M. Lewin, Zeev Ainzenshtat, J. Blum
Jan 15, 1980
Citations
0
Influential Citations
12
Citations
Journal
Journal of Organometallic Chemistry
Abstract
Abstract Chlorotris(triphenylphosphine)rhodium, RhCl(PPh 3 ) 3 undergoes thermal decomposition above 140°C in solution and in the solid state to yield biphenyl. Rhodium complexes with para -substituted triphenylphosphine ligands form exclusively 4,4′-disubstituted biphenyls. Mixtures of two complexes RhCl(PAr 3 ) 3 and RhCl(PAr′ 3 ) 3 form the crossed diaryl ArAr′ and two non-crossed compounds (Ar) 2 and (Ar′) 2 . The mechanism is assumed to involve dissociation of RhCl(PPh 3 ) 3 into PPh 3 and solvated RhCl(Pph 3 ) 2 followed by oxidative addition of the liberated phosphine to the latter bis-triphenylphosphine compound. Evidence for a phenyl-rhodium intermediate has been provided by phenylation of styrene by RhCl(PPh 3 ) 3 . In an independent process, RhCl(PPh 3 ) 3 forms benzene by an ortho -metallation route.