Gabriel Performance Products, LLC

Bao-Guo Huang

Lawrence B Fertel

A 2-bromo-4-chloro substituted phenol is prepared from a first composition of a substituted phenol and benzotrifluoride in a weight ratio to the substituted phenol of about 2 to about 4. Into the first composition is sparged about 1 to about 1.5 equivalents of chlorine gas, whereby the substituted phenol is chlorinated to form a 4-chloro substituted phenol. The first composition is cooled to precipitate the 4-chloro substituted phenol, which can be isolated by filtration. A second composition is formed of the 4-chloro substituted phenol, acetic acid in an weight ratio to the 4-chloro substituted phenol of about 1 to about 2, about 1 to about 2 equivalents of a salt of a strong base and a weak acid, and about 1 to about 5 equivalents of a brominating agent, whereby the 4-chloro substituted phenol is brominated to form a 2-bromo-4-chloro substituted phenol.

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Bao-Guo Huang