Dioxomolybdenum(VI) complexes with tri- and tetradentate aminobis(phenolate)s

: Lehtonen A, Sillanpaa R

Publisher: PERGAMON-ELSEVIER SCIENCE LTD

: 2005

Polyhedron

: POLYHEDRON

: 24

: 1

: 257

: 265

: 9

: 0277-5387

DOI: https://doi.org/10.1016/j.poly.2004.11.003

The reactions of tridentate ligands, bis(2-hydroxy-3,5-dimethylbenzyl)methylamine (H2ONOMe) and bis(2-hydroxy-3-tert-butyl-5-methylbenzyl)methylamine (H2ONO/Bu) with [MoO2(acac)(2)] (1) in methanol lead to the precipitation of monomeric dioxomolybdenum(VI) complexes [MoO2(ONOMe)(MeOH)] . MeOH (2a) and [MoO2(ONO/Bu)(MeOH)] . MeOH (2b), respectively. Identical reactions n acetonitrile provide dimeric complexes [Mo2O2(mu-O)(2)(ONOMe)(2)] (3a) and [Mo2O2(mu-O)(2)(ONO/Bu)(2)] (3b). The reactions of 1 with tetradentate ligands, N,N'-bis(2-hydroxy-3,5-dimethylbenzyl)-N,N'-dimethylethane-1,2-diamine (H2ONNOMe) and N,N'-bis(2-hydroxy-3,5-di-tert-butylbenzyl)-N,N'-dimethylethane-1,2-diamine (H2ONNOtBu) yield monomeric complexes [MoO2(ONNOMe)] (4a) and [MoO2(ONNOtBu)] (4b), respectively. All studied complexes catalyse oxotransfer reactions between DMSO and benzoin or triphenyl phosphine. Complexes can also be activated by Et2AlCl to polymerise norbornene. (C) 2004 Elsevier Ltd. All rights reserved.

alkoxide complexes, crystal structure, molybdenum, phenolate ligands