Phosphine coordination complexes of the diphenylphosphenium cation: a versatile synthetic methodology for P-P bond formation.
A series of phosphine-diphenylphosphenium donor-acceptor cationic complexes have been synthesized and comprehensively characterized (phosphine = diphenylchlorophosphine, triphenylphosphine, trimethylphosphine, and tricyclohexylphosphine). The complexes involve homoatomic P-P coordinate bonds that are susceptible to ligand exchange reactions highlighting a versatile new synthetic method for P-P bond formation. Phosphenium complexes of 1,2-bis(diphenylphosphino)benzene and 1,2-bis(tert-butylphosphino)benzene undergo unusual rearrangements to give a "segregated" diphosphine-phosphonium cation and a cyclic di(phosphino)phosphonium cation, respectively. The rearrangement products reveal the kinetic stability of the phosphine-phosphenium bonding arrangement.
Burford
Neil
N
Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada, B3H 4J3. Neil.Burford@dal.ca
Ragogna
Paul J
PJ
McDonald
Robert
R
Ferguson
Michael J
MJ