the anation of aquopentanmine cobalt III ions with chloride ions in various e thanol—water rixtures. First order kinetics were observed for the aquation reaction being first order in cobalt concentration. The rate of …
-
The synthesis and thermal rearrangement of 2,5-Dialkyl-1,3,4- triphenyl-2,4-cyclopentadien-1-o1's
… to obtain information about the relative rates of the rearrangement. The rearrangement of the three 2, 5-dialkyl-1, 3, 4-triphenyl-2, 4-cyclopentadien-1-ols were studied kinetically and the results compared with those obtained from similar studies on …
-
Determination of the Activation Parameters of Reaction Between [Fe(CN<sub>6</sub>]<sup>-4</sup> and K[Co(HEDTA)NO<sub>2</sub>].
<p>The kinetics of the oxidation of [Fe(CN)<sub>6</sub>]<sup>-4</sup> by K[Co(HEDTA)NO<sub>2</sub>] was studied in order to get the mechanism and the activation parameters of the reaction. Using a freshly-made Na<sub>3</sub>PO<sub>4</sub> solution as the reaction medium with a pH of 6.00 the ionic …
-
The Interaction of Simple Gases with Hot Metal Filaments
The interaction of iodine, methyl bromide, methyl cyanide and methyl iodide with tantalum, tungsten, molybdenum and platinum filaments has been studied in a magnetron system. The interaction of two of these compounds, iodine and methyl iodide, with tantalum filaments has also been studied in an …
-
Indium complexes and their role in the ring-opening polymerization of lactide
The synthesis and characterization of a series of chiral indium complexes bearing a tridentate NNO ligand are reported. The ligand 2-[[[(dimethylamino)cyclohexyl]amino]methyl]- 4,6-bis(tert-butyl) phenol (H₂NNO) was synthesized via a previously published procedure and bound to indium by both a …
-
Modeling Peptide-binding Interactions and Polymer-binding Interactions and their Role in Mass Spectrometry
… the experimental data in order to obtain the 0 K activation energy and the entropy of activation. These thermodynamic data were then used to understand the competing dissociation channels observed (except for gas phase complexes involving glycine that had only one dissociation channel). Molecular …
-
Low-temperature protonation studies of an electron-poor osmium methyl complex, and molecular precursors for the construction of graphene nanostructues with atomically precise edge structures
Treatment of Cl2PCH2Cl2 with CF3SiMe3 in the presence of CsF promotor gave the cesium salt Cs[((CF3)2P)2CH], which was converted to the electron-poor diphosphine (CF3)2PCH2P(CF3)2 (dfmpm) by addition of ethereal hydrogen chloride. Treatment of (C5Me5)2Os2Br4 with excess dfmpm in the presence of …
-
Study of Synthesis, Reactions and Enantiomerization of C<sub>α</sub>-Chiral Grignard Reagents
The development of chiral organometallics for asymmetric synthesis is a topic of significant research in the recent past. The most studied in this class are the chiral organolithium reagents with many reported examples. The primary focus of our research is the development of C<sub>α</sub>-chiral …