申请人:Ethyl Corporation
公开号:US04994580A1
公开(公告)日:1991-02-19
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.
在加热反应性Diels-Alder双烯丙烃基团的作用下,3,3'-硫代双(2,5-二氢噻吩-1,1-二氧化物)会发生反应,产生含有两个六元环螺环的硫醚分子,例如4,4'-硫代双(3,6-二氢邻苯二甲酸)或其酯、酸酐或亚胺,以及4,4'-硫代双(1,2,3,6-四氢邻苯二甲酸)或其酯、酸酐或亚胺。二氢噻吩二氧化物的两个环都参与了反应,显然通过形成四烯结构与两当量的双烯丙烃基团共同反应,形成加合物,其中每个六元环都具有一个或两个烯丙双键。在反应过程中,硫醚桥保持完整。一些双(螺环)硫醚易于通过已知的芳构化方法和体系转化为相应的双(芳香族)硫醚。描述了上述反应产物的各种实用性。