En Route to Archimedene: Total Synthesis of <i>C</i><sub>3</sub><i><sub>h</sub></i>-Symmetric [7]Phenylene
作者:Dirk Bruns、Hirokazu Miura、K. Peter C. Vollhardt、Amnon Stanger
DOI:10.1021/ol027482z
日期:2003.2.1
[reaction: see text] The totalsynthesis of C(3)(h)-symmetric [7]phenylene has been accomplished by triple cobalt-catalyzed cycloisomerization of an appropriate nonayne. Its spectral data are in accord with the expectations for a triply angularly fused system, but its calculated heat of formation suggests the presence of a destabilizing sigma effect relative to its D(3)(h) isomer. The molecule constitutes