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

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統計： A(4), B(9), C(3), D(0), E(3) #1026904

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B1 · 2025/12/10

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這是一個關於克萊森酯縮合反應 (Clai...

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