In the reaction of cis-2-alkenyltins (allylictins) towardaldehydes, unusual anti-homoallyl alcohols were selectively obtained when the substituent at the 2-position of the alkenyltin reagent was a bulky one such as a tert-butyl or trialkylsilyl group. This reaction is assumed to proceed via the inverse antiperiplanar acyclic transition state.
An Easy Access to Stereodefined 2-Pentenyltins by Partial Hydrogenation of 2,4-Pentadienyltins with Diazene
作者:Yutaka Nishigaichi、Noriyuki Ishida、Akio Takuwa
DOI:10.1246/bcsj.67.274
日期:1994.1
Tributyl-(2-pentenyl)tins were readily prepared in high yield by hydrogenation of tributyl-(2,4-pentadienyl)tins with diazene generated from 2,4,6-triisopropylbenzenesulfonohydrazide. The terminal double bond was selectively hydrogenated in the conjugated diene system. The stereochemistry of the internal double bond was completely retained.