Process for preparing a 5,5'-methylenebis(2-hydroxy-4-alkoxybenz

Details Process for preparing a 5,5'-methylenebis(2-hydroxy-4-alkoxybenz Process for preparing a 5,5'-methylenebis(2-hydroxy-4-alkoxybenz

1978-02-22

1980-01-29

Hoke, V. P.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 458N, 260 458NZ, 260 459R, 260 4595F, 2603265B, 260570R, 2603265C, 544101, 546101, C07C 4500

Patent

active

041861515

ABSTRACT:
A novel process is provided for preparing 5,5'-methylenebis(2-hydroxy-4-alkoxybenzophenone), comprising forming a novel 2-hydroxy-4-alkoxy-5-aminomethylbenzophenone by a reaction of a 2-hydroxy-4-alkoxybenzophenone with an amine and formaldehyde, and causing the 2-hydroxy-4-alkoxy-5-aminomethylbenzophenone to react with a 2-hydroxy-4-alkoxybenzophenone or to dimerize.
Both the aminomethylhydroxyalkoxybenzophenone and the methylenebis (2-hydroxy-4-alkoxybenzophenone) which are prepared according to this invention are useful to prevent photo-degradation of organic materials, particularly as light stabilizers for synthetic resins.

REFERENCES:
patent: 2763657 (1956-09-01), Allen et al.
patent: 3160665 (1964-12-01), Siegrist et al.
patent: 3285912 (1966-11-01), Palopoli et al.
patent: 3649695 (1972-03-01), Millionis

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