問題詳情

19. Which of the following is least likely to undergo a smooth crossed Claisen condensation with methyl pentanoate?
(A) (CH3)3CCO2CH3
(B) PhCH2CO2CH3
(C) PhCO2CH3
(D) HCO2CH3
(E) (CH3O)2CO

參考答案

答案：B
難度：適中0.666667
統計：A(0),B(2),C(0),D(0),E(1)