[OH-].[K+].[Cl:3][C:4]1[C:5]([C:15]#[N:16])=[C:6]([C:13]#[N:14])[C:7]([Cl:12])=[C:8](Cl)[C:9]=1[Cl:10].[C:17]1([OH:23])[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1>O.CC(C)=O>[Cl:12][C:7]1[C:6]([C:13]#[N:14])=[C:5]([C:15]#[N:16])[C:4]([Cl:3])=[C:9]([Cl:10])[C:8]=1[O:23][C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1A solution of potassium hydroxide (11.2 parts) in water (22 parts) was added dropwise to a stirred solution of 3,4,5,6-tetra-chloro-1,2-dicyanobenzene (26.6 parts) and phenol (9.4 parts) in acetone (100 parts) at 0° C. The solution was stirred at 60° C. for 2 hours before pouring into water (500 parts). The aqueous mixture was extracted with dichloromethane (3×500 parts). The dichloromethane extracts were washed with water (3×200 parts), dried over anhydrous Na2SO4, filtered and the dichloromethane was removed under reduced pressure to leave a brown solid. The solid was recrystallised from butan-1-ol. 3,5,6-Trichloro-l,2-dicyano-4-phenoxybenzene (17 parts) was obtained as a brown solid, m.p. 147°-150° C.
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