C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 251/24 (2006.01) C07D 251/22 (2006.01)
Patent
CA 2263090
A process for preparing 2-(2,4-dihydroxyphenyl)-4,6-diaryl-s-triazines or related compounds in three steps starting with cyanuric halide or corresponding phenoxy or alkoxy substituted triazine is described. Step 1 involves the nucleophilic displacement of one or two leaving groups in the triazine with a phenolic moiety. Step 2 involves a Friedel-Crafts reaction using a Lewis acid catalyst (preferably aluminum chloride) to replace the remaining leaving groups) with aryl groups such as xylyl. Finally, step 3 involves replacing the phenolic moiety with a phenol such as resorcinol using preferably a protic acid catalyst or a combination of a Lewis acid and a protic acid catalyst. Alternatively, step 3 may be performed alone, e.g. starting from materials from other processes, or leading directly to a tris- hydroxyphenyl-s-triazine. The s-triazines prepared are useful as UV absorbers for the stabilization of organic substrates against the adverse effects of actinic light.
Ackerman Michael
Hayoz Pascal
Meuwly Roger
Oswald John Francis
Schregenberger Christian
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
LandOfFree
Novel methods for the preparation of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Novel methods for the preparation of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Novel methods for the preparation of... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1554229