Krief-Reich synthesis

Mediods for overcoming these difficulties include the reaction in Scheme 64 and the corresponding Julia (Scheme 76) or Krief-Reich alkene syntheses, which are all selective for the synthesis of ( )-allylsilanes. These methods use phosphorus, sulfur or selenium as the electrofugal group another possibility is to use electrofugal carbon in a decarboxylative elimination, which can be carried out stereospecifically either anti or syn (Scheme 77). ... 

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