1-Benzyl-4-piperidone → 1-Benzyl-4-(4-chloro-2-fluorobenzyl)-4-piperidinol

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A sample of 4-chloro-2-fluorobenzyl bromide is converted to its Grignard reagent which is reacted with N-benzyl-4-piperidone to provide 1-benzyl-4-(4-chloro-2-fluorobenzyl)-4-piperidinol in the manner described in Example 4A. This product is distilled at 175°-180° C., 0.18 mm, to provide an orange oil which is converted in ether to its hydrogen chloride salt. The salt is recrystallized four times from an ethyl alcohol-ether mixture to provide the purified salt, mp 211.5°-213° C.

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