共查询到19条相似文献,搜索用时 156 毫秒
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二甲基硅烯与含烯丙基甲醚结构的化合物1-5的反应具有良好的化学和区域选择性。产物是双键经过重排的取代烯丙基二甲基甲氧基硅烷6-10, 该产物可进行一系列亲电取代反应。 相似文献
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由邻苯二甲酸酐为原料,经中间体3-羟基苯酞(3),再经溴丙烯及锡存在下3的烯丙基化、硼氢化氧化、铬酐氧化,二甲基锌甲基化,共6步反应合成了3-(3‘-羟基丁基)异苯并呋喃-1(3H)-酮。 相似文献
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次氯酸可与二甲基取代的烯烃在二氯甲烷-水两相体系中反应生成烯丙基氯化物。这样的烯丙基氯化物既可进行官能团转化,又可进行碳—碳键形成反应。由次氯酸进行的烯氯化反应已用在某些天然物的合成中。 相似文献
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二甲基二烯丙基氯化铵的辐射聚合和性质研究 总被引:9,自引:0,他引:9
对二甲基二烯丙基氯化铵进行了辐射聚合,得到线型聚合物的交联的水凝胶, 实验测定了线型聚合的转化率与剂量和水凝胶的凝胶的凝胶分数、平衡溶胀与剂量 的关系。结果表明聚二甲基二烯丙基氯化铵水凝胶的凝胶含量与剂量的关系符合 Charlesby-Pinner公式,外推S + S~(1/2) = 2求得凝胶剂量D_g,从而求出G(x) 等值;并首次利用二甲基二烯丙基氯化铵及其聚合物稀水溶液的电导率与浓度的线 性关系,发展了一种对电解质的辐射聚合反应转化率的电导测定法。 相似文献
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《印度化学会志》2021,98(9):100129
The modification of chitosan in ionic liquids through homogeneous reactions has advantages including shorter time and simple post-treatment and the generated chitosan derivatives have high degrees of subsititution and good reproducibility. In this paper, we studied the reaction kinetics of glycidyl trimethyl ammonium chloride and chitosan in 1-allyl-3-methylimidazolium chloride. Chitosan concentration, temperature, and reaction time were studied to determine their influence on reaction kinetics. The results indicated that reaction rate increased with increases of both chitosan concentration and temperature. A first-order kinetics equation was generated, where the relationship between reaction rate constant and temperature was determined. 相似文献
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研究了反应温度、溶液浓度、固液比、固体粒径大小和搅拌速度对氯化铵溶液浸提粗硼砂(十水四硼酸钠,Na2B4O7·10H2O)动力学的影响。结果表明反应速率随反应温度、溶液浓度的增加和固体粒径、固液比的减小而增加,但搅拌速度对溶解速率无显著影响。根据均相和多相动反应力学模型研究了粗硼砂的溶解过程。结果表明溶解速率遵从假一级均相反应模型。粗硼砂在氯化铵溶液中溶解的活化能为82.73 kJ·mol-1。 相似文献
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壳聚糖季铵化衍生物的吸湿性与保湿性 总被引:25,自引:0,他引:25
壳聚糖季铵化衍生物的吸湿性与保湿性许晨,卢灿辉(福建师范大学高分子研究所福州350007)关键词壳聚糖季铵盐,壳聚糖衍生物,吸湿性,保湿性壳聚糖是从虾、蟹等废弃甲壳中提取得到的一种生物活性物质[1,2],由于其特有的直链聚阳离子结构,成膜附于角蛋白与... 相似文献
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Hee-Young Park Dong-Won Lee Hwa-Soo Lee Dong-Ok Lim Dae-Won Park 《Reaction Kinetics and Catalysis Letters》2003,79(2):245-255
Photopolymers with both pendant cyclic carbonate groups and cinnamic ester groups were synthesized by the addition reaction
of poly(glycidyl methacryalte-co-styrene)[poly(GMA-co-AN)] with carbon dioxide and then with cinnamoyl chloride. Soluble quaternary ammonium salt catalysts showed good yield of
cinnamoyl chloride addition to the glycidyl methacrylate groups. Quaternary salt catalysts of longer alkyl chain length and
of more nucleophilic anion offered higher yield of cinnamoyl chloride addition. Photochemical reaction test showed that poly(CNMA-co-DOMA-co-St) had a good photosensitivity.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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TG characterization of organically modified montmorillonite 总被引:1,自引:1,他引:1
V.L. P. Soares R. S. V. Nascimento V. J. Menezes L. Batista 《Journal of Thermal Analysis and Calorimetry》2004,75(2):671-676
Montmorillonite was modified with octadecyltrimethylammonium chloride, under different reaction conditions, as evidenced by
TG and XRD. TG curves presented two degradation peaks (295 and 395°C). At low salt concentrations, only the 395°C-degradation
appeared, which increased with reaction time to the limit of 9 g of salt/100 g of clay. The second peak presented a limit
at 17/100 m/m of salt/clay ratio. XRD analysis confirmed clay organic modification as the basal distance increased, showing greater reaction
time effect than the salt mass effect, and with only one d-spacing. This suggested that an intercalation complex was formed
but also that octadecyltrimethylammonium was adsorbed on the external surfaces of clay particles.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献