Treatment of a carbonate ester of 2,2,2-trichloroethanol
derivative with CrCl2–DMF in THF gives a
β-carbonate-coordinated geminal dichromium species, which adds to an
aldehyde and eliminates an acyloxychromium group to afford a
(Z)-2-chloroalk-2-en-1-ol stereoselectively.
用
四氢呋喃中的 CrCl2-
DMF 处理
2,2,2-三氯乙醇衍
生物的
碳酸酯,可得到β-
碳酸酯配位的宝石色二氢
铬,它与醛相加并消除酰氧基
铬基,从而立体选择性地得到 (Z)-2-chloroalk-2-en-1-ol 。