Bisbenzofuran-2-ones

Details Bisbenzofuran-2-ones Bisbenzofuran-2-ones

1992-06-24

1993-06-01

Hoke, Veronica P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

106176, 523455, 523511, 524109, 549305, 549307, C08K 515, C07D49300

Patent

active

052160521

ABSTRACT:
Compounds of formula I ##STR1## wherein R.sub.1 is hydrogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.8 cycloalkyl or C.sub.7 -C.sub.9 phenylalkyl, A.sub.1 and A.sub.4 are phenyl, ##STR2## or phenyl which is substituted by 1 to 3 radicals R.sub.3, which radicals R.sub.3 are each independently of one another selected from the group consisting of C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.18 alkoxy, C.sub.3 -C.sub.4 alkenyloxy, C.sub.7 -C.sub.9 phenylalkoxy, C.sub.5 -C.sub.8 cycloalkoxy, C.sub.1 -C.sub.18 alkanoyloxy, C.sub.3 -C.sub.18 alkenoyloxy, benzoyloxy, phenoxy and hydroxy, m is 1 or 2, A.sub.2 and A.sub.3, together with the linking carbon atom, form a C.sub.5 -C.sub.7 cycloalkylidene ring which is unsubstituted or substituted by 1 to 3 C.sub.1 -C.sub.4 alkyl groups, are very suitable for stabilising organic materials against thermal, oxidative or light-induced degradation.

REFERENCES:
patent: 4190583 (1980-02-01), Bauer et al.
patent: 4338244 (1982-07-01), Hinsken et al.
J. Chem. Soc. 1956, 1622.
Organic Syntheses Collective vol. 3 p. 326.
Houben-Weyl vol. 6/IC, 1030.
Organkem 1986, 402-408.

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