Organic compounds -- part of the class 532-570 series – Organic compounds – Four or more ring nitrogens in the bicyclo ring system
Reexamination Certificate
2006-07-11
2006-07-11
Balasubramanian, Venkataraman (Department: 1624)
Organic compounds -- part of the class 532-570 series
Organic compounds
Four or more ring nitrogens in the bicyclo ring system
C424S401000
Reexamination Certificate
active
07074922
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.
REFERENCES:
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patent: 35 18670 (1986-11-01), None
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Advances in Heterocyclic Chemistry, Supplement 1, The Tautomerism of Heterocycles, Academic Press New York, 1976, Kp 2, S. 168.
Becker Rainer
Bertlein Gerhard
Drögemüller Michael
Gümbel Helmut
Kneuper Heinz-Josef
Balasubramanian Venkataraman
BASF - Aktiengesellschaft
Novak Druce & Quigg LLP
Voight Jason D.
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