Promotion of phosphaalkyne cyclooligomerisation by a Sb(v) to Sb(iii) redox process
作者:Cheryl Fish、Michael Green、Richard J. Kilby、John E. McGrady、Dimitrios A. Pantazis、Christopher A. Russell
DOI:10.1039/b804401e
日期:——
A high yield of the tetraphosphaladderene, anti-tetraphosphatricyclo[4.2.0.02,5]octa-3,7-diene, is obtained from reaction of the zirconocene 1,3-diphosphabicyclo[1.1.0]butane with Ph2SbCl3 in THF or CH2Cl2. Exploration of the reaction pathway using density functional theory suggests that an envelope-type adduct of Ph2SbCl and 1,3-diphosphabicyclo[1.1.0]butane plays a pivotal role in the reaction. The zwitterionic character of this intermediate species allows it to act simultaneously as both an ene and an eneophile, and a symmetry-allowed bimolecular reaction leads to the tetraphosphaladderene species via a spirocyclic intermediate.
锆烯 1,3-二磷酸二环[1.1.0]丁烷与 Ph2SbCl3 在 THF 或 CH2Cl2 中反应生成了高产率的反四磷杂环[4.2.0.02,5]辛-3,7-二烯(anti-tetraphosphatricyclo[4.2.0.02,5]octa-3,7-diene)。利用密度泛函理论对反应途径的探索表明,Ph2SbCl 和 1,3-二磷杂双环[1.1.0]丁烷的包络型加合物在反应中起着关键作用。这种中间产物的齐聚物特性使其可以同时作为亲烯和亲烯体,对称性允许的双分子反应通过一个螺环中间产物生成四磷杂膀胱烯产物。