Reactions of coordinated dinitrogen. 7. Preparation and characterization of molybdenum bis(dinitrogen) complexes containing mixed tertiary phosphine ligands

Abstract

285perature. After filtration and washing, pure K[(q5-C5H5)-Fe(C0)2] is obtained as a solvent-free, free-flowing solid in 7 5 4 0 % yield. No evidence for the presence of other, more highly reduced species was found.(CO)2]2. 12154-95-9; potassium benzophenone ketyl, 19333-28-9; benzophenone, 119-61-9.

Molybdenum(0) Dinitrogen Complexes Supported by Pentadentate Tetrapodal Phosphine Ligands: Structure, Synthesis, and Reactivity toward Acids

“…A similar tilt of the N 2 ligand is observed in the complex [MoN 2 (dpepp)­(dppm)] ( 19 ) {dpepp = bis­[(diphenylphosphino)­ethyl]­phenylphosphine}, − where, in contrast to the C 3 bridges present in 15 , the diphenylphosphine end groups of the trident ligand are connected via C 2 bridges to the axial P donor. In this case, the P eq –Mo–P ax angles are reduced to an average value of 80.15°, whereas in 15 , both of these angles are close to 90°.…”

Ancillary Ligand Effects on Carbon Dioxide-Ethylene Coupling at Zerovalent Molybdenum

“…10 Coordination of the tridentate ligands was accomplished by treatment with MoCl 3 (THF) 3 to afford the [(Ar 2 PCH 2 CH 2 ) 2 PPh]MoCl 3 (2to 7-Cl 3 ) complexes in good yields, analogous to the procedure previously employed for (Triphos)MoCl 3 (1-Cl 3 ). 11 These paramagnetic species were characterized by combustion analysis, 1 H NMR spectroscopy, and cyclic voltammetry. In some cases it was possible to discern the presence of both mer and fac isomers by NMR spectroscopy.…”

“…For synthetic convenience the aryl substituents on the terminal phosphines were selected for attenuation, and the ligands were prepared via radical or base-catalyzed coupling of divinylphenylphosphine and the corresponding diarylphosphine . Coordination of the tridentate ligands was accomplished by treatment with MoCl 3 (THF) 3 to afford the [(Ar 2 PCH 2 CH 2 ) 2 PPh]MoCl 3 ( 2- to 7-Cl 3 ) complexes in good yields, analogous to the procedure previously employed for (Triphos)MoCl 3 ( 1-Cl 3 ) . These paramagnetic species were characterized by combustion analysis, 1 H NMR spectroscopy, and cyclic voltammetry.…”

Mechanism of the decomposition reaction of trans-[Mo(N2)2(PPh2Me)4] and of its reaction with pyridine

“…suggest that the slow stage is associative, which makes doubtful the previous assignment of the slow and fast processes to k, and There is an alternative approximation which leads to a rate equation of the same mathematical form as that of (6) but different mechanistic meaning.' The curves were calculated as in Fig.…”