Transition metal complexes with bidentate ligands spanning trans-positions. Part XIV. Some complexes of 2,11-bis(diphenylphosphinomethyl)benzo[c]phenanthrene with platinum (0) and their reactivities

The ligand 2,11-bis(diphenylphosphinomethyl)benzoc]phenanthrene ( 1 ) has been used to prepare complexes of the type PtL( 1 )] (L ? C₂H₄, CH₂?CH? CO₂Me, PhC?CPh, MeC?CMe, MeO₂CC?CCO₂Me, (i-Pr)O₂CC?CCO₂(i-Pr), Ph₃P and CO). It is shown that these complexes are less labile than the corresponding species PtL(Ph₃P)₂]. The preparation of complexes trans-PtX(R)(1)] by oxidative addition of RX (RX ? PhCH₂Br and Mel) to Pt(C₂H₄)(1)] is described. The isolation of PtO₂(CH₃)₂CO(1)] is also reported.