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（±）4，10-二氧杂三环［5，2，1，02，6］-癸-8-烯-3-醇在ZnBr2催化下与格氏试剂反应得S－二醇4a，而与街进制AT（OPr-i）3单独作用则得R－H醇4b。探讨了反应机理，并提出了合成不同构型乳醇的新方法。
(±) 4,10-dioxa-tricyclo [5,2,1,02,6] -dec-8-en-3-ol is reacted with Grignard reagent under ZnBr2 catalysis to obtain S-diol 4a, while R-H alcohol 4b is obtained by acting alone with the AT (OPr-i) 3. The reaction mechanism was discussed, and a new method of synthesizing different configurations of lactols was proposed.