Phenylbis(2-pyridyl)phosphine: P-vs. N,N'-coordination in carbonylmolybdenum-(0) and -(II) complexes

Article abstract of DOI:10.1016/0022-328X(93)80150-A

The first carbonyl molybdenum-(0) and -(II) complexes with phenylbis(2-pyridyl)phosphine (PPhpy2) have been synthesized.PPhpy2 reacts with to give .With (NBD = norbornadiene) it gives when a 2:1 ratio is used, or for a 1:1 ratio.Decarbonylation of any of these pyridylphosphine complex leads to an oligomer of formula n, which is also obtained alter heating in solution with an equimolar amount of PPhpy2.The oligomer undergoes oxidative additionby iodine or allylbromide to give , or 3-CH2CHCH2)(CO)2(py2PhP,N,N')>, respectively.These complexes are also obtained by addition of equimolar amounts of PPhpy2 to solutions of and MoBr(η³-CH2CHCH2)(CO)2(NCMe)2, respectively.The ligand tends to act as a P-donor towards molybdenum(0) substrates, and as a chelating N,N'-donor in molybdenum(II) complexes.