共查询到18条相似文献,搜索用时 62 毫秒
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从3,16-二羟基-1-硫杂-5,3,11,14-四氧杂环十七烷(二羟基硫杂-17冠-5)出发,通过醚化反应,合成了双(己氧基),双(十二烷氧基)、双(十六烷氧基),双(苄氧基)和双(烯丙氧基)硫杂-17-冠-5。单己氧基、单十二烷氧基,单十六烷氧基和单苄氧基硫杂-17-冠-5作为副产物分离得到。通过二羟基硫杂-17-冠-5与丁二酰氯缩聚,合成了主链含硫杂冠醚的聚酯。 相似文献
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简要介绍了冠醚化学的产生、发展及应用;重点介绍了:(1)新型冠醚化合物的合成及应用;(2)新型冠醚超分子聚合物的合成及自组装;(3)新型金属冠醚的合成及应用,并对冠醚化学的发展进行了展望。 相似文献
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氮杂冠醚合成中的双功能基试剂 总被引:1,自引:0,他引:1
综述了氮杂冠醚合成中的双功能基试剂的进展。着重讨论了典型的双功能基试剂,如取代多甘醇、二胺、氨基二醇、二卤代物、二醛和二酮以及3-烷氧丙烯醛等的制备方法。 相似文献
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磷杂螺环化合物的合成及表征 总被引:4,自引:0,他引:4
合成了双(4 甲撑 2,6,7 三氧杂 1 磷杂双环[2,2,2]辛烷)磷酸三聚氰胺盐(Ⅲ)及2,6,7 三氧杂 1 磷杂双环[2,2,2]辛烷甲醇(Ⅰ)、双(4 甲撑 2,6,7 三氧杂 1 磷杂双环[2,2,2]辛烷)氯代磷酸酯(Ⅱ),三者的得率分别为727%、900%及573%;同时对化合物(Ⅰ)、(Ⅱ)及(Ⅲ)的核磁共振碳谱和红外光谱谱图进行了归属和解析,并得到元素分析的证实 相似文献
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聚甲氧基二甲醚(PODEn)是一种环保、友好、高效的柴油添加剂,具有非常广阔的应用前景。以甲醇与甲醛为原料,氯化锌为催化剂合成了PODEn,探讨了其合成机理,考察了反应温度、时间、催化剂用量和原料配比等条件对反应的影响,并将氯化锌、强酸性大孔树脂和氯化锌改性树脂进行比较。实验结果表明,氯化锌对甲醇和甲醛反应合成PODEn具有一定的催化活性,其较优的反应条件为:甲醇与甲醛质量比2:(3~4)、催化剂用量3.0%(质量分数)、反应温度105℃,反应时间300 min;氯化锌改性树脂具有更高的催化活性,产物含量较氯化锌提高10个百分点以上,同时降低了反应温度。 相似文献
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二缩水甘油醚的一步合成 总被引:4,自引:0,他引:4
用相转移催化剂合成乙二醇二缩水甘油醚和丁二醇二缩水甘油醚将合成路线简化为一步,产率分别为33.4%和40.7%。气相色谱、色质联用红外光谱鉴定了产物的组成及结构。 相似文献
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Two new crosslinked-crown ethers (CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6) were synthesized by the reaction of crosslinked chitosan (CCTS-NH2) with 4`-formyl benzo-15-crown-5 and 4`-formyl benzo-18-crown-6. Their structures were confirmed with elemental analysis, infrared spectra analysis, solid-state 13C NMR analysis, X-ray diffraction analysis, and differential scanning calorimetry thermogram analysis. In the infrared spectra of CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6, the characteristic peak of C=N stretch vibration appeared at 1650 cm−1. The X-ray diffraction analysis showed that the peak at 2θ = 20° decreased greatly in CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6. In the 13C NMR spectra of CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6, the characteristic peak of aromatic carbon appeared at 128-ppm, the characteristic peak of carbon in the C=N group appeared at 151 ppm. The adsorption and selectivity properties of CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6 for Ag+, Pd2+, Pb2+, Cd2+, and Cr3+ were studied. The experimental results showed that the two crosslinked chitosan-crown ethers have not only good adsorption capacities for Ag+ and Pd2+, but also high selectivity for the adsorption of Ag+ or Pd2+ with the coexistence of Pb2+ and Cr3+. The selectivity coefficients of CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6 were respectively. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 501–506, 1998 相似文献
