Synthesis and Properties of a Bismethano-bridged Bisdehydro[21]annulenone. Conformation in Solution and in the Crystalline State
作者:Hiroyuki Higuchi、Seiken Kiyoto、Chiaki Sakon、Naoki Hiraiwa、Kaori Asano、Juro Ojima、Katsuya Inoue、Gaku Yamamoto
DOI:10.1246/cl.1994.2291
日期:1994.12
A bismethano-bridged bisdehydro[21]annulenone, tricyclo[15.4.1.16,11]tricosa-6,8,10,12,15,17,19,21-octaene-2,4-diyn-14-one, was synthesized. X-ray crystallography reveals the syn orientation of the two methano bridges. Two conformers are present in solution in a 97:3 ratio, the major isomer being the one existing in the crystalline state. Paratropicity of this compound in CDCl3 and in CF3CO2D is discussed.
合成了一种双甲桥双脱氢[21]琥珀烯酮,即三环[15.4.1.16,11]三烯-6,8,10,12,15,17,19,21-辛烯-2,4-二炔-14-酮。X 射线晶体学显示了两个甲桥的同步取向。溶液中存在两种构象,比例为 97:3,主要的异构体是结晶状态下的构象。讨论了该化合物在 CDCl3 和 CF3CO2D 中的同向性。