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The reaction between secondary Grignard reagents and alkylthioarenes or alkylthioalkenes in the presence of 1:1 nickel dichloride–triphenylphosphine causing the substitution of alkylthio-groups by hydrogen atoms, the nickel(0)-induced replacement of alkylthio-groups of the aforementioned sulphides by alkyl or aryl functions, and the observation of regiocontrol in the catalysed reactions of Grignard reagents with unsymmetrical 1,1-bis(alkylthio)alkenes have led to a scheme of general, regio-, and stereo-selective olefine synthesis.
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Wenkert et al. (1982) studied this question.
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