R mahmoudian - research &development unit arak petrochemical co arak iran
m mahmoudian - department of chemistry university isfahan
m.a salehi - S.T.P.C,mahshahr
a emamin rad - research &development unit arak petrochemical co arak iran

the hydroxylation of phenol using cobalt II complexes of bidentate ligand N,N-ethylenebis salicylideneamine salen N,N- propylenbis salicylideneamine salpn and N,N- phenylenebis salicylideneamine salophen were investigatted. These complexes catalyze the liquid -phase hydroxylation of phenol with H2O2 to catechol as a major product and hydroquinone as a minor product .

coII complexes, zeolite -Y,phenol hydroxylation , catechol , hydroquinone