Synthesis of phosphapropyne by flash thermolysis of 1-vinylphosphirane or divinylphosphine

Abstract

The thermolysis of 1-vinylphosphirane 5 at 700°C yields phosphapropyne 7; owing to the existence of an equilibrium between divinylphosphine 6 and 1-vinylphosphirane above 500°C, the same phosphapropyne is also obtained by thermolysis of divinylphosphine.