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Condensation of trimethylhydroquinone with aldehydes provides 2,4-disubstituted 5,7,8-trimethyl-4H-benzo[1,3]dioxin-6-ols in a straightforward one-pot reaction. These compounds are 3-oxa-derivatives of α-tocopherol (vitamin E) and represent an interesting novel class of phenolic antioxidants. The formation reaction proceeds according to a two-step mechanism consisting of electrophilic substitution and acetalization, and provides the product as a cis/trans-mixture of diastereomers. 相似文献
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铁酸镁在2,3,6-三甲基苯酚羟基化反应中的催化性能 总被引:5,自引:0,他引:5
采用共沉淀法与柠檬酸法合成了铁酸镁,并用X射线衍射和红外光谱等对不同样品进行了表征.以三甲基苯酚为原料,以铁酸镁为催化剂,以双氧水为氧化剂,实现了一步羟化为三甲基对苯二酚(维生素E重要中间体)的目的.详细考察了催化剂、温度、溶剂和双氧水等因素对该反应体系的影响.结果表明,铁酸镁对该反应体系具有很好的催化效果,较常用的羟化催化剂TS-1分子筛等的催化性能好得多.该过程可以进一步研究发展成为一个环境友好催化过程. 相似文献
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Odinokov V. N. Spivak A. Yu. Emelianova G. A. Kutepov B. I. Khalilov L. M. 《Russian Chemical Bulletin》2001,50(11):2227-2230
-Tocopherol analogs with double bond-containing side chains were synthesized by condensation of trimethylhydroquinone with optically active (3R/S,4S)-3,4,8-trimethylnona-1,7-dien-3-ol and linalool in the presence of the zeolite-containing Tseokar-10 aluminosilicate. Ozonolysis of these compounds gave the corresponding chromans with -formyl or (after hydride reduction) -hydroxyl groups in the side chain. 相似文献
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