Functionalised mixed alkyl(trimethylsilylmethyl)zinc reagents add effi
ciently to a wide variety of Michael accepters in high yield and with
exclusive 1,4-regioselectivity, without the need for transition metal
catalysis. The trimethylsilylmethyl group behaves as a nontransferable
group, and in no cases was transfer of this group observed. (C) 1998
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