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立體選擇性立體化學術語。 當一個反應生成A, B兩個立體異構體,而A產量比B多的時候稱相應的反應具有立體選擇性。典型的立體選擇性反應,比如有維蒂希反應Horner-Wadsworth-Emmons反應羥醛反應等等。

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