Method for producing the tautomeric form of (1) of 2,4,6-trianilino-p-(carbo-1′-ethylhexyl-1′oxyl)-1, 3, 5-triazine

US7074922B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Helmut Gumbel · Dannenfels, DE
• Heinz-Josef Kneuper · Mannheim, DE
• Rainer Becker · Bad Dürkheim, DE
• Gerhard Bertlein · Trochtelfingen, DE
• Michael Drogemuller · Uelzen, DE

Key dates

• Filing date: Feb 26, 2003
• Grant date: Jul 11, 2006
• Expiry date: Feb 26, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D251/70
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing the tautomeric form (I) of 2,4,6-trianilino-p-(carbo-2′-ethylhexyl-1′-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 3–10 C-atoms, aromatic carboxylic acid alkyl esters having a total of between 8–12 C-atoms, aliphatic carboxylic acid esters having a total of between 3 9 C-atoms, carboxylic acid nitriles having a total of between 2–8 C-atoms, dialkylketones having a total of between 3–6 C-atoms and aliphatic sulphones having a total of between 3–6 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.