however, this reaction requires an inert atmosphere. While W(CO)6 reacts rapidly with amines to give cis diamine adducts in high yields, direct reactions with phosphines are not so clean. Bis(phosphine) complexes are, however, cleanly formed when a small amount of piperidine is added to the reaction mixture, presumably via the bis(piperidine) complex cis-[W(CO)4(pip)2]. Reactions with Cr(CO)6 generally
synthesis of the complexes [M(CO)2(dppe)(Pr3)(NO)][BF4] (M Mo, W, PR3 PMe3PMe2Ph) and [M(CO)(NCMe)(dppe)(PR3)(NO)][BF4] (PR3 PMe2Ph, PPH3, P(OPh)3). The reaction of [Mo(CO)2(NCMe)(dppe)(NO)][BF]4] with NaS(o--C6H4Me yields the neutral complex [Mo(S(o-C6H4Me))(CO)2(dppe)(NO)]. The crystalstructure of [Mo(CCnPr)(CO2(dppe(NO)] has been determined by X-ray diffraction methods. The Mo atom displays
the metal (n⪖2) are necessary to obtain stable hydrido-silyl complexes of the type (CO)5-n(R′3P)nM(H)SiR3 (M = Cr, Mo, W). The complexes (CO)3(dppe)M(H)SiR3 and (CO)2(tdppme)M(H)SiR3 are obtained either by photochemical reaction of (CO)4(dppe)M or (CO)3(tdppme)M, or by thermal reaction of (CO)4(dppe)M(THF) with silanes HSiR3. Reaction of the isonitrile complexes (CO)3(L-L)M(NCR′) (M = Mo, W; L–L = tmeda
Carbamoylation of Aryl Halides by Molybdenum or Tungsten Carbonyl Amine Complexes
作者:Wei Ren、Motoki Yamane
DOI:10.1021/jo1002592
日期:2010.5.7
When aryl halide is treated with molybdenumcarbonyl amine complex in the presence of base, carbamoylation proceeds to give amide in good yield. The proposed mechanism involves oxidativeaddition of aryl halide to molybdenum(0) complex, migratory insertion to carbon monoxide giving acyl(amino)molybdenum(II) or aryl(carbamoyl)molybdenum(II) intermediate, and reductive elimination of the amide. This
Kinetics and mechanisms of ligand substitution reactions of molybdenum SO2 complexes. Synthesis and X-ray structure of trans-Mo(CO)2 (dmpe) (PPh3) (SO2)
作者:Jian-Kun Shen、Gregory J. Kubas、Arnold L. Rheingold
DOI:10.1016/0020-1693(95)04649-6
日期:1995.12
Kinetic results are reported for intramolecular PPh3 substitution reactions of Mo(CO)2(η1-L)(PPh3)2(SO2) to form Mo(CO)2(η2-L)(PPh3)(SO2) (L = dmpe = (Me)2PC2H4P(Me)2 and dppe=Ph2PC2H4PPh2) in THF solvent, and for intermolecular SO2 substitutions in Mo(CO)3(η2-L)(η2-SO2) (L = 2,2′-bipyridine, dppe) with phosphorus ligands in CH2Cl2 solvent. Activation parameters for intramolecular PPh3 substitution