Atom transfer radical polymerization （ATRP） of methyl methacrylate （MMA） was achieved, using N-chlorosuccinimide （NCS） as an initiator together with catalytic system CuCl/PMDETA （N,N,N＇,N＇,N＂-pentamethyldiet...Atom transfer radical polymerization （ATRP） of methyl methacrylate （MMA） was achieved, using N-chlorosuccinimide （NCS） as an initiator together with catalytic system CuCl/PMDETA （N,N,N＇,N＇,N＂-pentamethyldiethylenetriamine）, CuCl/MA5-DETA （N,N＇,N＇,N＂-penta（methylacrylate）diethylenetriamine）, and CuCl/bipy （bipy= 2,2＇-bipyridyl） respectively. The results indicated that the polymerization possessed typical controlled/living radical polymerization characteristics. The analysis for terminal group of obtained polymer by ^1H NMR proved that NCS is an initiator for ATRP. In comparison with NBS, the polymerization rate was slower and the resulted polymer had narrower molecular weight distribution （MWD） when NCS was employed as the initiator.展开更多
A simple and efficient protocol for the electrophilic thiocyanation of indoles and aromatic amines with thiourea/NCS/NH4SCN system has been developed. The major features of the present procedure are the mild condition...A simple and efficient protocol for the electrophilic thiocyanation of indoles and aromatic amines with thiourea/NCS/NH4SCN system has been developed. The major features of the present procedure are the mild conditions, good yields, short reaction times, and the use of inexpensive and readily available organocatalyst. Moreover, N-chlorosueeinimide （NCS） was found to be indispensable, and thiourea could greatly promote the reaction.展开更多
基金Project supported by the National. Natural Science Foundation of China （Nos. 20474042 and 20574049）. Dedicated to Professor Xikui Jiang on the occasion of his 80th birthday.
文摘Atom transfer radical polymerization （ATRP） of methyl methacrylate （MMA） was achieved, using N-chlorosuccinimide （NCS） as an initiator together with catalytic system CuCl/PMDETA （N,N,N＇,N＇,N＂-pentamethyldiethylenetriamine）, CuCl/MA5-DETA （N,N＇,N＇,N＂-penta（methylacrylate）diethylenetriamine）, and CuCl/bipy （bipy= 2,2＇-bipyridyl） respectively. The results indicated that the polymerization possessed typical controlled/living radical polymerization characteristics. The analysis for terminal group of obtained polymer by ^1H NMR proved that NCS is an initiator for ATRP. In comparison with NBS, the polymerization rate was slower and the resulted polymer had narrower molecular weight distribution （MWD） when NCS was employed as the initiator.
基金This project was financially supported by the National Natural Science Foundation of China （No. 21302014）.
文摘A simple and efficient protocol for the electrophilic thiocyanation of indoles and aromatic amines with thiourea/NCS/NH4SCN system has been developed. The major features of the present procedure are the mild conditions, good yields, short reaction times, and the use of inexpensive and readily available organocatalyst. Moreover, N-chlorosueeinimide （NCS） was found to be indispensable, and thiourea could greatly promote the reaction.
