Now showing items 21-30 of 79
Thermodynamics of thallium alkanoates VI. Thallium(I) n-heptanoate revisited
(Elsevier, 1989-04)
The heat capacity of thallium(I) n-heptanoate has been remeasured on a new sample on which the preparative procedures were modified to eliminate the 1-1 (salt+acid) complex (soap) in a previously studied sample. The ...
Mixed copper, zinc 2-amino benzylic organometallics as efficient reagents for the synthesis of heterocycles
(Elsevier, 1989)
The mixed copper, zinc benzylic organometallics 1a-1c react efficiently with various electrophiles. By the reaction with acyl chlorides, highly functionalized 2-substituted indoles are produced. The treatment of 1a with ...
Bovine testicular [beta]-galactosidase: Purification of enzyme fractions that exhibit high affinity for phosphomannosyl receptors
(Elsevier, 1989-11-01)
An improved method is described for the preparation of bovine testicular [beta]-galactosidase that allows the isolation of enzyme fractions that bind avidly to phosphomannosyl receptors. The procedure permits removal of a ...
Direct and replacement ion chromatography with potentiometric detection using a silver/silver bromide electrode
(Elsevier, 1989)
The use of Ag/AgX electrodes as potentiometric detectors in modern ion chromatography methods is re-examined. Contrary to previous reports, in both flow-injection and chromatographic experiments the Ag/AgBr electrode is ...
Molecular reaction kinetics inside channel pores: Delayed fluorescence of naphthalene in methanol
(Elsevier, 1989-05-26)
A one-dimensional, diffusion-controlled, reaction is followed in time by phosphorescence (monitoring reactant) and delayed fluorescence (monitoring product). The triplet (excited) naphthalene molecules move in a methanol ...
Low nanogram detection of nucleotides using fast atom bombardment-mass spectrometry
(Elsevier, 1989-04)
The effect of trimethylsilyl (TMS) derivatization on detection limits of mononucleotides in fast atom bombardment-mass spectrometry (FAB-MS) was examined. FAB-MS methods were developed to optimize sensitivity using adenosine ...
Ab initio force fields of glycine dipeptide in C5 and C7 conformations
(Elsevier, 1989-02)
Schafer and coworkers have previously derived, with the 4-21 Gaussian basis set ab initio optimized geometries for the glycine dipeptide, CH3CONHCH2CONHCH3, in several conformations. Using their geometries for the C5 and ...
An unusual reductive ring-opening of the 1,2,3,5,6,7-hexaazaacenaphthylene ring system
(Elsevier, 1989)
Studies on an unexpected reaction involving a reductive cleavage of the pyridazine moiety of a tricyclic heterocycle are described. Structure assignments for the products obtained from the reductive cleavage were made using ...
The reactivity of the highly functionalized copper, zinc reagents RCu(CN)ZnI toward 1-haloalkynes and acetylenic esters
(Elsevier, 1989)
The highly functionalized organometallics RCu(CN)ZnI 1 react efficiently with 1-haloalkynes providing polyfunctionalized alkynes in high yields. This method has been used to prepare a pheromone of the Amathes c-nigrum in ...
Replacement ion chromatography with potentiometric detection using a potassium-selective membrane electrode
(Elsevier, 1989)
The use of a simple potassium-selective membrane electrode as a detector in replacement ion chromatography of both cations and anions is examined. For cation chromatography, separated alkali metal ions are detected in the ...