Phosphirenes and Diphosphetenes: the Products of the Reaction of λ3-lminophosphines with 1-Alkoxy- and 1-Aminoalkynes

The reaction path in cycloaddition reactions of λ³-iminophosphines with alkoxy- and amino-alkynes depends on the type of starting compound and solvents employed and leads to the formation of phosphirenes or 1,2-diphosphetenes.