Add time:07/14/2019 Source:sciencedirect.com
The synthesis of mononuclear complexes M(HL)2·nS [M = copper(II), nickel(II) and cobalt(II), S = solvent] and M′(HL)2OH·nS [M′ = iron(III) and vanadyl(V)] and of the binuclear complexes M2L2·nS [M = copper(II), nickel(II) and cobalt(II)] and Fe2L2(OH)2·H2O and (VO)2L2SO4·4H2O derived from 2,2′-dihydroxy-3,3′-diacetyl-5,5′-dichlorodiphenylmethane (H2L) is reported. Their coordination geometry is discussed on the basis of physico-chemical data. Magnetic measurements at room temperature suggest that no interactions between metal ions are present in the binuclear chelates. Iron(III) and vanadyl(V) complexes were used as catalysts for the oxidation of 3,5-di-t-butyl-1,2-dihydroxybenzene (3,5-DBTC). From the oxidative cleavage, 3,5-di-t-butyl-o-quinone (3,5-DTBQ), 3,5-di-t-butyl-l-oxacyclohepta-3,5-diene-2,7-dione (3,5-DTBODD), 3,5-di-t-butyl-5-carboxymethyl-2-furanone (3,5-DTBCF) and 4,6-di-t-butylpyrone-2-one (4,6-DTBP) were isolated and identified by mass, IR and 1H NMR data. The title compound was reacted to give a hexaketone by application of the Wittig method. A polymeric Schiff base was obtained by reaction of the diacetyl derivative with ethylenediamine, also in the presence of nickel(II) perchlorate or boric acid.
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