1,3,5,7‐Tetraphosphabarrelene: A New Cyclic Phosphaalkyne Tetramer

Abstract

A surprisingly straightforward cyclotetramerization of tBuC ≡ P in the coordination sphere of an η8-cyclooctatertraene–zirconium complex yields 1,3,5,7-tetraphosphabarrelen 1. The bicyclic compound is initially bound to the Zr atom through two PC bonds, but can easily be liberated from the complex by reaction with hexachloroethane.