Preparation method of 2- benzo [c] furanone: (a) in the presence of a free radical initiator in an inert organic solvent using sulfonyl chloride or chlorine chloride - part o methyl benzoic acid to form 2- chloro methyl benzoic acid and unreacted o-methylbenzoate reaction mixture; (b) using a mixture of water the reaction solution of saline, 2- chlorine methyl benzoic acid into 2- benzo [c] furan ketone, and the formation of o-methylbenzoate unreacted salts; (c) by phase separation technique to isolate 2- benzo [c] furanone, 2- and [c] dissolved in benzene Furaneol does not mix with water there organic solvents, o-toluic acid salt dissolved in aqueous solution; (d) by controlling the acidified water solution Lin Jiaji benzoate is converted to methyl benzoic acid and extraction solvent. The invention has the advantages of simple operation, good product quality and easy industrialization. The cost is remarkably reduced, the conversion rate is good, the yield is relatively high, and the risk of hydrogenation at high temperature and high pressure is avoided. ?
【技术实现步骤摘要】
【技术保护点】
一种2-苯并[c]呋喃酮的制备方法,其特征在于,步骤如下:(a)在自由基引发剂存在下、在惰性有机溶剂中使用磺酰氯或氯气,部分氯化邻-甲基苯甲酸形成2-氯甲基苯甲酸和未反应的邻甲基苯甲酸的反应混合物;(b)使用成盐碱的水溶液处理来自步骤(a)的反应混合物,将2-氯甲基苯甲酸转化为2-苯并[c]呋喃酮,并形成未反应的邻甲基苯甲酸的盐;(c)通过相分离技术从步骤(b)所得到的邻甲基苯甲酸的盐中分离出2-苯并[c]呋喃酮,2-苯并[c]呋喃酮溶解于与水不混溶的有机溶剂中,而邻甲基苯甲酸盐溶解于水溶液中;以及(d)通过控制的酸化由步骤(c)分离出来的水溶液,将分离出来的邻甲基苯甲酸盐 ...
【技术特征摘要】
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【专利技术属性】
技术研发人员:于康平,李泽方,徐昶辉,徐韶康,
申请(专利权)人:江苏耘农化工有限公司,
类型:发明
国别省市:32
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