Premium Oxidovanadium(V) Complexes Anchored on Carbon Materials as Catalysts for the Oxidation of 1‐PhenylethanolPremium
Martins Luísa M. D. R. S.,
Carabineiro Sónia A. C.,
Guedes da Silva M. Fátima C.,
Buijnsters Josephus G.,
Figueiredo José L.,
Pombeiro Armando J. L.
Abstract Six oxidovanadium(V) aroylhydrazone complexes derived from (3,5‐di‐ tert ‐butyl‐2‐hydroxybenzylidene)‐2‐hydroxybenzohydrazide (H 2 L 1 ) and (3,5‐di‐ tert ‐butyl‐2‐hydroxybenzylidene)‐2‐aminobenzohydrazide (H 2 L 2 ), namely, [VOL 1 (OEt)][VOL 1 (OEt) (EtOH)] ( 1 ), [VOL 2 (OEt)] ( 2 ), [Et 3 NH][VO 2 L 1 ] ( 3 ), [VO 2 (HL 2 )] ⋅ 2 EtOH ( 4 ), [(VOL 1 ) 2 (μ‐O)] ( 5 ), and [(VOL 2 ) 2 (μ‐O)] ( 6 ), were synthesized and characterized by elemental analysis, IR, 1 H NMR, and 51 V NMR spectroscopies, ESI‐MS and, for 1 – 5 , single‐crystal XRD. The compounds have VO 3+ ( 1 and 2 ), VO 2 + ( 3 and 4 ), and V 2 O 3 4+ ( 5 and 6 ) cores. They are active homogeneous catalysts in the microwave‐assisted, solvent‐free peroxidative oxidation of 1‐phenylethanol to acetophenone by t BuOOH. The immobilization of the oxidovanadium complexes ( 1 , 2 , 4 , and 5 ) on oxidized carbon materials improved the oxidation efficiency and allowed catalyst reuse with the preservation of activity.
Subject(s)carbon fibers , catalysis , chemistry , composite material , composite number , heterogeneous catalysis , materials science , organic chemistry
SCImago Journal Rank1.497
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