Synthesis and NMR spectroscopy of cyclopalladated tertiary phosphite complexes. X-ray crystal structure of Pd(.eta.5-C5H5)[P(OPh)2(OC6H4)]

Novel phosphite palladium complexes and their application in C–P cross-coupling reactions

“…31 P NMR spectra in CDCl 3 at 25 C showed complex 2 to be a mixture of cis-and trans-isomers, as was also reported for other ortho-palladated complexes [4,5,14]. Both 31 P and 1 H NMR spectra showed rather broad peaks at 25 C, which could be due to the facile interchange of cis-and trans-isomers and the conformational flexibility of the seven-member ring in the phosphite ligand at room temperature [4d].…”

“…It is worth pointing out that other small size phosphite ligands, such as triphenylphosphite, do not yield ortho-metallated complexes under the same reaction conditions [4d,14]. 13 C NMR analysis showed a signal at d 150.1 ppm, which is very typical for the C ipso of CePd s-bonds in ortho-metallated complexes [4,5,14].…”

Monomeric triphenylphosphite palladacycles with N-imidazole ligands as catalysts of Suzuki–Miyaura and Sonogashira reactions

“…Dimeric triarylphosphite-based palladacycles have been obtained in the reaction of PdCl 2 with P(OR) 3 or, alternatively, with PdCl 2 [P(OR) 3 ] 2 [1e3]. These complexes are active catalysts of SuzukieMiyaura [1,4,5], Hiyama [6], Stille [1], Sonogashira [6], Heck [7] reactions and in the allylation of aldehydes with allyl tributyltin [8].…”

Structure of (η5-cyclopentadienyl)bis(dimethylphenylphosphine)palladium(II) perchlorate

“…The origin of these distortions is not yet fully understood (Albinati, Affolter & Pregosin, 1990). Several palladium(II) complexes of this type have been characterized crystallographically and shown to adopt an eclipsed conformation.…”