Synthesis of Nonstabilized Phosphaalkynes by Vacuum Gas‐Solid HCl Elimination

Abstract

The choice of starting compound for the synthesis of the unstabilized phosphaalkynes 3 has proved to be the (dichloroalkyl)phosphanes 2 . They were formed by the reduction of the phosphonates 1 with AlHCl 2 and dehydrohalogenized over hot K 2 CO 3 (230–350°C) in the gas phase. The simple phosphaalkynes 3 are stable in THF at room temperature also—who would have expected that! R = H, Me, Et, n Bu, Me 3 Si. equation image