N-alkyl chitosan was prepared by reducing a schiff base formed from chitosan and lauraldehyde,and microwave irradiation was applied to the preparation of N-alkyl chitosan.The effects of microwave power,irradiation tim...N-alkyl chitosan was prepared by reducing a schiff base formed from chitosan and lauraldehyde,and microwave irradiation was applied to the preparation of N-alkyl chitosan.The effects of microwave power,irradiation time,amount of catalyst,and n(chitosan)/n(aldhyde) ratio on the degree of alkylation substitution of(chitosan) were studied.The modified chitosan was characterized by FTIR and EA.The substitution(degree) of the modified chitosan can reach 94% under the following reaction conditions:560 W microwave(power),3 min reaction time,reactant ratio(n(chitosan)/n(lauraldehyde)) of 1∶[KG-*3/5]2.6,and molar ratio of SDS to(lauraldehyde)(being) 0.15∶[KG-*3/5]1. Compared to(ordinary) reactions,the preparation of N-alkyl chitosan by microwave irradiation can be finished within very short reaction time.展开更多
本文以四丁基溴化铵为相转移催化剂、硫酸二甲酯为烷基化剂,通过2-甲基吲哚进行N-甲基化,合成1,2-二甲基吲哚,并用T. L. C. (Thin Layer Chromatography)跟踪反应全过程。研究了薄层层析分离的有效展开剂组成及烷基化剂用量、相转移催...本文以四丁基溴化铵为相转移催化剂、硫酸二甲酯为烷基化剂,通过2-甲基吲哚进行N-甲基化,合成1,2-二甲基吲哚,并用T. L. C. (Thin Layer Chromatography)跟踪反应全过程。研究了薄层层析分离的有效展开剂组成及烷基化剂用量、相转移催化剂用量、反应时间对反应的影响,探索了1,2-二甲基吲哚较佳的合成条件。展开更多
文摘N-alkyl chitosan was prepared by reducing a schiff base formed from chitosan and lauraldehyde,and microwave irradiation was applied to the preparation of N-alkyl chitosan.The effects of microwave power,irradiation time,amount of catalyst,and n(chitosan)/n(aldhyde) ratio on the degree of alkylation substitution of(chitosan) were studied.The modified chitosan was characterized by FTIR and EA.The substitution(degree) of the modified chitosan can reach 94% under the following reaction conditions:560 W microwave(power),3 min reaction time,reactant ratio(n(chitosan)/n(lauraldehyde)) of 1∶[KG-*3/5]2.6,and molar ratio of SDS to(lauraldehyde)(being) 0.15∶[KG-*3/5]1. Compared to(ordinary) reactions,the preparation of N-alkyl chitosan by microwave irradiation can be finished within very short reaction time.
文摘本文以四丁基溴化铵为相转移催化剂、硫酸二甲酯为烷基化剂,通过2-甲基吲哚进行N-甲基化,合成1,2-二甲基吲哚,并用T. L. C. (Thin Layer Chromatography)跟踪反应全过程。研究了薄层层析分离的有效展开剂组成及烷基化剂用量、相转移催化剂用量、反应时间对反应的影响,探索了1,2-二甲基吲哚较佳的合成条件。
