Process for the preparation of 3-aryl-benzofuran-2-ones

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 307/83 (2006.01) C07D 307/82 (2006.01) C07D 405/04 (2006.01) C07D 405/06 (2006.01) C07D 407/04 (2006.01) C07D 409/04 (2006.01) C07D 409/06 (2006.01) C07D 411/04 (2006.01) C07D 413/04 (2006.01) C07D 417/04 (2006.01) C07D 471/04 (2006.01) C07D 473/00 (2006.01) C07D 475/00 (2006.01) C07D 487/04 (2006.01) C08K 5/1535 (2006.01) C08K 5/34 (2006.01) C08K 5/45 (2006.01) C10L 1/18 (2006.01) C10M 129/70 (2006.01) C10M 133/38 (2006.01) C10M 135/32 (2006.01)

Patent

CA 2352679

The instant invention discloses a process for the preparation of compounds of formula I (see formula I), wherein the general symbols are as defined in claim 1, which process comprises hydrolyzing a compound of formula V (see formula V), wherein the general symbols are as defined in claim 1, in an aqueous solvent in the pre-sence of an acid. The compounds of the formula V are new and useful as stabilizers for protecting organic materials, in particular polymers and lubricants, against oxidative, thermal or light-induced degradation.

La présente invention porte sur un procédé permettant la préparation de composés représentés par la formule I (voir formule I), où les symboles généraux ont la signification indiquée à la réclamation 1, lequel procédé comprend l'hydrolyse d'un composé représenté par la formule V (voir formule V), où les symboles généraux ont la signification indiquée à la réclamation 1, dans un solvant aqueux en présence d'un acide. Les composés de formule V sont des nouveaux composés utiles comme agents stabilisants qui favorisent la protection contre la dégradation thermique, par oxydation ou induite par la lumière, en particulier chez les polymères et les lubrifiants.

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