- An ultraviolet absorbent preparation method (by machine translation)
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The invention relates to an ultraviolet-absorbing agent preparation method, comprises the following steps: (1) D. amide esters intermediate synthesis: to oxalyl chloride ethyl ester and O-ethyl aniline as the raw material, the oxalyl chloride ethyl ester dissolved in a solvent, heating the stirring, then instillment neighbour ethyl aniline, after the reaction water elution solvent, to obtain D. amide esters intermediate; (2) N - (2 - ethoxy) - N' - (4 - ethyl-phenyl) - ethylenediamine amide product synthesis: in order to O-phenetidine and steps (1) obtained in the D. amide esters intermediate as raw materials, to Lewis base as catalyst, the temperature of the stirring, the reaction after 120 - 170 °C lower, boil off ethanol byproducts, cooling, is poured into the methanol stirring and dissolving, filtering out the insoluble matter, the temperature crystallization mother liquor, filtration, and dried to obtain the product. The preparation method, the process is simple, low requirements on equipment; the product has high purity, high yield, three wastes, environmental protection, low production cost, is suitable for industrial production. (by machine translation)
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Page/Page column 5-7
(2019/10/29)
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- 4-Formyl amino-n-methylpiperidine derivatives, the use thereof as stabilisers and organic material stabilised therewith
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The present invention relates to 4-formylamino-N-methylpiperidine derivatives of the formula (I) where the variables are as defined in the Description, to a process for preparing these piperidine derivatives, to the use of these piperidine derivatives of the invention, or prepared according to the invention, for stabilizing organic material, in particular for stabilizing plastics or coating materials, and also to the use of these piperidine derivatives of the invention, or prepared according to the invention, as light stabilizers or stabilizers for wood surfaces. The present invention further relates to stabilized organic material which comprises these piperidine derivatives of the invention or prepared according to the invention.
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