目的建立溴芬酸钠原料中二氯甲烷、甲苯、1，2-二甲氧基乙烷、乙酸乙酯、乙醇残留量测定方法。

Objective To establish a method for detection of dichloromethane, 1,2-dimethoxyethane, toluene, ethyl acetate and ethanol in bromfenac sodium.

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前言：以邻苯二酚和二氯甲烷为原料，二甲亚砜为溶剂，在碱性条件下合成1，2-亚甲二氧基苯，产品收率达到73.4%；

2-(methylenedioxy)benzene is synthesized by using catechol, dichloromethane and dimethylsulfoxide with the condition of alkali and normal pressure. Overall yield of the process is 73.4%.

youdao

前言：以邻苯二酚和二氯甲烷为原料，二甲亚砜为溶剂，在碱性条件下合成1，2-亚甲二氧基苯，产品收率达到73.4%；

2-(methylenedioxy)benzene is synthesized by using catechol, dichloromethane and dimethylsulfoxide with the condition of alkali and normal pressure. Overall yield of the process is 73.4%.

youdao