Phosphorodichloridic acid, phenyl ester → 2-Chloro-5-(diphenylmethyl)-pyridine

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Reaction Steps

Heat 55 g. of the crude 5-(diphenylmethyl)-2-pyridone and 110 ml. of phenylphosphoric dichloride at 200°-210° with stirring for 6 hours. Pour the cooled reaction mixture onto ice, basify with ammonium hydroxide, extract with ethyl ether, dry the ether extracts, and concentrate to a residue. Distill the residue at 160°-175°/0.15 mm. and crystallize the distillate from hexane to obtain 2-chloro-5-(diphenylmethyl)-pyridine, m.p. 69.5°-71°.

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