Preparation and catalytic studies of bis(halogeno) dioxomolybdenum(VI)-diimine complexes
authors Petrovski, Z; Pillinger, M; Valente, AA; Goncalves, IS; Hazell, A; Romao, CC
nationality International
journal JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
author keywords molybdenum; nitrogen ligands; oxide complexes; olefin epoxidation; X-ray diffraction
keywords ALKENE EPOXIDATION; ALKYL HYDROPEROXIDES; OLEFIN EPOXIDATION; OXIDATION; REACTIVITY; ADDUCTS; LIGAND
abstract Dioxomolybdenum(VI) complexes of the type MoO(2)X(2)L containing ethylenediimine ligands were prepared in good yield by reaction of MoO(2)X(2)(THF)(2) (X = Cl, Br) with the bidentate ligands Ph(2)C=NCH(2)CH(2)N=CPh(2) (PBED) or PhCH=NCH(2)CH(2)N=CHPh (BED). The crystal structure of MoO(2)Br(2)(BED) was determined by X-ray diffraction. The dichloro complexes were active as catalysts for the reaction of cyclooctene with tert-butyl hydroperoxide (TBHP) at 55 degreesC yielding epoxycyclooctane as the only product up to 7 h after the start of the reaction. The highest initial activity was obtained with MoO(2)Cl(2)(BED) (63 mol mol(Mo)(-1) h(-1)). Other olefins were also tested, and activities decreased in the order cyclooctene > cycloclodecene > (R)-(+)-limonene > cyclohexene > trans-2-octene > 1-octene. The dibromo complexes exhibited much lower activities than the dichloro complexes for the epoxidation of cyclooctene. (C) 2004 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 1381-1169
year published 2005
volume 227
issue 1-2
beginning page 67
ending page 73
digital object identifier (doi) 10.1016/j.molcata.2004.10.004
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000226424000009
  ciceco authors
  impact metrics
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg