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Hydromagnesiation of alkynylsilanes 1 in diethyl ether gave ( Z)-α-silylvinyl Grignard reagents 2, which underwent a cross-coupling reaction with ( E)-α-iodovinyl sulfides 3 in the presence of Pd(PPh 3 ) 4 as catalyst to afford stereoselectively ( Z,Z)-2-silyl-3-arylsulfanyl-substituted 1,3-dienes 4 in good yields.
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Zhang et al. (2008) studied this question.
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