試題詳解

23. Which of the following Wittig reagents would be useful for converting R2C=O into R2CHCHO after hydrolysis?
(A) Ph₃P=CHOCH₃
(B) Ph₃P=CHCH₃
(C) Ph₃P=Cl₂
(D) Ph₃P=CHCH=CH₂
(E) Ph₃P=C(OCH₃)₂