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以六亚甲基四胺和γ-氯丙基三甲氧基硅烷为原料,研究了一种多头基有机硅季铵盐的合成,用FTIR、NMR对目标产物进行了表征,对其合成工艺进行了优化,并使用微波技术加速了反应速率、提高反应产率,仅用8 h就使产率达到95.6%。另外,对其熔点、表面张力、临界胶束浓度和杀菌性能进行了考察。实验结果表明,该产物的每个分子上平均含有3个季铵盐基团,熔点为116.3~118.8℃,γCMC为46.30 mN/m,临界胶束浓度CMC为0.19 g/L,对大肠杆菌的抑菌环直径可达27.4 cm。 相似文献
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相转移催化剂可改善反应条件,提高收率,使反应慢、产率低的非均相反应正常进行。但是合成成本高,很难实现工业化生产。根据季铵盐类相转移催化剂的烷基化合成原理,设计并合成出未见文献报道的新型季铵盐类相转移催化剂三乙基丁基溴化铵(TEBAB),以降低成本,提高市场竞争力。该合成以三乙胺和溴代正丁烷为原料,DMF为反应溶剂进行反应,考查了配料比、反应温度、反应时间等条件对产物产率的影响,应用三因素三水平的正交实验法确定该合成的最佳工艺条件为:配料比为1.0∶1.5,反应温度102℃,反应时间1h。经过熔点测定和傅立叶变换红外光谱仪对其进行结构表征确认,产品的熔点为99.6℃~102.4℃,红外谱图分析确认所合成产品为目的物。最后,通过诺氟沙星衍生物合成的相转移催化反应实验验证了其催化活性。 相似文献
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报道了一种安全、绿色、高效合成N,N,N-三甲基-1-金刚烷基季铵碱的方法.首先,以1-金刚烷胺为原料,碳酸二甲酯(DMC)为甲基化试剂,合成中间体N,N,N-三甲基-1-金刚烷基季铵盐.然后,中间体与氢氧化钙反应,得到最终产物N,N,N-三甲基-1-金刚烷基季铵碱.通过1HNMR和13CNMR对季铵盐和季铵碱的结构进行了表征.分别考察了催化剂、反应物物质的量比〔n(1-金刚烷胺):n(DMC)〕、反应温度和时间对N,N,N-三甲基-1-金刚烷基季铵盐收率的影响.得到的最佳反应条件为:N,N-二甲基甲酰胺(DMF)作为催化剂,且m(DMF)/m(1-金刚烷胺)=0.25,n(1-金刚烷胺):n(DMC)=1:8,反应温度和时间分别为140℃和5 h.在该条件下,N,N,N-三甲基-1-金刚烷基季铵盐的收率可达97.3%. 相似文献
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以十二烷基二甲基叔胺和1,3-二氯丙烷为主要原料合成了一种Gemini季铵盐阳离子表面活性剂。通过红外光谱对其进行了定性分析,并测定了其熔点、临界胶束浓度(CMC)、发泡性、稳泡性以及防膨性能。结果表明,该Gemini季铵盐阳离子表面活性剂具有较高的表面活性,熔点为190℃,CMC为9.68×10-4mol.L-1,发泡与稳泡性能良好,防膨率达85.3%。 相似文献
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综述了以4-羟基联苯、4-羟基-4'-氰基联苯、4-羧基苯硼酸、4-羟基苯硼酸为原料制备4'-羟基联苯-4-甲酸的四种合成方法,对每种合成工艺的优缺点进行分析,并介绍了其在构筑有机发光材料、液晶材料及其中间体、法尼醇X受体拮抗剂等领域合成中的应用,展望了4'-羟基联苯-4-甲酸的应用前景. 相似文献
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Stephan Kirchmeyer Alexander Karbach Hanns-Peter Müller Helmut-Martin Meier Rolf Dhein 《大分子材料与工程》1991,185(1):33-42
The introduction of mesogenic groups in main- and sidechains of epoxy thermosets results in an ordered multiphase network with cellular structure, if gelation occurs below the maximal cure temperature Tmax. Tmax is individual for a given combination of monomers. The multiphase network consists of relatively soft anisotropic cell nuclei and hard isotropic cell walls. If gelation occurs above Tmax single phase networks are obtained. The size of the cell nuclei strongly depends on the used monomers and varies up to two orders of magnitude. The multiphase structure was found to have no impact on the tensile elastic modulus. 相似文献
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《Journal of Sulfur Chemistry》2013,34(6):665-673
ABSTRACTIn this study, the stability of the 4-halo-4-H-pyran and 4-halo-4-H-thiopyran molecules in planar and puckered conformations was investigated in the B3LYP/6-311++G(d,p) level of theory. The total energy, dipole moment, the energies of frontier orbitals, and HOMO–LUMO gaps of the molecules were calculated. Natural bond orbital (NBO) analysis was used to illustrate vinylogous anomeric effect on the puckering of ring. The responsible interactions of this effect were determined. The interaction energy, off-diagonal elements and dipole moment values of their NBO were calculated. In addition, total steric exchange energy values of theses interaction were evaluated. 相似文献
