The regioselective nitration of toluene and chlorobenzene with nitrates and supported nitrates on solid acid catalysts and supports in the presence of acetic anhydride is studied.

该文讨论了应用固体酸催化剂和载体，在醋酐存在下，采用硝酸盐和载体硝酸盐硝化甲苯和氯苯的选择性。

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METHODS: Potentiometric titration was adopted to determine the content of terbinafine hydrochloride using glacial acetic acid as solvent, acetic anhydride instead of mercury acetate.

方法：采用电位滴定法，以冰醋酸为溶剂，用适量醋酐代替现行标准中使用的醋酸汞，建立了测定盐酸特比萘芬原料药含量的方法；

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Sulfuric acid and acetic anhydride were used as a cyclizing agent to prepare Ofloxacin intermediate. The reaction could be carried out under moderate conditions and facilitate industrial produce.

用硫酸乙酐混合物作环合剂，制备了氟嗪酸中间体．该方法具有反应条件温和、价格便宜、后处理简单的优点，适用于工业化生产。

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It is heated to start the reaction, and when it is complete the resins, residual acetic anhydride and acetic acid are wicked away from the wood, and the pine has become Accoya.

BBC: Rice, straw and coconut the new alternatives to wood