Sterically crowded cyclohexanes-2 synthesis, structure and dynamics of hexaspiro[2.0.3.0.2.0.3.0.2.0.3.0]heneicosane
作者:LutzFitjer、Ulrich Klages、Walter Kuhn、David S. Stephenson、Gerhard Binsch、Mathias Noltemeyer、Ernst Egert、George M. Sheldrick
DOI:10.1016/s0040-4020(01)98808-8
日期:——
The synthesis, structure and dynamics of hexaspiro[2.0.3.0.2.0.3.0.- 2.0.3.0]heneicosane are described. adopts a chair conformation in the crystal state but prefers a chair-to-twistboat equilibrium in solution. The activation parameters of the chair-to-chair interconversion of and the closely related hexaspiro[2.0.2.0.2.0.2.0.2.0.2.0]- octadecane ([6]rotane) have been determined by DNMR. Some consequences