36100-16-0Relevant academic research and scientific papers
Syntheses, structures and catalytic activities of molybdenum carbonyl complexes based on pyridine-imine ligands
Li, Chen,Ma, Zhihong,Li, Suzhen,Han, Zhangang,Zheng, Xuezhong,Lin, Jin
, p. 193 - 199 (2018)
Thermal treatment of pyridine imines [C5H4N-2-C(H)=N-C6H4-R] [R?=?H (1), CH3 (2), OMe (3), CF3 (4), Cl (5), Br (6)] with Mo(CO)6 in refluxing toluene provided six novel mononuclear molybdenum carbonyl complexes of the type [(η2-2-C5H4N)CH=N(C6H4-4-R)]Mo(CO)4 [R?=?H (7); CH3 (8); OMe (9); CF3 (10); Cl (11); Br (12)]. All of these complexes were separated by chromatography and fully characterized by elemental analysis, IR, and NMR spectroscopy. The crystal structures of complexes 7, 8 and 10 were determined by X-ray crystal diffraction analysis. In addition, the catalytic performance of these complexes was also tested, and it was found that these complexes had obvious catalytic activity on Friedel–Crafts reactions of aromatic compounds with a variety of acylation reagents.
Kinetics and Mechanism of Ring Closure for a Series of Photoproduced Intermediates (M = Cr, Mo, or W; L = Pyridine 2-Carbaldehyde Imine Ligand)
Chan, Lisa,Lees, Alistair J.
, p. 513 - 518 (2007/10/02)
Light irradiation of a solution of (M = Cr, Mo, or W) in the presence of a pyridine 2-carbaldehyde imine ligand 2-C5H4NCHNR (L; R = Ph, But, Bun, or Pri) produced a transient complex , in which the normally bidentate ligand is co-ordinated in a monodentate fashion.The photoproduced complex complex subsequently extrudes CO thermally to form a bidentate product ; this process is relatively slow and its time-dependent behaviour has been monitored with a diode-array u.v.-visible spectrophotometer for each of the ligands L.Kinetic data obtained for these chelation reactions indicate that the pyridine nitrogen atom in L preferentially scavenges the photoproduced intermediate.Rate and activation energy parameters closely relate to the nature of the ligand L and imply varying degrees of associative character in the ring-closure transition state.
