Photochemical formation of [4.4.4](1,3,5)cyclophanes from 1,3,5-tris(3-phenylpropenoyl)benzenes
作者:Herbert Meier、Elena Karpouk
DOI:10.1016/j.tetlet.2004.04.048
日期:2004.5
Abstract Irradiation of 1,3,5-tris(3-phenylpropenoyl)benzene ( 1a ) yields in solution a dimer 2a by a threefold head-to-head/ anti [2π+2π]cycloaddition. The stereochemistry of this [4.4.4](1,3,5)cyclophane was determined by 1 H and 13 C NMR studies including NOE measurements and a calculation of the AA′MM′ spin pattern of the methine protons. In contrast to the solution photochemistry, which is presumably
摘要 1,3,5-三(3-苯基丙烯酰基)苯(1a)的辐照在溶液中通过三重头对头/反[2π+2π]环加成反应生成二聚体2a。该 [4.4.4](1,3,5) 环烷的立体化学通过 1 H 和 13 C NMR 研究确定,包括 NOE 测量和次甲基质子的 AA'MM' 自旋模式的计算。与可能受准分子排列控制的溶液光化学相反,结晶状态下的辐照通过拓扑化学控制导致二聚体 3a,其包含单个四元环。