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Process for preparation of UV absorbers

A compound and selected technology, applied in organic chemistry and other fields, can solve problems such as difficult to separate impurities

Pending Publication Date: 2021-08-13
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have the problem that they lead to the formation of impurities that are difficult to separate
Impurities react in subsequent steps and in turn lead to the formation of undesired by-products

Method used

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  • Process for preparation of UV absorbers
  • Process for preparation of UV absorbers
  • Process for preparation of UV absorbers

Examples

Experimental program
Comparison scheme
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Embodiment

[0515] The invention will be described in detail by the following non-limiting operational examples. More specifically, the test method described below is a portion of the general disclosure of the present application and is not limited to the specific operational examples.

[0516] Material:

[0517] Trichlorotrine, o-dichlorobenzene, N, N-dimethylformamide, amphibenyphenol, biphenyl, xylene, α-bromopropate mixture, bromohexane, etc., SIGMA Aldrich.

[0518] Synthesis 2-amino-4,6-chloro-1,3,5-triazine (C1):

[0519] Trichrazine (20 g, 0.108 mol) was added to 100 g of dipyrice in water under stirring. 22 g 25% by weight of an aqueous solution was added to the above suspension while maintaining a temperature below 0 ° C. The suspension was stirred until the temperature reached 5 ° C and filtered. The crude product was recrystallized from water and dried at room temperature to give a compound of formula (C1). Yield: 16 g (89%), white solid.

[0520] Synthesis of 4,6-di (4-phenylphen...

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Abstract

The presently claimed invention relates to a novel, highly efficient and general process for the preparation of UV absorbers.

Description

[0001] Invention [0002] The present invention relates to a novel, highly effective general method for preparing UV absorbers. [0003] Inventory background [0004] Triazine UV absorbers are an important organic compound having a wide range of applications. One of the most important applications is to protect and stabilize organic materials such as plastics, polymers, coatings, and photographic materials to prevent light, heat, oxygen or environmental force. Other applications include cosmetics, fibers, dyes, etc. [0005] The triazide-based UV absorbent is typically at least one 2-oxyfactorgyl substituent on the 1,3,5-triazine ring. 2-, 4- and 6-positions of 1,3,5-triazine have an aromatic substituent and having at least one triazide-based UV absorbent compound of an aromatic ring substituted with a hydroxyl group or a closed hydroxyl group. It is usually a preferred compound. [0006] Several methods of preparing a triazine-based UV absorber (see H. Brunetti and Celuethi, 1972, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/24
CPCC07D251/24
Inventor R·加格M·帕特尔P·科拉姆卡尔M·卡达姆D·马卡德R·巴塔
Owner BASF AG