4,4'-Dimethoxybenzophenone → n-Hydroxy-1,1-bis(4-methoxyphenyl)methanimine

Participants

Reaction Steps

4,4′-Dimethoxybenzophenone (25 g, 103 mmol) is suspended in ethanol (150 ml) and pyridine (30 ml). Hydroxylamine hydrochloride (21.50 g, 310 mmol) is added and the reaction mixture is refluxed. The reaction is shown to be complete by TLC after 3 hours. The reaction mixture is allowed to cool and the solvent is removed in vacuo. The residue is partitioned between ethyl acetate (500 ml) and water (500 ml). The organic layer dried is over MgSO4, filtered and the solvent removed in vacuo. The title compound is obtained following crystallisation from ethylacetate/cyclohexane. 1H nmr (CDCl3, 400 MHz); 7.70(s, 1H), 7.40 (d of d, 4H), 6.95(d, 2H), 6.85(d, 2H), 3.85(s, 3H), 3.80(s, 3H).

Provenance & Evidence