Stable Iso-osmabenzenes from a Formal [3+3] Cycloaddition Reaction of Metal Vinylidene with Alkynols

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION , 50 , 6, 1354-1358, Publication Date : 2011

Author: Qianyi Zhao, Lei Gong, Chunfa Xu, Jun Zhu,* Xumin He, and Haiping Xia*

Abstract：

The magic of Os: An unprecedented formal [3+3] cycloaddition reaction of 1 with alkynols affords stable iso-osmabenzenes at room temperature (see scheme). The phosphonium substituent at the Cβ position and the 18e− nature of the compound play key roles in the origin of the high thermal stability of the products. Isomerization of iso-osmabenzenes into η5-cyclopentadienyl complexes through metalated cyclopentadiene intermediates is also described.

http://onlinelibrary.wiley.com/doi/10.1002/anie.201006442/pdf