Basf Aktiengesellschaft

Eberhard Steckhan

Dieter Degner

Hermann Puetter

Reinhard Wolf

Karl H Grosse-Brinkhaus

Rainer Wienkamp

Chloro-olefins which contain a group of the formula ##STR1## where Y is chlorine or hydrogen, which are prepared by a process in which a trichloromethyl compound which contains a group of the general formula ##STR2## where X is hydrogen or an organic radical, is reduced with a chromium(II) salt in an aqueous medium.

Preparation of chloro-olefins

Preparation of aromatic carboxylic acid ortho-esters of the formula I ##STR1## where R is C.sub.1 -C.sub.4 -alkyl and R.sup.1 is H, halogen, alkyl, aryl, heteroaryl, alkoxy, aryloxy, acyl, acyloxy or CN, by electro-oxidizing benzene derivatives of the formula II ##STR2## where R.sup.2 is CH.sub.3 or CH(OR.sub.2), in the presence of an alcohol ROH, a halogenated triarylamine compound and a base, and novel ortho-trialkyl 4-tert-butoxybenzoates, where alkyl is of 1 to 4 carbon atoms. Ortho-trialkyl 4-tert-butoxybenzoates are scents and are also used to prepared p-hydroxybenzoic acid esters.

Preparation of benzoic acid ortho-esters and novel compounds of this type

Aromatic carboxylates are prepared by electrochemical oxidation of the corresponding methyl benzenes or benzaldehyde dialkyl acetals in the presence of an alkanol and of a halogenated triarylamine derivative.

Preparation of aromatic carboxylates

Nicotinamide adenine dinucleotide (NAD.sup..sym.) is electrochemically hydrogenated to NADH in aqueous solution and in the presence of a metal complex as an electron carrier.

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Meckenheim, Germany

Eberhard Steckhan