Now showing items 431-440 of 479
Transmetallation of n-(trialkylstannyl)methylimines. A new method for the generation and cycloaddition of 2-azaallyl anions.
(Elsevier, 1988)
Transmetallation of imines 1 at -78[deg] with RLi provided 2-azaallyl anions 2, which readily undergo cycloaddition with olefinic anionophiles, providing pyrrolidines. Of particular note is the generation of unstabilized ...
The kinetics of water exchange across the chloroplast membrane
(Elsevier, 1980-08-05)
The kinetics of water exchange across the membrane of class II chloroplasts has been studied by two NMR methods. Both methods utilize Dy(en)3+ (en = ethylenediamine) to induce a transmembranal chemical shift the order of ...
A convenient synthesis of -(5'-deoxy-5'-adenosyl)- (+/-) -2-methylhomocysteine
(Elsevier, 1985)
The synthesis of -(5'-deoxy-5'-adenosyl)-+-2-methylhomocysteine in two steps from +--2-methylmethionine is described.
Rapid reductive-carboxylation of secondary amines. One pot synthesis of tertiary N-methylated amines
(Elsevier, 1985)
Various tertiary N-methylated amines were synthesized by using a new reductive-carboxylation approach. Secondary amines, on carboxylation with carbon dioxide under moderate reaction conditions, afforded their corresponding ...
Effects of anharmonicity of molecular vibrations on the diffraction of electrons : Part V. Tetrahedral molecules
(Elsevier, 1984-05)
Unless the skewing of radial distribution peaks is properly taken into account, diffraction analyses of gas molecules may lead to geometrically inconsistent arrays of internuclear distances. It is shown how to derive the ...
Carbon monoxide oxidation under transient conditions: A fourier-transform infrared transmission spectroscopy study
(Elsevier, 1985-07)
In contrast to the apparent simplicity of the overall reaction, oxidation of CO over Pt/A2O3 is known to present complex behavior. Self-sustained oscillations, hysteresis loops in conversion, and enormous rate enhancements ...
The microwave spectrum and structure of allyl alcohol
(Elsevier, 1987-11-16)
The microwave spectrum of the normal species of the gauche, gauche isomer of allyl alcohol has been reassigned and rotational and centrifugal distortion constants have been determined. Rotational constants of nine deuterated ...
Dimerization occurs during the reversible acid inactivation of 2-oxo-4-hydroxyglutarate aldolase from Escherichia coli
(Elsevier, 1983-11-28)
Exposure of Escherichia coli 2-oxo-4-hydroxyglutarate aldolase (4-hydroxy-2-oxoglutarate glyoxylate-lyase, EC 4.1.3.16) (molecular WEIGHT = 63000) to phosphoric acid at pH 1.6 for 10 min at 4[delta]C causes 95% or greater ...
Induction of tyrosine aminotransferase and amino acid transport in rat hepatoma cells by insulin and the insulin-like growth factor, multiplication-stimulating activity : Mediation by insulin and multiplication-stimulating activity receptors
(Elsevier, 1980-10-01)
Insulin stimulates a 2-fold increase in the amount of tyrosine aminotransferase and a 5-10-fold increase in the rate of amino acid transport in dexamethasone-treated rat hepatoma cells. In order to determine whether these ...
ZrTe5 and HfTe5: The heat capacity and derived thermophysical properties from 6 to 350 K
(Elsevier, 1989-07)
The heat capacities of ZrTe5 and HfTe5 have been measured by adiabatic shield calorimetry from 6 to 350 K on samples carefully shielded to minimize the contact between the sample and oxygen during all stages of preparation ...