申请人:PRABHU SITARAM VAIKUNTH
公开号:US20070004937A1
公开(公告)日:2007-01-04
The present invention provides methods for the preparation of aralkyl phosphonic acids and aryl phosphonic acids. In a first method of the invention, an aralkyl dialkyl phosphonate is contacted with an aqueous acidic solution under reflux conditions. Upon cooling, solid crystals of the corresponding aralkyl phosphonic acid are obtained, which can be collected via filtration. In a second method of the invention, an aryl phosphorous dihalide is added to a pot containing an aqueous nitric acid solution while maintaining the pot temperature below about 50° C. and then allowing the reactants to self-reflux. Upon cooling, crystals of the corresponding aryl phosphonic acid are obtained, which can be collected via filtration.
本发明提供了制备芳基磷酸和芳基磷酸的方法。在本发明的第一种方法中,将芳基二烷基膦酸酯与水酸性溶液在回流条件下接触。冷却后,得到相应的芳基磷酸的固体晶体,可以通过过滤收集。在本发明的第二种方法中,将芳基磷二卤代物加入含有硝酸的罐中,同时保持罐的温度低于约50°C,然后允许反应物自行回流。冷却后,得到相应的芳基磷酸的晶体,可以通过过滤收集。