Conclusions
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1.
The oxidation of isotactic polypropylene, inhibited by additions of 2, 2′-dihydroxy-3, 3′, 5, 5′-tetra-tert-butyldiphenyl, 2, 2′-dihydroxy-3, 3′-bis-trimiethylsilyl-5, 5′-di-tert-butyldiphenyl, 4, 4′-bis-(2, 6-di-tert-butylphenol), and di-(3, 5-di-tert-butyl-4-hydroxybenzyl) sulfide, was studied; the first two are weak antioxidants, while the other two are strong antioxidants.
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2.
In the absence of reducing agents for the hydroperoxide groups, high antioxidative activity is possessed by conformations in which the OH groups are bonded together by a hydrogen bond. Of the biphenols with unbonded OH groups, substituted 4, 4′-dihydroxydiphenyl proved to be an effective antioxidant.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 1074–1079, May, 1972.
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Livanova, N.M., Vasileiskaya, N.S., Muslin, D.V. et al. Conformations and antioxidative properties of binuclear alkylphenols. Russ Chem Bull 21, 1030–1034 (1972). https://doi.org/10.1007/BF00853762
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DOI: https://doi.org/10.1007/BF00853762