Osmium(III)o-semiquinonato complexes and their use as catalysts for the oxidation of alcohols
作者:Ahmed M. El-Hendawy
DOI:10.1016/s0020-1693(00)85881-8
日期:1991.1
The new complexes [Os(III)Cl2(PPh3)2SQ'] (SQ' = o-semiquinone; 1,2-benzosemiquinone (SQ), 4-methyl-1,2-benzosemiquinone, 3,5-di(tert-butyl)-1,2-benzosemiquinone, tetrachloro(tetrabromo)-1,2-benzosemiquinone and 2,3-naphthosemiquinone) have been isolated. They were characterised by spectroscopic techniques and investigated by cyclic voltammetry. The complex [OsCl2(PPh3)2SQ] was found to be more efficient than the reported [Os(III)Cl2(PPh3)2acac] as a catalyst for the oxidation of primary alcohols to aldehydes and of secondary alcohols to ketones in the presence of N-methylmorpholine-N-oxide as co-oxidant.
Complexes of lawsone with uranium, molybdenum, ruthenium and osmium, and their use as organic oxidants
作者:Ahmed M. El-Hendawy
DOI:10.1016/s0277-5387(00)86217-8
日期:1991.1
The new complexes trans-[UO2(NQ)2], cis-[MoO2(NQ)2] and [M(III)Cl2(EPh3)2 NQ] (M = Ru, E = As; M = Os, E = P; HNQ = lawsone, 2-hydroxyl-1,4-naphthoquinone) have been prepared. They were characterized by spectroscopic techniques and investigated by cyclic voltammetry. The complex [RuCl2(AsPh3)2NQ] was found to be a more efficient catalyst than that of the osmium complex for the oxidation of primary alcohols to aldehydes and of secondary alcohols to ketones in the presence of N-methylmorpholine-N-oxide as co-oxidant.