Syntheses of the novel cage compounds P3Se3C3But3 and P3Se4C3But3 and an unusual insertion reaction of [PtCl2(PMe3)] into the Se–Se bond of the latter to give the six-coordinate Pt(iv) complex [PtCl2(PMe3)P3Se4C3 But3]

Abstract

The novel cage compounds P₃Se₃C₃Bu^t₃ and P₃Se₄C₃Bu^t₃ are formed (together with the 1,2,4-selenadiphosphole P₂SeC₂Bu^t₂) from the reaction of the phosphaalkyne Bu^tCP with selenium; the [PtCl₂(PMe₃)] fragment undergoes an unusual insertion reaction into the Se–Se bond of P₃Se₄C₃- Bu^t₃.