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Two novel chitosan derivatives—crosslinked chitosan dibenzo‐16‐c‐5 acetate crown ether (CCTS‐1) and crosslinked chitosan 3,5‐di‐tert‐butyl dibenzo‐14‐c‐4 diacetate crown ether (CCTS‐2)—were synthesized by the reaction of crosslinked chitosan with dibenzo‐16‐c‐5 chloracetate crown ether and 3,5‐di‐tert‐butyl dibenzo‐14‐c‐4 dichloracetate crown ether with the intent of forming polymers that could be used in hazardous waste remediation as toxic metal‐binding agents in aqueous environments. Their structures were confirmed with elemental analysis, infrared spectral analysis, and X‐ray diffraction analysis. In the infrared spectra of CCTS‐1 and CCTS‐2, the characteristic peaks of aromatic backbone vibration appeared at 1595 cm−1 and 1500 cm−1; the intensity of the N H and O H stretching vibration in the region of 3150–3200 cm−1 decreased greatly. The X‐ray diffraction analysis showed that the peak at 2θ = 20° decreased greatly in CCTS‐1 and CCTS‐2. The adsorption and selectivity properties of CCTS‐1 and CCTS‐2 for Pb2+, Cu2+, Cr3+, and Ni2+ were studied. Experimental results showed that the two crosslinked chitosan derivatives had not only good adsorption capacities for Pb2+, Cu2+, but also high selectivity for Pb2+, Cu2+ in the coexistence of Ni2+. For aqueous systems containing Pb2+, Ni2+, or Cu2+, Ni2+, CCTS‐1 only adsorbed Pb2+ or Cu2+. For aqueous systems containing Pb2+, Cr2+ and Ni2+, CCTS‐2 had high adsorption and selectivity properties for Pb2+. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 2069–2074, 1999 相似文献
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介绍了冠醚化学的产生、发展及应用,详细介绍了:几种新型臂式冠醚及其超分子金属配合物的合成;取代冠醚及其金属配合物的合成及应用;新型氮杂冠醚及其金属配合物的合成及应用。并对冠醚化学的发展进行了展望。 相似文献
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通过X射线衍射(XRD)、扫描电子显微镜(SEM)、氨气程序升温脱附(NH3-TPD)和吡啶吸附-红外光谱(Py-IR)等对不同硅铝比(SiO2/Al2O3)的ZSM-5分子筛粉末催化剂进行表征。在间歇反应器中,本文对比了不同硅铝比ZSM-5分子筛粉末催化三聚甲醛和甲缩醛合成聚甲氧基二甲醚(PODE)的催化活性,结果表明硅铝比为400的ZSM-5分子筛粉末具有最高的PODE2~8的收率和选择性。然后,采用挤条成型法,在ZSM-5分子筛粉末(SiO2/Al2O3=400)中加入硅溶胶黏结剂和甲基纤维素黏结剂,制备得到ZSM-5成型催化剂,硅溶胶添加量和甲基纤维素分子量影响成型催化剂强度。采用ZSM-5成型催化剂,以固定床为反应器,反应温度和反应空速在所考察的范围内对三聚甲醛(TOX)的转化率和PODE的选择性影响较小。在85℃、压力1MPa、空速为5h-1的条件下进行了240h催化性能考察,成型催化剂催化性能稳定,三聚甲醛的转化率高于90%,PODE2~8的选择性达到95%以上。 相似文献