Isomerization of primary allylic alcohols proceeds in dichloromethane at 25 °C in the presence of the catalyst prepared in situ from VO(acac)2 or MoO2(acac)2, and Me3SiOOSiMe3 to give tertiary isomers in good yields. The catalysts are also effective for the rearrangements of sec.→tert. allylic alcohols. The isomerization of an allenyl allylic alcohol, 6-methyl-1,2,5-heptatrien-4-ol, gives either (E)-2-methyl-3,5,6-heptatrien-2-ol or (E)-6-methyl-3,5-heptadien-2-one selectively depending on the reaction conditions.
初级
烯丙醇的异构化在25 °C的
二氯甲烷中进行,使用现场制备的催化剂(VO(acac)2或
MoO2(acac)2,和Me3SiOOSiMe3),能够高产率地生成三级异构体。这些催化剂在二次
烯丙醇转化为三级
烯丙醇的重排反应中也表现出良好的活性。对于烯炔
烯丙醇6-甲基-1,2,5-七烯-4-醇的异构化,则根据反应条件的不同,可以选择性地产生(E)-2-甲基-3,5,6-七烯-2-醇或(E)-6-甲基-3,5-七烯-2-酮。