3,4-dihydro-2h-benzopyran derivatives, a method of producing them, a method of using them as stabilizers for organic materials, and organic compositions containing such stabilizers

Abstract From the Canadian patent

There is provided a class of novel 3,4-dihydro-2Hbenzopyran derivatives which either have excellent inhibitory activity against unfavorable effects of heat light and oxidative factors or are of use as precursors of compounds having such activity, and methods for producing these derivatives. Also provided are methods of using such 3,4-dihydro-2H-benzopyran derivatives as stabilizers for organic materials sensitive to heat light or/and oxidative factors, and organic compositions containing such stabilizers.