| 摘要 |
<p>The invention relates to a process for the preparation of 2'-hydroxydephenyl-2-phosphinic acid in the form of a commercial mixture with 6-hydroxy-(6H)-dibenzo-(c,e)(1,2)-oxaphosphorine, the process being carried out on a commerical scale, more simply and more cheaply than previously, as a one-pot reaction without isolating intermediate products and avoiding a distillation step, with said process comprising the steps: (a) o-phenylphenol is added to a mixture of PCl3 and a Lewis acid as a catalyst while simultaneously heating the reaction mixture, and the reaction mixture is then fluxed; (b) the resulting reaction mixture is allowed to cool and, stirring continuously, is hydrolysed, being mixed first with water and then with a low alkanol; (c) next, the product is crystallised during further stirring; and (d) the crystalline product obtained is sucked off, washed and dried. Furthermore, the invention relates to a commercial mixture thus prepared to produce copolycondensable flameproofing agents for polyester fibres by directly reacting the mixture with itaconic acid or itaconic acid compounds, optionally together with one or more diols.</p> |
