Basf Aktiengesellschaft

Ursula Mueller

Bernhard Hauer

Wolfgang Ladner

Joachim Meyer

Uwe Pressler

Horst Ralf Staudenmaier

Hardo Siegel

The present invention relates to a novel process for the preparation, by fermentation, of compounds of the formula I ##STR1## where R.sup.1 is hydrogen, fluorine, chlorine or bromine.

Fermentative preparation of 2,5-dihydroxyphenylacetic acid with Beauveria

A process for hydroxylating compounds of the formula ##STR1## where n, A and R.sup.1 to R.sup.4 have the meanings stated in the description, with the aid of microorganisms of the genus Beauveria.

Process for the hydroxylation of aromatic acids using strains of the

2-hydroxyphenylacetic acid is prepared from phenylacetic acid by fermentation with suitable microorganisms.

Preparation of 2-hydroxyphenylacetic acid by fermentation

The invention relates to a novel process for preparing 3-hydroxyphenylacetic acid by cultivating a fungus of the genus Rhizoctonia, Ceratobasidium and Pellicularia in the presence of a phenyl compound of the formula I ##STR1## where X is COOR, CH.sub.2 OH, CH.sub.2 NH.sub.2 or ##STR2## R is methyl, ethyl, hydrogen, sodium, potassium or ammonium.

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Fussgoenheim, Germany

Ursula Mueller