羧酸与醇在酸催化下作用脱水或醇与酰基化试剂（酰氯、酸酐）作用均可用于酯的制备。
In order to get a convenient method for preparation of pyridazinone carboxylate, 1-aryl-1,4-dihydro-4-oxo-6-methyl pyridazine-3-carboxylic acids have been converted to alkyl esters in good yieds by heating them with dialkyl phosphite at 120～130 ℃ for 4 h.
为探索哒嗪酮羧酸酯的简便合成方法，通过亚磷酸二烷基酯与1-芳基-1,4-二氢-4-氧-6-甲基哒嗪-3-羧酸（摩尔比为2∶1）在120～130 ℃下共热4 h，得到7个收率63%～85%的哒嗪酸烷基酯。
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羧酸酯是重要的化工原料。
Carboxylic acid esters are important chemical raw materials.
目的：合成笼状双环磷酸酯的羧酸酯衍生物。
Aim: To synthesize carboxylate derivatives of caged bicyclic phosphate.
羧酸酯酶A2表达纯化及特征分析为其应用奠定了基础。
The study on the expression and characterization of carboxylesterase A2 in E. coli is more useful for its future application.
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