申请人:Hoechst Aktiengesellschaft
公开号:US04481151A1
公开(公告)日:1984-11-06
Dialkylphosphinic acid halides are prepared by reaction of dialkylphosphinic anhydrides with hydrogen halide at temperatures of from about 140.degree. to 250.degree. C. The hydrogen halide--preferably hydrogen chloride or bromide--is advantageously introduced in excess at a rate of from about 3 to 10 mols per mol of dialkylphosphinic anhydride an hour into the anhydride which is liquid or dissolved in an inert solvent. The reaction products are mainly intermediates in the field of plant protection and flameproofing agents.
二烷基膦酸卤化物是通过将二烷基膦酸酐与氢卤酸在约140℃至250℃的温度下反应制备而成。氢卤酸(优选氢氯酸或氢溴酸)优势地以每小时约3至10摩尔的速率过量引入液态或溶解在惰性溶剂中的酐中。反应产物主要是植物保护和阻燃剂领域的中间体。