Quantitative ortho-cycloboronation of P-phenyl groups in metallaborane chemistry and the crystal and molecular structure of the novel iso-closo-ten-vertex metallaborane [1,1,1-H(PPh3)(Ph2P-ortho-C6H4)-iso-closo-(1-IrB9H8-2-)]

Abstract

High-yield ortho-cycloboronation reactions of P-phenyl groups on phosphine ligands in iridadecaboranes accompany both nido cluster expansion and nido→close cluster closing processes that are associated with changes in the formal oxidation state of the metal atom; one of the products has a novel iso-closo-ten-vertex iridium (V)netallaborane cluster structure of idealized C_3vsymmetry (lrB₃B₃B₃).