Chlorine → 4'-Chloro-2'-fluoroacetanilide

Participants

Reaction Steps

A solution of 140 parts of 2'-fluoroacetanilide in 500 parts glacial acetic acid was treated with 71 parts of chlorine during 1 hour at 25°-27° C with ice-water cooling. While stirring for 4 hours at 25°-27° C, 4'-chloro-2'-fluoroacetanilide precipitated. After collecting the product by filtration, the filtrate was poured over 2000 parts of ice. The resulting second portion of product pecipitated was collected by filtration, combined with the first portion and recrystallized from 700 parts of methanol at -45° C. to yield 119 parts of 4'-chloro-2'-fluroacetanilide as white crystals melting at 152°-155° C.

Provenance & Evidence