Structures of two alkaline autoxidation products of BHA, a widely used antioxidant |
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Authors: | Masao Kawai Masao Muto Yoshiaki Murase Shuki Araki Komei Kafuku Hiroshi Yoshioka Kazumi Nakatsu Yasuo Butsugan |
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Institution: | (1) Department of Applied Chemistry, Nagoya Institute of Technology, Japan;(2) Kobayashi Kirokushi Co. Ltd, Japan;(3) Nagoya Municipal Industrial Research Institute, Japan;(4) School of Science, Kwansei Gakuin University, Japan |
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Abstract: | In order to confirm the structures of the autoxidation products of 2-tert-butyl-4-methoxyphenol (BHA), X-ray crystallographic analyses have been undertaken. One of the products was converted to a dibenzoate, which was subjected to the analysis to establish the structure as the O
6,O
7-dibenzoyl derivative of (1R*,2R*,6S*,7S*,9R*)-4,9-di-tert-butyl-6,7-dihydroxytricyclo5.2.2.02, 6]undec-4-ene-3,8,10-trione. Crystallographic analysis of the major isomer of the two isomeric products gave its structure as (E)-4-tert-butyl-2-(3-tert-butyl-4-oxocyclopent-2-en-1-ylidene)cyclopent-4-ene-1,3-dione, which also established the structure of the minor isomer as the corresponding (Z)-isomer. |
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Keywords: | 2-tert-Butyl-4-methoxyphenol antioxidant autoxidation tricyclo[5 2 2 02 6]undecane derivative oxocyclopentenylidenecyclopentenedione derivative |
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