試題詳解

41. What is the best reagent for the following transformation?  
(A) 1. PhMgBr, ether 2. H₃O 
(B) PhCH₂MgBr, ether 2. H₃O 
(C) Ph₃P=CHPh, THF 
(D) (PhCH₂)₂CuLi 
(E) All of the above work well.