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Abstract
Systems of the type (RS)nB[N(CH3)2]3-n with R = CH3 or C2H5 exist in equilibrium mixtures in which the presence of the unsym-metrical compounds with n = 1 or 2 can be demonstrated but the species cannot be isolated in pure state. Reactions and spectro-scopic data on such systems as well as on some ethylthio-phenyl-borane species are reported.