Chemical Abstracts, vol. 73, No. 15, 12 Oct. 1970, Columbus, Ohio, US; Abstract No. 77054k, M. Murakami et al, "5-Substituted methyl-6-chromanol derivatives as antioxidants", p. 353, col. 2, *abstract*, and JP-A-45 014 787 (Yamanouchi Pharmaceuticl Co., Ltd. 25 May 1970. |
Journal of Medicinal Chemistry, vol. 10, No. 4, 1967, Washington, US, pp. 657-660, W.A. Skinner et al, "Structure-Activity Relations in the Vitamin E Series. I. Effects of 5-Methyl Substitution on 6-Hydroxy-2,2,5,7,8-pentamethylchroman", p. 658, Example 18, Table I. |
Bulletin of the Chemical Society of Japan, vol. 52, No. 4, 1979, Tokyo, JP, pp. 1143-1146, K. Murayama et al, "Synthesis of Methyl Substitute Chromanol. An Analogue of Vitamin K", p. 1145, col. 1, Example 6B. |
Database WPI--Week 9401, Derwent Publications Ltd., London, GB; AN 94-002287 & JP-A-5 310 724 (Eisai Co., Ltd.) 22 Nov. 1993--*Abstract*. |
Lau et al. CA 116: 173926 1992. |
Belanger et al. CA 116: 106078 1991. |