Reaction of Grignard reagents with methyl 3-acetoxy-2-methylenealkanoates produces (2E)-2-substituted alk-2-enoates, whereas a similar reaction with 3-acetoxy-2-methylenealkanenitriles provides (2Z)-2-substituted alk-2-enenitriles in high (Z)-stereoselectivity.
格氏试剂与 3-乙酰氧基-2-亚甲基烷酸甲酯反应生成(2E)-2-取代的烷-2-烯酸酯,而与 3-乙酰氧基-2-亚甲基烷腈的类似反应则以高(Z)-全选择性生成(2Z)-2-取代的烷-2-烯腈。