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4-(4-氯苯基)环己醇及4-(4-氯苯基)环己酮的合成研究 总被引:1,自引:0,他引:1
以氯苯、环己烯、乙酰氯为原料,通过Friedel-Crafts反应、Baeyer-Villiger反应、水解反应得到4-(4-氯苯基)环己醇。通过正交试验得到Friedel-Crafts反应和Baeyer-Villiger反应优化后的工艺条件。4-(4-氯苯基)环己醇总收率达12.9%,较文献收率提高了6%以上。所得醇经次氯酸钠氧化,得到4-(4-氯苯基)环己酮,氧化收率87%,产品的结构经1HNMR、GC-MS鉴定。 相似文献
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将焦宝石粉、活性炭粉和铝粉按质量比39:27.6:33.4配料作为基料,再分别加入占基料总质量0、3%、6%和9%的TiO2粉末(锐钛矿型),加入<10%的酚醛树脂为结合剂混匀后,压制成型,坯体试样干燥后,置于刚玉管式炉中,通入流动氩气,分别于1 300、1 400、1 500、1 600和1 700℃保温2 h制备了Al4SiC4-Al4O4C复合材料.利用热重分析、化学分析、XRD和SEM等测试技术,研究了TiO2加入量对材料物相组成和显微结构的影响.结果表明:试样中的Ti在烧成过程中有少量损失,残余的TiO2在1 300 ℃前全部反应转变为TiC,生成的TiC在1 300~1 700 ℃稳定存在;Tio2加入量对材料物相组成没有明显影响,但TiO2加入量超过3%时,Al4SiC4和Al4O4C的生成温度将由1 500℃提升至1 600℃;随着材料中Ti4+浓度增加,Ti4+更容易与Al4SiC4形成有限置换固溶体而导致晶格缺陷,促使Al4SiC4在1 700℃分解,形成更多的Al4O4C短纤维,同时使试样表面生成片状Al2O3层. 相似文献
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H.-J. Deutscher C. Seidel M. Krber H. Schubert 《Advanced Synthesis \u0026amp; Catalysis》1979,321(1):47-64
Synthesis and Mesomorphic Properties of Phenyl 4-[trans-4-n-alkyl-cyclohexanoyloxy]-benzoates and Cyclohexyl-4-benzoyloxybenzoates Synthesis and liquid-crystalline properties of terminal and lateral substituted phenyl 4-[trans-4-n-alkylcyclohexanoyl-oxy]-benzoates 1–13 , cyclohexyl 4-benzoyloxybenzoates 14–17 and phenyl 4-benzoyloxybenzoates 18–23 are described. The effects of alicyclic part and of lateral substituents are discussed. 相似文献
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《中国耐火材料》2012,(3)
The Al4SiC4-Al4O4C composites were synthesized using 1∶6.5∶2.6 of molar ratio of kaolinite grog powder, carbon black, and aluminum powder as basic formulation, fixing the additions of kaolinite grog powder and carbon black, varying aluminum powder addition to make its proportion from 2.6 to 3.9, 5.5, 7.0, 8.6, and 10.4, respectively, adding phenolic resin as binder and absolute alcohol as dispersant, mixing well, pressing, drying, and firing at 1 700 ℃ for 2 h in a corundum tubular furnace in flowing argon. The effect of Al addition on phase composition and microstructure of Al4SiC4-Al4O4C composites was investigated by DTA-TG, XRD, and SEM. The results show that:(1) in a certain degree, more Al4SiC4 forms with Al powder addition increasing; (2) the formed Al4SiC4 has two morphologies, namely, sheet and block, and their particle sizes are 5-15 μm and 10-20 μm, respectively; (3) the Al powder addition increase has little effect on the grain shape and size of Al4SiC4; (4) the formed Al4O4C mainly distributes on the surface of the Al4SiC4 grains with irregular shape and particle size below 1 μm, and some of them bond together. 相似文献