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Organomontmorillonites Modified with 2-Methacryloyloxy Ethyl Alkyl Dimethyl Ammonium Bromide
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作者 王建全 吴文辉 《Journal of Beijing Institute of Technology》 EI CAS 2007年第3期352-357,共6页
Organomontmorillonites (organo-MMT) were synthesized by means of montmorillonites (MMT) modified with a series of 2-methacryloyloxy ethyl alkyl dimethyl ammonium bromide (MAAB) having different alkyl chain lengt... Organomontmorillonites (organo-MMT) were synthesized by means of montmorillonites (MMT) modified with a series of 2-methacryloyloxy ethyl alkyl dimethyl ammonium bromide (MAAB) having different alkyl chain lengths as cationic surfactants through a cationic exchanging reaction, and were characterized by FTIR, TG, elemental analysis, and XRD. The microenvironment of the organic interlayer such as the orientation and arrangement of the alkyl chains of MAAB, as well as the properties of nanocomposite hydrogels, were also investigated. The amount of organic components absorbed on interlayer and the basal spacing of organo-MMT both increase with the increasing of alkyl length of MAAB. When carbon number of alkyl chain is in the region of 8 to 14, the alkyl chains between layers would adopt a disordered gauche conformation; while the carbon number is 16, an ordered all-trans conformation with a vertical orientation would be found together with the disordered gauche conformation according to the results of XRD and FTIR. Due to the difference of microenvironment of organic interlayer, the Young's moduli of the nanocomposite hydrogels increased as the alkyl chains of MAAB became longer. 展开更多
关键词 montmorillonite 2-methacryloyloxy ethyl alkyl dimethyl ammonium bromide organomontmo-rillonite microenvironment of interlayer
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Alkyl Radical Initiated Cyclization/Cascade for Synthesizing Lactam-Substituted Alkyl Sulfones
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作者 Li-Jun Wu Kai-Yi Zhang +5 位作者 Pei Yang Chuan-Chong Peng Jin-Hui Liu Qing Li Da-Zhi Sun Shuangfeng Yin 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2024年第16期1853-1859,共7页
An alkyl radical initiated cyclization/tandem reaction of alkyl bromides and alkyl electrophiles by using potassium metabisulphite(K_(2)S_(2)O_(5))as a connector is developed for the synthesis of various lactam-substi... An alkyl radical initiated cyclization/tandem reaction of alkyl bromides and alkyl electrophiles by using potassium metabisulphite(K_(2)S_(2)O_(5))as a connector is developed for the synthesis of various lactam-substituted alkyl sulfones.Notably,this process does not require a metal catalyst or metal powder reductant,highlighting its environmentally friendly features.The reaction demonstrates outstanding substrate adaptability and a high tolerance towards diverse functional groups.Furthermore,the biologically active molecules and commercially available drugs with a late-stage modification are also highly compatible with this transformation.Mechanistic studies revealed that the reaction proceeds through a single-step process involving intramolecular radical cyclization,"SO_(2)"insertion,and external alkyl incorporation. 展开更多
关键词 alkyl radical Metal-free catalyzed Cyclization/cascade Potassium metabisulphite Electrophiles alkyl sulfones LACTAMS alkyl bromides Sodium formate
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Study on the sulfinatodehalogenation of BrCF_2CF_2R
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作者 HU, Qiao-Sheng HU, Chang-Ming HUANG, Wei-YuanShanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China 《Chinese Journal of Chemistry》 SCIE CAS CSCD 1997年第5期472-474,共3页
Sodium dithionite initiated sulfinatodehalogenation of BrCF2CF2R is studied.
关键词 SULFINATODEHALOGENATION fluorinated alkyl bromide fluorinated sulfinates fluorinated sultene
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