6-Chloro-1,2,3-benzodithiazolium chlorides 1 (Herz salts) react with malononitrile to afford the highly coloured ylidenes 2 in low to moderate yields. The reaction is general but complex and in the case of the 6-chloro-4-methoxy-1,2,3-benzodithiazolium chloride 1e the by-products 6-chloro-4-methoxy-1,3-benzothiazole-2-carbonitrile 3, 6-chloro-4-methoxy-2,3-dihydro-1,3-benzothiazole-2,2-dicarbonitrile 4, and 4-methoxy-6-thiocyanato-1,3-benzothiazole-2-carbonitrile 5 were also isolated.
6-
氯-1,2,3-苯并二
噻唑氯化物1(赫兹盐)与
丙二腈反应,以低至中等产率得到高度着色的亚甲基化合物2。该反应具有普遍性,但复杂性较高。在6-
氯-4-甲氧基-1,2,3-苯并二
噻唑氯化物1e的情况下,还分离出了副产物6-
氯-4-甲氧基-1,3-
苯并噻唑-2-
氰化物3、6-
氯-4-甲氧基-2,3-二氢-1,3-
苯并噻唑-2,2-二
氰化物4和4-甲氧基-6-
硫氰酸基-1,3-
苯并噻唑-2-
氰化物5。