Hindered phenolic cyclic phosphonates and stabilized composition

Details Hindered phenolic cyclic phosphonates and stabilized composition Hindered phenolic cyclic phosphonates and stabilized composition

1976-09-03

1978-06-06

Sutto, Anton H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260927R, 260937, C08K 553, C07F 915

Patent

active

040935884

ABSTRACT:
The compounds are hindered phenolic mono- and bicyclic phosphonate compounds having the formula ##STR1## wherein R.sup.1 is alkyl, R.sup.2 is tert-alkyl, R.sup.3 and R.sup.4 are independently hydrogen or alkyl, R.sup.5 is hydrogen, alkyl or phenyl, R.sup.6 is alkyl or phenyl, R.sup.7 is lower alkyl and R.sup.8 is alkyl, phenyl or phenyl substituted with a lower alkyl group.
These compounds are usually prepared by reaction of a tert-alkylsubstituted hydroxybenzylphosphonate ester with a suitable 1,2 or 1,3 polyol. Alternatively the compounds can be made by reaction of an alkali metal salt of the substituted benzylphosphonic acid with an appropriate alkylene dihalide.
The compounds are useful as stabilizers for organic materials subject to oxidative, thermal or photochemical degradation.

REFERENCES:
patent: B512373 (1976-02-01), Spivack et al.
patent: 3787540 (1974-01-01), Schmidt et al.
patent: 3790648 (1974-02-01), Schmidt et al.
patent: 3839506 (1974-10-01), Hechenbleikner et al.
patent: 3962377 (1976-06-01), Spivack

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