Dynamic NMR Study of the Rotation around “Biphenyl-Type” Bonds in Polycyclic Sulfoxides
作者:Samuel Braverman、Yossi Zafrani、Hugo E. Gottlieb
DOI:10.1021/jo010947z
日期:2002.5.1
on the synthesis and the products of both symmetrical and asymmetrical starting materials. We also measure, by NMR techniques, the rotation rate of the side chain for several such polycyclic sulfoxides. The barriers for this process, which is similar to a biphenyl rotation, are very strongly dependent on the nature of the substrate, ranging between <7 and 21.0 kcal.mol(-1) for sulfoxides with two five-membered