Ethanone, 2-(4-chlorophenyl)-1-phenyl- → HCID 85675368, compound

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To a solution of 2-(4-chlorophenyl)-1-phenyl-1-ethanone (2, 1.93 g, 8.37 mmol) in 25 ml pyridine (dried over molecular sieves) under nitrogen was added at room temperature methoxylamine hydrochloride (873 mg, 10.5 mmol). The resulting slightly cloudy, pale orange mixture was stirred at room temperature overnight. The pyridine was removed in vacuo with heating. The residual solids were stirred with ether (60 ml), isolated by filtration, and discarded. The filtrate was dried over sodium sulfate, and concentrated in vacuo to give a mixture of the oxime geometrical isomers as 2.00 g of a clear, pale yellow syrup (92% yield). 1H NMR showed the isomers to be formed in a 5:3 ratio: Rf 0.64, 0.50; IR (CDCl3) 3068 (w), 2940 (m), 2819 (w), 1602 (w), 1493 (s), 1442 (m); 1H NMR (CDCl3) 7.63 (m, 2H), 7.37-7.11 (m, 11.5 H), 4.12 (s, 2H), 4.05 (s, 3H), 3.91 (s, 1.6H), 3.82 (s, 1.2H); low resolution mass spec. 259 (M+, 8), 227 (100), 192 (28), 165 (18), 134 (12), 125 (62), 119 (37).

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