124172-53-8Relevant articles and documents
Method for preparing hindered amine light stabilizer and method for preparing intermediate
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Paragraph 0051; 0052, (2017/11/18)
A method for preparing a hindered amine light stabilizer N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-N,N'-dialdehydo alkyl diamine comprises the steps of causing 4-formamido-2,2,6,6-tetramethyl-piperidine, dibromo alkane and a catalyst to be subjected to backflow stirring reaction for 1-24 h, instantly slowly adding water, cooling while stirring, performing washing, filtration and drying, and obtaining the product. A method for preparing an intermediate 4-formamido-2,2,6,6-tetramethyl-piperidine comprises the steps of causing 2,2,6,6-tetramethyl-piperidine, formamide, Lewis acid catalyst and an alkali-binding agent to undergo heating reaction for 1-24 h at normal pressure, performing cooling, alkaline wash, filtration, wash and drying. A synthesis process is simple and easy to operate, and aftertreatment is convenient; the required raw material, catalyst and solvent are easy to obtain, and the methods conform to the economy principle and is safe, environmentally friendly and high in product yield.
METHOD FOR THE PRODUCTION OF 4-FORMYLAMINOPIPERIDINE DERIVATIVES
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Page/Page column 7, (2010/07/04)
Method for producing 4-formylaminopiperidine derivatives of the formula (I) and also the acid addition salts of these compounds, comprising the reaction of 4-aminopiperidine derivatives of the formula (II) or the acid addition salts of these compounds in the presence of compounds of the formula (III) and the use of 4-formylaminopiperidine derivatives of the formula (I) produced in such a way for protecting inanimate organic material against the effect of light.
