2－甲基－6－溴苯并碲唑及其衍生菁染料的合成  

Synthesis of 2-Methyl-6-bromobenzotellurazole and Derived Cyanine Dyes

作　　者：罗学红[1] 刘秀芳[1] 徐汉生[1] 

机构地区：[1]武汉大学化学系

出　　处：《高等学校化学学报》1995年第8期1224-1228,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金;国家教育委员会博士学科点专项科研基金

摘　　要：以对溴苯胺为原料，经汞化、酰化，再与四氯化碲发生亲电取代反应生成２－乙酰氨基－５－溴苯基三氯化碲（内盐）；后者以硼氢化钠还原、浓盐酸关环，用碳酸氢钠中和后即得关键中间体２－甲基－６－溴苯并碲唑。苯并碲唑经碘甲烷或碘乙烷季铵化后，用原甲酸三乙酯缩合制得相应的对称染料２，２＇－二甲基－５，５＇－二溴碲碳菁碘盐和２，２＇－二乙基－５，５＇－二溴碲碳菁碘盐。测定了它们的可见吸收光谱．The inner salt 2-acetamido-5-bromophenyl tellurium trichloride was synthesizedfrom p-bromoaniline by mercuration,acetylation and electrophilic substitution of tellurium tetrachloride successively.Reduction of the above salt with sodium borohydride followed by cyclization with concentrated hydrochloride and neutralization with sodium bicarbonate gave the key intermediate 2-methyl-6-bromobenzotellurazole. The latter was alkylated with methyl or ethyl iodide and then condensed with ethyl orthoformate to give two symmetric telluracarbocyanine dyes. The visible absorption of the dyes was also measured.

关 键 词：苯并碲唑 菁染料 光谱增感剂 

分 类 号：TQ614.4[化学工程—精细化工]