申请人:Hoechst Aktiengesellschaft
公开号:US05847149A1
公开(公告)日:1998-12-08
Thiadiazole derivatives of the formula (I) X-B-A.sup.1 -(M.sup.1 -A.sup.2 -).sub.m (M.sup.2 -A.sup.3).sub.n -R.sup.1(I ) in which the symbols and indices have the following meanings: X is Cl, Br or I; B is 1,3,4-thiadiazole-2,5-diyl; A.sup.1, A.sup.2 and A.sup.3 are identical or different and are substituted or unsubstituted 1,4-phenylene, pyrazine-2,5-diyl, pyridazine-3,6-diyl, pyridine-2,5-diyl, pyrimidine-2,5-diyl, trans-1,4-cyclohexylene, 1,3,4-thiadiazole-2,5-diyl, 1,3-dioxane-2,5-diyl, 1,3-dithiane-2,5-diyl, 1,3-thiazole-2,4-diyl, 1,3-thiazole-2,5-diyl, thiophene-2,4-diyl, thiophene-2,5-diyl, piperazine-1,4-diyl, piperazine-2,5-diyl, naphthalene-2,6-diyl, bicyclo\x9b2.2.2!octane-1,4-diyl, or 1,3-dioxaborinane-2,5-diyl; M.sup.1 and M.sup.2 are identical or different and are --CO--O--, --O--CO--, --O--CO--O--, --O--CS--O--, --CH.sub.2 --O--, --O--CH.sub.2 --, --CH.dbd.CH--, --C.tbd.C-- or a single bond; R.sup.1 is --O-benzyl, H, an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms; m and n are 0 or 1. The novel compounds allow the synthesis of a wide range of 1,3,4-thiadiazole derivatives, as employed, for example, as components of liquid-crystal mixtures, in a significantly reduced number of synthesis steps.
公式(I)中的Thiadiazole衍生物 X-B-A.sup.1 -(M.sup.1 -A.sup.2 -).sub.m (M.sup.2 -A.sup.3).sub.n -R.sup.1(I ) ,其中符号和索引具有以下含义:X是Cl,Br或I;B是1,3,4-噻二唑-2,5-二基;A.sup.1,A.sup.2和A.sup.3相同或不同且是取代或未取代的1,4-苯撑,吡嗪-2,5-二基,吡嗪-3,6-二基,吡啶-2,5-二基,嘧啶-2,5-二基,反-1,4-环己基,1,3,4-噻二唑-2,5-二基,1,3-二氧杂环戊烷-2,5-二基,1,3-二硫杂环戊烷-2,5-二基,1,3-噻二唑-2,4-二基,1,3-噻二唑-2,5-二基,噻吩-2,4-二基,噻吩-2,5-二基,哌嗪-1,4-二基,哌嗪-2,5-二基,萘-2,6-二基,双环[2.2.2]辛烷-1,4-二基,或1,3-二氧硼杂环戊烷-2,5-二基;M.sup.1和M.sup.2相同或不同,是--CO--O--,--O--CO--,--O--CO--O--,--O--CS--O--,--CH.sub.2 --O--,--O--CH.sub.2 --,--CH.dbd.CH--,--C.tbd.C--或单键;R.sup.1是--O-苄基,H,具有1到12个碳原子的烷基或具有1到12个碳原子的烷氧基;m和n为0或1。这些新型化合物允许在显著减少合成步骤的情况下合成广泛的1,3,4-噻二唑衍生物,例如作为液晶混合物的组分。