Epoxidation of cyclohexene catalysed by MnII supported on α-titanium arsenate as catalyst and dry TBHP as an oxidant

School of Chemical Sciences, Takshashila Campus, Khandwa Road, Devi Ahilya University, Indore-452 017, Madhya Pradesh, India E-mail : kharesavita@rediffmail.com Manuscript received 5 August 2005, revised 10 May 2006. accepted 16 May 2006 Manganese supported on a-titanium arsenate {α-TiMnIIAs} was synthesized by ion-exchange method and characterized by DSC. Its catalytic activity is reported for cpoxidation of cyclohexene using dry tert-butylhydroperoxide (TBHP) as an oxidant.In the epoxidation reaction cyrlohexene was oxidized to cyclohexene oxide,cyclohexenol and cyclohexenone. The effect of catalyst concentration and cyclohexene concentration was studied on epoxidation of cyclohexene and optimum concentrations were obtained for maximum selectivity for epoxidation of cyclohexene. A maximum selectivity (86.09%) for epoxidation of cyclohexene was observed for α-TiMnIIAs/dry TBHP system after 4 h of reaction when concentrations of catalyst and substrate were 0.20 mmol and 20 mmol respectively, The mechanism for epoxidation of cyclohexene catalyzed by a:-TiMnIIAs/dry TBHP system is proposed