Process for the preparation of mono- and diaryltriazines

Details Process for the preparation of mono- and diaryltriazines Process for the preparation of mono- and diaryltriazines

C - Chemistry, Metallurgy

07

D

C07D 251/14 (2006.01) C07D 251/20 (2006.01) C07D 251/22 (2006.01)

Patent

CA 2099484

Process for the preparation of mono- and diaryltriazines Abstract of the Disclosure A process for the selective preparation of 2,4-dichloro-6-aryl- or 2-chloro-4,6-diaryl- 1,3,5-triazines is described, which comprises reacting a compound of formula II Image (II) wherein X is a bromine or chlorine atom, and R1 and R2 aree as defined above, intetrahydrofuran with magnesium metal to form the corresponding Grignard reagent, and reacting the resultant solution with cyanuric chloride of formula II Image (III) such that, if Z is -C1, at least 1.05 mol and, if Z is a radical of formula Ib, at least 2.1 mol, of Grignard reagent is used per 1 mol of cyanuric chloride. The compounds of formula I can be used with advantage for the preparation of 2-(o-hydroxyphenyl)-4,6-diaryl- s-triazines, which are known light stabilisers for organic material.

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