Hindered rotation and electronic distribution in thiocarbamates

We wish to report here the isolation of methyl N-(p-methoxybenzyl)thiocarbamate, a natural product extracted from Pentadiplandra brazzena Bailli, and the synthesis of its homologue, benzyl N-(2-phenylethyl)thiocarbamate. The barrier to internal rotation calculated from a complete lineshape analysis of the temperature dependent ¹H n.m.r. spectra is discussed. The extent of delocalization on the three N, S and O substituents on the central trigonal carbon atom is gauged from a double labelling experiment.     

A study of the reactions KN→Σ(1385)π between 0.6 and 1.2 GeV/c

An energy-dependent partial-wave analysis of the reaction $\text{K}\text{N}\text{→Σ(1385)π}$ has been performed in the energy region lying between 1.65 and 1.85 GeV. The resonant amplitudes of seven well known Y¹ resonances have been determined, and used to compute the corresponding (8) ? (10) SU (3) coupling constants.     

Stereochimie de la reaction de rupture par le brome de la liaision siliciumaryle du dimethyl-1,2 phenyl-1 silacyclopentane

Stereospecific synthesis of geometric isomers of 1,2-dimethyl-1-phenylsilacyclopentane is described. We demonstrate that brominolysis of the arylsilicon bond occurs with predominant inversion of configuration at the silicon atom of the silacyclopentane ring.     

Etudes stereochimiques dans la serie du silacyclopentane: synthese de dimethyl-1,2 alcoxy-1 silacyclopentanes a stereoisomere preferentiel

The stereoselective alcoholysis of 1,2-dimethyl-1-chlorosilacyclopentane and the catalytic alcoholysis of 1,2-dimethylsilacyclopentane are described.