Treatment of difluorodiiodomethane with N sodium salts of imidazoles at -15 ℃ gave N difluoroiodomethylated imidazoles (3) in good yields. The addition of 3 to alkyne or alkenes initiated by sodium dithiona...Treatment of difluorodiiodomethane with N sodium salts of imidazoles at -15 ℃ gave N difluoroiodomethylated imidazoles (3) in good yields. The addition of 3 to alkyne or alkenes initiated by sodium dithionate at room temperature resulted in the corresponding adducts in high yields.展开更多
Heating a mixture of 1, 3-diiodo-1 ,1,3, 3-tetrafluoropropane (2), K2CO3, pyridinium bromides (3) in CH3CN at 65℃ for 10 h gives the corresponding trifluoromethylindolizines.
Aldol reaction between simple benzaldehydes and ketones successfully happened in solvent- and catalyst-free condition. The desired products were obtained in moderate yield at suitable temperature. Heat was assumed as ...Aldol reaction between simple benzaldehydes and ketones successfully happened in solvent- and catalyst-free condition. The desired products were obtained in moderate yield at suitable temperature. Heat was assumed as the driving force for the reaction. This approach has obvious advantages to fully meet the requirement of the principles of green chemistry.展开更多
基金Project supported by the National Basic Research Program of China(973 Program,No.2015CB931903)the National Natural Science Foundation of China(Nos.21421002,21472222,21502214,21672242)the Chinese Academy of Sciences(Nos.XDA02020105,XDA02020106),and the Key Research Program of Frontier Sciences(CAS)(No.QYZDJSSW-SLH049)~~
文摘Treatment of difluorodiiodomethane with N sodium salts of imidazoles at -15 ℃ gave N difluoroiodomethylated imidazoles (3) in good yields. The addition of 3 to alkyne or alkenes initiated by sodium dithionate at room temperature resulted in the corresponding adducts in high yields.
基金Project supported by the National Natural Science Foundation of China(Nos.20272076 and D20032010).
文摘Heating a mixture of 1, 3-diiodo-1 ,1,3, 3-tetrafluoropropane (2), K2CO3, pyridinium bromides (3) in CH3CN at 65℃ for 10 h gives the corresponding trifluoromethylindolizines.
基金Project supported by the Chinese Academy of Sciences （Hundreds of Talents Program） and the National Natural Science Foundation fo China （No. 20972179）.
文摘Aldol reaction between simple benzaldehydes and ketones successfully happened in solvent- and catalyst-free condition. The desired products were obtained in moderate yield at suitable temperature. Heat was assumed as the driving force for the reaction. This approach has obvious advantages to fully meet the requirement of the principles of green chemistry.
文摘利用原子转移自由基聚合(ATRP)方法,分别在三氟甲苯、含氟离子液体以及三氟甲苯/含氟离子液体混合溶剂体系中合成了聚苯乙烯-co-聚(2,3,4,5,6-五氟苯乙烯)(PS-co-PPFS)共聚物,通过1H NMR、19F NMR、元素分析以及凝胶渗透色谱法(GPC)对所得聚合物的分子链结构和组成进行了分析和表征.随后,利用静态呼吸图法分别在CS2,CHCl3和CH2Cl2中制备了有序多孔薄膜,用扫描电子显微镜(SEM)观察其表面形貌,并与利用分子量大小相当的聚苯乙烯均聚物(PS)制备的多孔薄膜进行了对比.研究结果表明:在三氟甲苯和含氟离子液体溶剂体系中,均可利用ATRP聚合方法获得窄分子量分布的PS-co-PPFS共聚物(Mn=5200～7900 g mol-1,Mw/Mn=1.12～1.22).对聚合物薄膜的扫描电子显微镜(SEM)观察和分析显示:分别以CS2,CHCl3和CH2Cl2作为溶剂,利用静态呼吸图法均可制备出PS-co-PPFS共聚物多孔薄膜.然而,与在CHCl3和CH2Cl2中制备的PS均聚物多孔薄膜的表面形貌不同的是,PS-co-PPFS共聚物多孔薄膜呈现出无序排列、平均孔径大小不同的两种孔结构;在CHCl3中制备所得薄膜的孔结构有序性相对较好,两种孔的平均孔径分别为0.75和0.37μm.
