Synthesis p. 465 - 469 (1991)
Update date:2022-08-04
Topics:
Jaeger
(S)-(+)-N,N'-Dicyclohexyl-O-(1-methylheptyl)isourea [(S)-2] reacts with acetic acid in cyclohexane to give (R)-(-)-(1-methylheptyl) acetate [(R)-3] with 100% inversion of configuration. Reaction of isourea (R)-2 with phenol proceeds also with inversion of configuration (99.8%) yielding (S)-(+)-(1-methylheptyl) phenyl ether [(S)-4] as the main product; optically active 2- and 4-(1-methylheptyl)phenols [(S)-5] and [(S)-6], respectively, are formed simultaneously. These byproducts, besides others resulting from hydride-shifts, document that the mechanism proceeds via the methylheptyl cation intermediate.
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