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.

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統計： A(0), B(0), C(25), D(4), E(0) #941865

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