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4 - ( N - benzyl -N- methylamino) pyridine resin catalyst and its catalytic acylation reaction

Author: LiuFengWu
Tutor: CaoShaoKuiï¼›LiuHongMin
School: Zhengzhou University
Course: Materials Science
Keywords: Chloromethylated Nucleophilic substitution Immobilized catalyst Catalytic activity
CLC: TQ426.94
Type: Master's thesis
Year: 2001
Downloads: 91
Quote: 0
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Abstract


The subject on the basis of extensive research on relevant literature , combined with the status quo of China 's production of raw materials , selection of cross-linked polystyrene and 4 - aminopyridine was synthesized immobilized 4 - ( N - benzyl - methyl -N - methyl- amino) pyridine ( BMAPR ) catalyst. In the presence of anhydrous ZnCl 2 the chloromethyl ether -linked polystyrene reaction , get chloromethylated crosslinked polystyrene ( CMCPS ) . Then treated with sodium hydride to the amino nitrogen atom of 4 - aminopyridine molecule nucleophilic activity increased , so that it occurs preferentially nucleophilic substitution reaction of 4 - aminopyridine , under this condition , in turn , with a methylating reagent , CMCPS The chloromethyl role in the system BMAPR catalyst . After preliminary trial found that the catalyst for the alcohol , amine acetylated catalytic activity significantly ( except bulky substrate ) , the catalytic activity for certain reactions or exceed the field of organic synthesis \). To find out 4 - aminopyridine nucleophilic substitution reaction mechanism , synthetic small molecule model compounds and their structures were identified . The results show that , in general under the reaction conditions , the preferred position of 4 - aminopyridine nucleophilic substitution reaction is the 1-position of the ring nitrogen atoms ; only in the presence of the super base NaH , the reaction can occur on the exocyclic nitrogen atom .

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