Olefin complexes of rhodium(I) containing the ligands but-3-enyldiphenylphosphine and diphenylpent-4-enylphosphine

Abstract

But-3-enyldiphenylphosphine (mbp) and diphenylpent-4-enylphosphine (mpp) react with Rh 2Cl 2(C 2H 4) 4 (molar ratio 2 1 to form the four coordinate dimeric complexes Rh 2Cl 2(mbp) 2 and Rh 2Cl 2(mpp) 2 respectively, while but-3-enyldiphenylphosphine reacts with Rh 2Cl 2(C 2H 4) 4 (molar ratio 4 1 ) to form RhCl(mbp) 2, a five coordinate complex in the solid state. The dimers further react with sodium tetraphenylborate to give the π-bonded tetraphenylborate complexes Rh[mbp][C 6H 5) 4B] and Rh[ i-mpp][(C 6H 5) 4B] where i-mpp = (C 6H 5) 2P(CH 2CH 2CHCHCH 3). RhCl(CO)(mbp) 2 reacts with sodium tetraphenylborate to form the five coordinate cationic complex [Rh(CO)(mbp) 2][(C 6H 5) 4B]. Both RhCl(CO)(mbp) 2 and RhCl(mbp) 2 react with hydrogen in methanol saturating the olefin to form RhCl[CO][(C 6H 5) 2P(C 4H 9)] 2 and Rh 2Cl 2[(C 6H 5) 2P(C 4H 9)] 2 respectively.