The surface of lignite has been modified with alkylcarboxylic moieties derived from alkyl halides by diverting the reactivity of the sterically hindered aryl radical obtained by reduction of the 2,6-dimethylbenzene diazonium tetrafluoroborate after its chemical reduction. Mixed alkyl-aryl layers are prepared by using 4-nitro or 3,5-bis-trifluoro benzenediazonium salts.

中文翻译：

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用芳基重氮盐和烷基卤化物生成的烷基和混合烷基芳基薄膜对褐煤进行表面改性：实验结果和理论分析

通过转移2,6-二甲基苯重氮四氟硼酸盐化学还原后所获得的空间位阻芳基的反应性，用衍生自烷基卤化物的烷基羧基部分对褐煤表面进行改性。混合烷基-芳基层通过使用4-硝基或3,5-双-三氟苯重氮盐来制备。