| 摘要 |
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 car ried out on a commercial scale, more simply and more che aply than previously, as a one-pot reaction without isolating intermediate produc ts and avoiding a distillation step, with said process c omprising 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 hydrol ysed, being mixed first with water and then with a low alkanol; (c) next, the product is crystallised during further stirring; and (d) the cryst alline product obtained is sucked off, washed and dried. Furthermore, the invention relates to a commercial mixture thus prepared to produc e copolycondensable flameproofing agents for polyester fibres by directly reac ting the mixture with itaconic acid or itaconic acid com pounds, optionally together with one or more diols.
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