Basf Aktiengesellschaft

Basf Se Corporation

Michael Drögemüller

Rainer Becker

Volker Schehlmann

Horst Westenfelder

Heinz-Josef Kneuper

Matthias Maase

Volker Bomm

Gerhard Bertlein

Helmut Gümbel

The present invention relates to a process for the preparation of N-phosphonomethyliminodiacetic acid by reacting an alkali metal salt of iminodiacetic acid with phosphorus trichloride in aqueous solution with formation of the hydrochloride of iminodiacetic acid, phosphorous acid and of the corresponding alkali metal chloride, followed by reaction with a formaldehyde source and, if desired, recovery of the N-phosphonomethyliminodiacetic acid from the reaction mixture, in which water, which may comprise HCl, is removed from the reaction mixture during and/or after reacting the alkali metal salt of iminodiacetic acid with phosphorus trichloride until the concentration of iminodiacetic acid hydrochloride is at least 40% by weight, based on the weight of the reaction mixture minus the weight of alkali metal chloride. The process makes possible the preparation of N-phosphonomethyliminodiacetic acid in a simple fashion and in high yield.

Method for producing n-phosphonomethyl iminodiacetic acid

The invention relates to a method for producing the tautomeric form (I) of 2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1&#x2032;-oxy)-1,3,5-triazine by the crystallization of a tautoner mixture in the presence of one or more solvents selected from the group consisting of aliphatic alcohol having 2 8 C-atoms made of aliphatic alcohol, aliphatic carboxylic acid alkyl esters having a total of between 3&#x2013;10 C-atoms, aromatic carboxylic acid alkyl esters having a total of between 8&#x2013;12 C-atoms, aliphatic carboxylic acid esters having a total of between 3 9 C-atoms, carboxylic acid nitriles having a total of between 2&#x2013;8 C-atoms, dialkylketones having a total of between 3&#x2013;6 C-atoms and aliphatic sulphones having a total of between 3&#x2013;6 C-atoms. The solvent or solvent mixture can additionally contain up to 30 wt % of a hydrocarbon (I) acts as a light protecting agent in cosmetic preparations.

Method for producing the tautomeric form of (1) of 2,4,6-trianilino-p-(carbo-1'-ethylhexyl-1&#x2032;oxyl)-1, 3, 5-triazine

Arylaminomethylenecamphor derivatives of the formula (1) ##STR1## where the C.dbd.C double bond is in the Z or E configuration, and the variables have the following meanings:

Arylaminomethylenecamphor derivatives

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Mannheim, Germany

Michael Drögemüller