【摘要】 <正> β-环糊精(β-CD)是七个葡萄糖单元以α-1,4-糖苷键连成的锥形环状分子,此环中的空腔是疏水性的,因而象酶一样,可提供一个疏水的结合部位来和一些几何形状及大小合适的有机和无机分子形成包结络合物,由于被包结的底物或试剂分子是处于一个低介电常数的微环境中,以及在反应位置上的特殊有利等等,使得环糊精催化下的有机反更多还原

【Abstract】 The gas-solid bromination of biphenyl in the presence of β-cycled extrin has been studied. The experimental data indicated’ that the rate of consumption of biphenyl in the presence of β-cyclodextrin is ten times greater than that when no β-cyclodextrin is present.lt was found that this reaction has high para selectivity.更多还原