Molybdenum(VI) Bisimidoaryl Phenoxide and Alkoxide Complexes: Molecular Structures of [Mo(NAr)2(OCMe2-2-py)(CH2SiMe3)] and [{Mo(NAr)2Me(OMe)}2]

✍ Scribed by Jim A. M. Brandts; Jaap Boersma; Anthony L. Spek; Gerard van Koten

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 363 KB
• Volume: 1999
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(199910)1999:10<1727::aid-ejic1727>3.0.co;2-u

✦ Synopsis

The synthesis and characterisation is reported of new, five-group by transmetallation with MeMgCl or LiCH 2 SiMe 3 . The solid state structure of [Mo(NAr) 2 (OCMe 2 -2-py)(CH 2 SiMe 3 )] (5) coordinate molybdenum(VI) bisimidoaryl complexes [Mo(NAr) 2 (O-N)(R)] [Ar = C 6 H 3 (iPr) 2 -2,6; O-N = 2-has been determined by single-crystal X-ray analysis. A similar synthetic procedure was used to synthesise and characterise pyridyldiphenylmethoxide (a), 2-pyridyldimethylmethoxide (b), 8-quinolinolate (c); R = Cl, Me, CH 2 SiMe 3 ] and the [{Mo(NAr) 2 Me(OMe)} 2 ] (7). The two methoxide ligands bridge between the two molybdenum(VI) nuclei. Compounds in which corresponding bisalkoxide (a, b) and bisphenolate [c, d = (OC 6 H 4 CH 2 NMe 2 -2) -] Mo VI bisimidoaryl complexes the ligand can form six-membered chelate rings {like [Mo(NAr) 2 (OC 6 H 4 CH 2 NMe 2 -2) 2 ] (9) and analogues} are [Mo(NAr) 2 (O-N) 2 ]. These complexes can be formed by simple alcoholysis reactions between [Mo(NAr) 2 Cl 2 (DME)] and the usually difficult to obtain in a pure form and yields are typically low. appropriate alcohol in the presence of Et 3 N. The remaining chloride can be replaced by a methyl or trimethylsilylmethyl tially O,N-chelating ligands, i.e.