申请人:Ethyl Corporation
公开号:US04798900A1
公开(公告)日:1989-01-17
3,3'-Thiobis(2,5-dihydrothiophene-1,1-dioxides) on heating with a reactive Diels-Alder dienophile undergo a reaction producing thioethers having two six-membered alicyclic rings in the molecule, such as 4,4'-thiobis(3,6-dihydrophthalic acids) or the esters, anhydrides or imides thereof, and 4,4'-thiobis(1,2,3,6-tetrahydrophthalic acids) or the esters, anhydrides or imides thereof. Both rings of the dihydrothiophene dioxides participate in the reaction, apparently by forming a tetraene structure which co-reacts with two equivalents of the dienophile to form an adduct in which each six-membered ring has one or two olefinic double bonds. During the course of the reaction, the thioether bridge remains intact. Some of the bis(alicyclic) thioethers are readily converted to the corresponding bis(aromatic)thioethers by use of known aromatization methods and systems. Various utilities for the products of the foregoing reactions are described.
在加热时,3,3'-硫代双(2,5-二氢噻吩-1,1-二氧化物)与具有反应性的迪尔斯-阿尔德双亲烯经历反应,产生具有分子中两个六元脂环的硫醚,例如4,4'-硫代双(3,6-二氢邻苯二甲酸)或其酯、酐或亚胺,以及4,4'-硫代双(1,2,3,6-四氢邻苯二甲酸)或其酯、酐或亚胺。二氢噻吩二氧化物的两个环参与反应,显然通过形成四烯结构,与两等当量的双亲烯共同反应,形成一个产物,其中每个六元环具有一个或两个烯烃双键。在反应过程中,硫醚桥保持完整。一些双(脂环)硫醚可通过已知的芳构化方法和系统轻松转化为相应的双(芳香)硫醚。描述了上述反应产物的各种用途。