Patent ID: 6392093
Filing Date: 2002-05-21
Classification: C07C

Abstract:
A process for the oxidation of cyclohexane to adipic acid, which comprises contacting cyclohexane with oxygen in the presence of a solid catalyst containing an encapsulated substituted salen metal complex wherein some of the hydrogen atoms of said complex were substituted by one or more electron withdrawing groups, in the presence or absence of solvents, with or without a promoter, wherein said encapsulated metal complex is selected from the group consisting of: N,Nâ€²-bis(salicylaldehyde/substituted salicylaldehyde) ethylenediimine (salen), N,Nâ€²-bis(salicylaldehyde/substituted salicylaldehyde) 1,3-propylenediimine (saltin), N,Nâ€²-bis(salicylaldehyde/substituted salicylaldehyde 1,2-phenylenediimine (salophen), N,Nâ€²-bis(salicylaldehyde/substituted salicylaldehyde) 1,2-cyclohexanediimine(salcyhexen) and isolating the formed adipic acid.