The preparation of 2,4,6-trinitrophenyl (picryl) derivatives of triazine, pyrimidine, thiophene, furan, thiazole, 1,3,4-oxadiazole and 1,3,4-thiadiazole is described. The picryl derivatives are prepared by the Ullmann reaction and by cyclization reactions to form the heterocyclic ring.

中文翻译：

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杂环化合物2,4,6-三硝基苯基衍生物的合成

描述了三嗪，嘧啶，噻吩，呋喃，噻唑，1,3,4-恶二唑和1,3,4-噻二唑的2,4,6-三硝基苯基（吡啶）衍生物的制备。通过乌尔曼（Ullmann）反应和通过环化反应形成杂环来制备苦基衍生物。