Heterocyclic sulfides and thiols react with Grignard reagents in the presence of NiCl2(Ph2PCH2CH2CH2PPh2) to afford the cross-coupling products in high yields. The reaction of 2,2′-dipyridyl disulfide with 3-phenylpropylmagnesium bromide is also described.
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Takei et al. (1979) studied this question.
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