New aryl phosphinite ligands avoiding ortho-metallation: Synthesis and molecular structures of trans-[PdCl2(PPh2OR)2] and trans-[Rh(CO)Cl(PPh₂OR) ₂] (R = 2,4,6-Me₃C₆H₂; 2,6-Ph₂C₆H₃)

摘要

The new aryl phosphinites PPh2OR (R = 2,4,6-MeCH, ; R = 2,6-PhCH, ) have been prepared from chlorodiphenylphosphine and the corresponding phenols. In these ligands, the -positions of the aromatic phosphite function are blocked by methyl and phenyl substituents, which allows coordination to metal centres without -metallation. Thus, reaction with [PdCl (cod)] leads to the complexes -[PdCl (PPhOR)] (R = 2,4,6-MeCH, ; R = 2,6-PhCH, ), while the reaction with [Rh (CO)Cl] gives -[Rh(CO)Cl(PPhOR)2] (R = 2,4,6-MeCH, ; R = 2,6-PhCH, ). The single-crystal X-ray structure analyses of and confirm the trans-coordination of the new ligands in these square-planar complexes.