New hydroquinone derivatives as scavengers for oxidised...

C - Chemistry – Metallurgy – 07 – C

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C07C 50/02 (2006.01) C07C 50/24 (2006.01) C07C 50/28 (2006.01) C07C 69/732 (2006.01) G03C 7/305 (2006.01) G03C 7/392 (2006.01)

Patent

CA 2350729

New compounds of formula (I) are described, wherein n is > 1; X is O or NR4; L is a n-valent linking group defined in claim 1 and R1 is H, halogen, C1-C25- alkyl, C3-C25-alkenyl, unsubstituted or by C1-C4-alkyl substituted C5-C8- cycloalkyl; R2 and R3 independently of each other are C1-C4alkyl, or together with the carbon atom they are bonded to, form a carbocyclic C5-C7 ring, especially C5-C7cycloalkylene; and m is 1-20, especially 2-4. Compounds of formula (I) are active as Dox-scavengers in color photographic material.

L'invention concerne de nouveaux composés représentés par la formule (I) dans laquelle: n désigne 1; X désigne O ou NR¿4?; L désigne un groupe de liaison n-valent défini dans la revendication 1; R¿1? désigne H, un halogène, un alkyle en C¿1?-C¿25?, un alcényle en C¿3?-C¿25?, un cycloalkyle en C¿5?-C¿8? non substitué ou substitué par un alkyle en C¿1?-C¿4?; R¿2? et R¿3? désignent indépendamment un alkyle en C¿1?-C¿4?, ou pris avec l'atome de carbone auquel ils sont liés, forment un cycle en C¿5?-C¿7? carbocyclique, en particulier un cycloalkylène en C¿5?-C¿7?; et m est compris entre 1 et 20, et notamment entre 2 et 4. Les composés représentés par la formule (I) sont actifs comme capteurs de révélateurs oxydés dans une matière photographique en couleur.

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