A series of new optically active poly（amide-imide）s were synthesized by direct polycondensation reaction of 4,4＇-diaminochalcone with several N-trimellitylimido-L-amino acids using a tosyl chloride （TsCl）, pyridi...A series of new optically active poly（amide-imide）s were synthesized by direct polycondensation reaction of 4,4＇-diaminochalcone with several N-trimellitylimido-L-amino acids using a tosyl chloride （TsCl）, pyridine （Py） and dimethylformamide （DMF） system as condensing agent. The resulting thermally stable poly（amide-imide）s were obtained in good to high yields and inherent viscosities ranging between 0.35 dL/g and 0.58 dL/g and were characterized with FTIR, IH-NMR, CHN, Ultraviolet, TGA and DTG techniques.展开更多
The reaction of a zerovalent nickel complex{Na}{(PNP)Ni(CO)}(1)with CO_(2)(g)results in the formation of a tetrameric cluster complex{(PN^(COONa)P)Ni(CO)_(2)}_(4)(2)as the major product along with{(PNP)Ni}_(2)-μ-CO_(...The reaction of a zerovalent nickel complex{Na}{(PNP)Ni(CO)}(1)with CO_(2)(g)results in the formation of a tetrameric cluster complex{(PN^(COONa)P)Ni(CO)_(2)}_(4)(2)as the major product along with{(PNP)Ni}_(2)-μ-CO_(3)-κ^(2)O,O(3),{(PNP)Ni}_(2)-μ-CO_(2)-κ^(2)C,O(4)and(PNP)Ni(CO)(5).A labelling experiment with ^(13)CO_(2)(g)reveals that not only the carbamate moeity but also the CO ligand in 2 originate from CO_(2)(g).The formation of both a carbonyl species 2 and a carbonate species 3 indicates that nickel-mediated reductive disproportionation of CO_(2) occurs.Alternatively,a direct CO_(2) oxidative reaction of 1 occurs to produce{(PNP)Ni}_(2)-μ-CO_(2)-κ^(2)C,O(4)in a minor pathway.The synthesis and characterization of 2 and other products are described herein.展开更多
文摘A series of new optically active poly（amide-imide）s were synthesized by direct polycondensation reaction of 4,4＇-diaminochalcone with several N-trimellitylimido-L-amino acids using a tosyl chloride （TsCl）, pyridine （Py） and dimethylformamide （DMF） system as condensing agent. The resulting thermally stable poly（amide-imide）s were obtained in good to high yields and inherent viscosities ranging between 0.35 dL/g and 0.58 dL/g and were characterized with FTIR, IH-NMR, CHN, Ultraviolet, TGA and DTG techniques.
基金supported by the Korea CCS R&D Center Grant funded by the Korea government(Ministry of Science,ICT&Future Planning,no.NRF-2014M1A8A1049353).
文摘The reaction of a zerovalent nickel complex{Na}{(PNP)Ni(CO)}(1)with CO_(2)(g)results in the formation of a tetrameric cluster complex{(PN^(COONa)P)Ni(CO)_(2)}_(4)(2)as the major product along with{(PNP)Ni}_(2)-μ-CO_(3)-κ^(2)O,O(3),{(PNP)Ni}_(2)-μ-CO_(2)-κ^(2)C,O(4)and(PNP)Ni(CO)(5).A labelling experiment with ^(13)CO_(2)(g)reveals that not only the carbamate moeity but also the CO ligand in 2 originate from CO_(2)(g).The formation of both a carbonyl species 2 and a carbonate species 3 indicates that nickel-mediated reductive disproportionation of CO_(2) occurs.Alternatively,a direct CO_(2) oxidative reaction of 1 occurs to produce{(PNP)Ni}_(2)-μ-CO_(2)-κ^(2)C,O(4)in a minor pathway.The synthesis and characterization of 2 and other products are described herein.
