Chelated palladium and platinum complexes of diphosphinite ligands, ch₂(o-c₆h₄opph₂)₂ and ph₂po(ch₂)₃opph₂: characterization and catalytic activity

GRAPHICAL ABSTRACT

Abstract

The novel 10-membered chelated metal complexes have been synthesized by the reaction of known ligand 1, CH₂(o-C₆H₄OPPh₂)₂, and 2, PPh₂O(CH₂)₃OPPh₂, with starting complexes, MCl₂COD[M = Pd (1a, 2a), Pt (1b, 2b)]. The characterization of new complexes has been performed by utilizing ³¹P{¹H}-NMR, ¹³C{¹H}-NMR, ¹H-NMR, and FT-IR spectroscopic methods and elemental analysis. Also, the structures of complexes 1a and 1b have been determined by X-ray crystallography. Complexes 2a and 2b turned into dimer structures (2a′ and 2b′) during the recrystallization process Complexes 1a and 2a are very effective catalysts in the Suzuki–Miyaura C‒C cross-coupling reactions of aryl bromide with phenylboronic acid.

Keywords:

• Tridentate phosphorus ligands
• diphosphinite ligands
• phosphinite complexes
• Suzuki–Miyaura cross–coupling reactions