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Radically different antioxidants: thermally generated carbon-centered radicals as chain-breaking antioxidants.

Journal of the American Chemical Society (2006-12-21)
Mathieu Frenette, Patricia D MacLean, L Ross C Barclay, Juan C Scaiano
ABSTRACT

A new class of thermally activated chain-breaking antioxidants is presented. Dimers of persistent carbon-centered radicals are able to inhibit the autoxidation of cumene and styrene with better rate constants than the commercial antioxidant Irganox HP-136 and 3,5-di-tert-butyl-4-hydroxyanisole. A dramatic increase in antioxidant activity is observed with increasing temperature as more dimers dissociate to their corresponding persistent radicals.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Cumene, 98%
Supelco
Cumene, Pharmaceutical Secondary Standard; Certified Reference Material
Supelco
Cumene, PESTANAL®
Supelco
Cumene solution, certified reference material, 5000 μg/mL in methanol

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