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Now showing items 201-210 of 318
The synthesis and infrared spectra of some group VA chalcogenides
(1969)
The preparation of compounds having the general formula R₃MX, where R is an alkyl group, M is P, As or Sb and X is O, S, Se or Te has been carried put previously. The fundamental stretching frequency, ν[subscript S](M=X), ...
The utilization of phosphonic esters in the Knoevenagel condensation
(1969)
A study has been made of the kinetics of the Knoevenagel condensation, wherein phosphonlc esters have been employed as the active methylene compounds. The relative reactivities of each of the active methylene compounds ...
Organometallic polymers
(1979)
Potassium-graphite, a typical alkali metal-graphite intercalation compound, has been found to undergo reactions with organic substrates y both one-and two-electron processes. The reaction of weak protic acids like water ...
The development and application of multiconfigurational self-consistent field states to study the electronic structure of atoms and molecules
(1986)
We develop and review complete second-order Newton-Raphson type multiconfigurational self-consistent field (MCSCF) iterative procedures based on unitary exponential operators. We discuss characteristics that an MCSCF ...
Solid-state nuclear magnetic resonance studies of the reactions of olefins within zeolite catalysts
(1990)
Olefins are one of several classes of organic compounds which undergo acid-catalyzed reactions within acidic zeolite catalysts. Reactions of olefins are of considerable interest in heterogeneous catalysis since they ...
The selective functionalization of saturated hydrocarbons with GIF-type systems
(1992)
The Gif-family is a group of Fe- or Cu-containing chemical systems oxidizing saturated hydrocarbons to ketones. The unusual behavior shown by these systems (secondary C-H bonds are oxidized preferentially even in the ...
Conformational analysis of 1,3-Dioxole, 1,3-dioxolane, 1,3-dithiolane, and ehtyl nitrite
(1994)
The far-infrared and low-frequency Raman spectra of 1,3-Dioxole have been analyzed. The gas-phase far-infrared spectrum shows a series of eleven singlequantum- jump and three triple-quantum-jump transitions in the 40-330 ...
Synthesis and evaluation of the biological activity of analogues of pepstatin
(1980)
Synthesis of all four stereoisomers of the novel amino acid statine, 4-amino-3-hydroxy-6-methylhepatanoic acid, and alastatine, 4-amino-3-hydroxypentanoic acid has been accomplished. Several tripeptide analogues of pepstatin ...
[Sigma]-intermediates in the chemistry of nitrogen heterocycles
(1971)
Using nmr spectroscopy, stable σ-intermediates were detected in the reactions of organolithium compounds with pyridine and several substituted pyridines. In the reactions of phenyllithium with 3-picoline (or with ...
Oxygen complexes : reduction kinetics and other model studies
(1985)
An investigation of the relationship between the reduction potentials of ferrous chelates and the rate of reduction of oxygen adducts of cobaltous-polyamines is reported. Potentiometric equilibrium studies of 1:1 molar ...