Promotion of phosphaalkyne cyclooligomerisation by a Sb(v) to Sb(iii) redox process.
A high yield of the tetraphosphaladderene, anti-tetraphosphatricyclo[188.8.131.52(2,5)]octa-3,7-diene, is obtained from reaction of the zirconocene 1,3-diphosphabicyclo[1.1.0]butane with Ph(2)SbCl(3) in THF or CH(2)Cl(2). Exploration of the reaction pathway using density functional theory suggests that an envelope-type adduct of Ph(2)SbCl 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 simultaneous...Expand abstract
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