Di-terf-butylphenol

Amino-2,6-di-terf-butylphenol reacts normally with saiicylaldehydes to form Schiff bases, and complexes of the type [ZnL lfHL = 18) have been isolated, and shown to generate radical species on treatment with Pb02. In contrast, reaction with bis(diketonato)zinc(II) complexes leads not to the Schiff bases, but to the monoiminoquinone complexes (19).326... 

At the same time, there is little advantage in having the alkoxy group in position 4 of 2,6-di-terf-butylphenol, as shown on comparison with the compound substituted in the same position by the methyl group and with 2,6-di-tert-butylphenol itself, a compound with a free position 4 (Ari = 2.69). Different influences of the nature of the substituent in... 

Table I shows the results obtained with various bisphenols which are generally considered quite effective as thermal antioxidants. Most of these additives did not retard the discoloration of the polymer. One compound, 4,4 -methylenebis(2,6-di-terf-butylphenol), showed some promise, but it discolored the polymer initially and, therefore, cannot be considered of practical importance.

It has long been known (93) that cobalt(II) complexes of phthalocyanines interact with molecular oxygen. The water-soluble tetrasulfonato derivative of the parent phthalocyanine selectively and catalytically oxidizes 2,6-di-terf-butylphenol to the benzoquinone and the dipheno-quinone in both homogeneous solution (94) and when polymer-supported (95). The active intermediate in the catal d ic cycle is proposed to be the (as expected) mononuclear dioxygen complex of the cobalt-tetrasulfonatophthalocyanine system (92). It has been proposed that the formation of a peroxo-bridged dinuclear complex is responsible for the deactivation of the cobalt(II)-tetrasulfonatophthalocyanine system, since such a dinuclear system would be unable to further bind and activate dioxygen (96). Such deactivation results, ultimately, in loss of the catalyst and low turnover ratios. 

The first reports on polymer-bound phenolic stabilizers for the preparation of poly[propene-co-4-(hept-6-enyl)-2,6-di-terf-butylphenol] show much higher stability of the resulting copolymer toward irradiation than commercial available poly(propene) containing non-polymer-bound stabilizers.In the copolymerization reactions of... 

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