CC(C)=[O:3].C(C(C)=O)C.[Br:10][C:11]1[CH:16]=[C:15]([Br:17])[CH:14]=[C:13]([Br:18])[C:12]=1[O-:19].[Na+:20]>O>[OH-:3].[Na+:20].[Br:10][C:11]1[CH:16]=[C:15]([Br:17])[CH:14]=[C:13]([Br:18])[C:12]=1[O-:19].[Na+:20]It has been found that a liquid ketone such as acetone or methyl ethyl ketone when present in this reaction mixture tends to ensure that the desired tris(2,4,6-tribromophenoxy)-s-1,3,5-triazine product is formed in high purity. In experiments wherein a refluxing mixture of water and an alkanol (methanol), was used as the reaction medium for step d), it was found that some of the chloro groups in the cyanuric chloride reacted with the methanol to form bis-(tribromophenoxy)-methoxy-s-1,3,5-triazine as an impurity. On the other hand, when acetone or methyl ethyl ketone was used as the organic solvent in step d), the chloro groups were found to react exclusively with the sodium 2,4,6-tribromophenolate despite of the presence of a large amount of water in the reaction mixture which was carried over from the prior bromination step and the prior use of aqueous NaOH to form the sodium 2,4,6-tribromophenolate.
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