Hoechst Aktiengesellschaft

Karl Rehn

Hans J Nestler

Gerhard Stahler

Klaus H Kaiser

Klaus Dehmer

Werner Becker

Otto Schaffner

Continuous process for the preparation of hydroxyphenoxy-alkanecarboxylic acids of the formula ##STR1## in which A is alkylene, by reaction of dihydroxybenzenes with alpha-haloalkanecarboxylic acids of the formula

Process for the preparation of hydroxyphenoxy-alkanecarboxylic acids

Substituted 4-phenoxy-phenols are prepared by adding the corresponding anilines in liquid or molten state together with aqueous sodium nitrite solution in equimolar amounts to excess HCl and introducing the diazonium chloride solution obtained into a boiling mixture of about half-concentrated H.sub.2 SO.sub.4 and an aromatic hydrocarbon.

Process for the preparation of 4-phenoxy-phenols

An improved process for the manufacture of 2-chloroethane phosphonic acid in which 2-chloroethane phosphonic acid bis(2-chloroethyl)-ester is heated with excess hydrogen chloride in the presence of 0.1 to 31% by weight of water at temperatures above 100.degree. C under pressure, the 1,2-dichloroethane formed during the reaction is continuously or discontinuously distilled off and the decrease in pressure is compensated by adding gaseous hydrogen chloride.

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Hofheim, Germany

Karl Rehn