2-Chloroacetyl phenothiazines were reacted with certain phenols and salts of some acids under different conditions to yield 2-substituted acetylphenothiazines. Another series of 10- substituted phenothiazines was synthesized by treatment of 10-chloroacetylphenothiazine with either the appropriate amines or salts of the respective acids. The optimum experimental conditions for the preparation of 2-chloroacetyl-10-acetyl-phenothiazine by ...