Adducts of the Parent Boraphosphaketene H₂BPCO and their Decarbonylative Insertion Chemistry

Abstract

Abstract The first examples of Lewis base adducts of the parent boraphosphaketene (H 2 B‐PCO) and their cyclodimers are prepared. One of these adducts is shown to undergo mild decarbonylation and phosphinidene insertion into a B−C bond of a borole, forming very rare examples of 1,2‐phosphaborinines, B/P isosteres of benzene. The strong donor properties of these 1,2‐phosphaborinines are confirmed by the synthesis of their π complexes with the Group 6 metals.