CC1C=CC(C(O)=O)=CC=1.C(ON1C(=O)C2=CC=CC=C2C1=O)(=O)C.O=O.[C:28](O)(=[O:38])[C:29]1[CH:37]=[CH:36][C:32]([C:33]([OH:35])=[O:34])=[CH:31][CH:30]=1>[Ti].O.O.O.O.C([O-])(=O)C.[Co+2].C([O-])(=O)C.O.O.O.O.C([O-])(=O)C.[Mn+2].C([O-])(=O)C.C(O)(=O)C>[C:33]([C:32]1[CH:36]=[CH:37][C:29]([CH:28]=[O:38])=[CH:30][CH:31]=1)([OH:35])=[O:34]
In a 500-ml titanium autoclave, 15.36 g (0.113 mol) of p-toluic acid, 0.232 g (1.13 mmol) of N-acetoxyphthalimide, 0.79 mmol of cobalt(II) acetate tetrahydrate, 0.79 mmol of manganese(II) acetate tetrahydrate and 107 g of acetic acid were placed, the resulting mixture was stirred at 150° C. in an atmosphere of a mixture of oxygen and nitrogen gases (1:1) [4 MPa (gauge pressure)] for 1 hour and thereby yielded terephthalic acid in a yield of 70.6% with a conversion from p-toluic acid of 74.3%. A small amount of 4-carboxybenzaldehyde was by-produced.
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