Autoxidation of 2,6-di-t-butylphenol catalyzed by cobalt (II) schiff-base complex bound to cationic latex

✍ Scribed by M. Hassanein; F.I. Abdel-Hay; T. El-Hefnawy El-Esawy

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 223 KB
• Volume: 30
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(94)90296-8

✦ Synopsis

Al~tract--A cationic latex has been prepared by emulsion copolymerization of styrene and divinylbenzene with 2 mol% of quaternary ammonium ion surfactant monomer 2. The cationic latex-bound cobalt (II) complex of N,N'-ethylenebis-(salicylaldimine-5-sodium sulphonate) 1 showed high catalytic activity in the autoxidation of 2,6-di-butylphenol in water compared with the conventional polymer-free system. Reaction product was identified as 2,6-di-t-butyl-l,4-benzoquinone and the oxidative coupling product 3,Y,5,5'-tetra-t-butyl-4,4'-diphenoquinone. Reaction rate has been found to increase with increase of the concentration of Schiff-base complex 1 and to decrease as the concentration of latex particles increases at constant concentration of I. The rate dependence on pH and phenol concentration showed a maximum. Colloidal catalyst showed some loss of activity after successive runs.