Process for the preparation of 6-oxo-(6H)-dibenz-(c,e)(1,2)-oxaphosphorines
The prodn. of 6-oxo-(6H)-dibenz-Äc,eÜÄ1,2Ü-oxa- phosphorines (ODOP) of formula (I) comprises (1) reaction of o-phenylphenols of formula (II) with PCl3 in presence of Lewis acids at 70-220 degrees C with cleavage of HCl, followed by (2) hydrolysis of the prod. (CDOP); R -R = H, halogen, 1-4 C alkyl o...
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Zusammenfassung: | The prodn. of 6-oxo-(6H)-dibenz-Äc,eÜÄ1,2Ü-oxa- phosphorines (ODOP) of formula (I) comprises (1) reaction of o-phenylphenols of formula (II) with PCl3 in presence of Lewis acids at 70-220 degrees C with cleavage of HCl, followed by (2) hydrolysis of the prod. (CDOP); R -R = H, halogen, 1-4 C alkyl or 1-4 C alkoxy. Stage (2) involves continuously feeding CDOP and water in at least stoichiometric mole ratio into a reaction section at elevated temp. with the smallest possible amt. of back-mixing, carrying out the hydrolysis continuously along this section at elevated temp., removing the reaction prods. continuously at the end of the section, and opt. subjecting the ODOP to further treatment at elevated temp.. |
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