6-(4-Hydroxyphenyl)-4,5-dihydro-3(2h)-pyridazinones and stabiliz

Details 6-(4-Hydroxyphenyl)-4,5-dihydro-3(2h)-pyridazinones and stabiliz 6-(4-Hydroxyphenyl)-4,5-dihydro-3(2h)-pyridazinones and stabiliz

1986-10-06

1989-12-19

Berch, Mark L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544239, 560 53, C07D23714, C07D40312, C07D40104, C07D40314

Patent

active

048884235

ABSTRACT:
6-(4-hydroxyphenyl)-4,5-dihydro-3(2H)-pyridazinones of formula I ##STR1## where R.sub.1 and R.sub.2 are independently alkyl, cycloalkyl, aryl or aralkyl, R.sub.3 and R.sub.4 are independently hydrogen or alkyl, n is 1 to 4 and T is hydrogen, alkyl, substituted alkyl, alkylene or arylene, are effective in stabilizing organic materials against oxidative, thermal and actinic degradation.

REFERENCES:
patent: 3377154 (1968-04-01), Reichemeder et al.
patent: 4011321 (1977-03-01), Coates et al.
patent: 4397854 (1983-08-01), Sircar
Derwent Abstract 84-244171/40 for German 1,670,295.

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