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合成环己亚胺可采用很多原料,如己二胺、己二醇、己内酰胺、烷基己内酰亚胺、己内酯、丙烯醛和氧杂环庚烷等。但从原料易得和供给稳定看,只有己二胺和己内酰胺比较合理。早期生产环己亚胺的方法都是生产己二胺时的副产品,但产量受到尼龙生产规模的限制。从40年代开始,德、美、日等发达国家的专利中相继报道了己二胺在催化剂作用下经脱氨环化可制得环己亚胺,但由于未能彻底解决分子间脱氨的技术难题,目前此路线己基本淘汰。利用己内酰胺催化加氢制取环己亚胺是80年代后发展起来的一种新方法,该法在国内外都己工业化生产,技术关键是选择合适的催化剂。利用丙烯醛也可合成环己亚胺,但该法只是小试报道,未见工业化生产。 相似文献
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生物除草剂9018的研究 总被引:6,自引:0,他引:6
在筛选新农用抗生素过程中,发现一株编号为9018的放线链霉菌,其4个活性组分(A、B、C、D)具有极强的杀草活性。经分离鉴定,确定A、B、C为环己酰亚胺类化合物,D为非环己酰亚胺类的新化合物。本文阐述了9018的发酵、分离、除草活性及安全性方面的研究。 相似文献
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利用四齿胺亚胺配体(1R,2R)-[(NHAr)C6H4CH==N]2C6H10(Ⅱ:Ar=苯基,Ⅲ:Ar=2,6-二甲基苯基)与三甲基铝反应得到了双核胺亚胺铝配合物(Ⅳ、Ⅴ)。利用1HNMR、13CNMR和X射线单晶衍射仪对配合物Ⅳ、Ⅴ结构进行了表征。通过Ⅳ、Ⅴ在苄醇(Bn OH)的存在下催化ε-己内酯开环聚合制备聚己内酯,并对反应条件进行了优化。结果表明,配合物Ⅳ、Ⅴ具有单配体双金属中心结构,当n(ε-己内酯)∶n(BnOH)∶n(Ⅳ或Ⅴ)=200∶4∶1时,在1.5 min内ε-己内酯转化率>97%,Ⅳ和Ⅴ的转化频率分别为7840、9700 h–1,远高于乙基桥联双核胺亚胺铝配合物(1152 h–1)和单核胺亚胺铝配合物(2550 h–1);得到的聚合物相对分子质量可控,聚合反应具有活性聚合的特点。 相似文献
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建立了一种用于重排反应工艺监控和测定红霉素6,9亚胺醚及其相关化合物含量的反相高效液相色谱法,色谱柱为150mm×4 6mm,填料InertsilODS-3,粒径5μm,流动相为V(CH3CN)∶V〔c(KH2PO4)=0 033mol/L缓冲溶液〕=30∶70,流速0 8mL/min,柱温30℃;紫外检测波长205nm。该方法能够在12min内快速准确指认重排产物中化学性质差异较大的6种物质:红霉素A6,9亚胺醚、红霉素A9,11亚胺醚、红霉素A9位内酰胺、红霉素A8位内酰胺、红霉素E肟和Z肟,并且贝克曼重排产物在进样量13~100μg显示良好的线性关系(rA=0 9975;rB=0 9994;rC=0 9930)。 相似文献
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新型环己亚胺类离子液体的合成及其催化酯化反应性能 总被引:1,自引:0,他引:1
利用环己亚胺与1,3-丙烷磺酸内酯生成的1-(3-磺丙基)环己亚胺盐,合成了2种新型Br?nsted酸性离子液体1-(3-丙磺基) 环己亚胺硫酸氢盐([HMIPS]HSO4)和1-(3-丙磺基) 环己亚胺对甲苯磺酸盐([HMIPS]OTs)。采用1H NMR、FT-IR、LC-ESI-MS及DSC-TG等方法对其进行了表征。结果表明,所合成的[HMIPS]HSO4和[HMIPS]OTs是一类新型的Br?nsted酸性离子液体。该类型离子液体含有环己亚胺7元环,分解温度高于260℃,其水溶液的pH值与相同浓度的硫酸水溶液的相近,具有较强的Br?nsted酸性。最后考察了所合成的新型离子液体对柠檬酸和正丁醇酯化反应的催化性能,并与传统咪唑类离子液体进行了对比。结果显示,所合成的新型离子液体具有良好的催化活性,[HMIPS]HSO4为催化剂时,在n(柠檬酸):n(正丁醇):n([HMIPS]HSO4)=5:1:0.02,110-130℃和回流反应2 h的条件下,柠檬酸的转化率为98.3%,柠檬酸三丁酯的收率可达97.5%。而传统的咪唑离子液体[MIMPS]HSO4为催化剂时,柠檬酸的转化率和柠檬酸三丁酯的收率分别为95.8%和94.7%。[HMIPS]HSO4催化剂在重复使用10次后催化活性未见明显下降。 相似文献
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在无水碳酸钾存在下,N,N-二甲基甲酰胺为溶剂,由2-氯乙酰甲胺和4-苯氧基苯酚反应,制备了N-甲基-2-(4-苯氧基苯氧基)乙酰胺。而后,以乙腈和四氯化碳为混合溶剂,磺酰氯和N-甲基-2-(4-苯氧基苯氧基)乙酰胺反应,得到目的产物。着重考察了反应温度、反应时间、物料摩尔比对目的产物收率的影响。从而确定了产物的合成工艺条件为:反应温度40℃,反应时间5 h,n[N-甲基-2-(4-苯氧基苯氧基)乙酰胺]∶n(磺酰氯)=1∶1.4;在此条件下,产物的收率达80%以上。经IR、MS1、H NMR确定为N-甲基-2-[4-(4-氯苯氧基)苯氧基]乙酰胺。 相似文献
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A novel method for crosslinking polyetheretherketone via imine formation at carbonyl groups is presented. In polyetheretherketone these Schiff bases form short, stiff crosslink junctions which are stable up to 630°C. Dynamic mechanical and thermal properties of polyetheretherketone and imine crosslinked polyetheretherketone are reviewed. A large reduction in the temperature sensitivity of the material stiffness has been achieved. Increases in the glass transition temperature from 143°C to greater than 280°C have been obtained. 相似文献
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以甲苯作带水剂,三氮唑和氢氧化钾水溶液反应制备三氮唑钾盐;以氯乙酸甲酯和甲胺为原料制备2-氯乙酰甲胺。再以乙腈为溶剂,使三氮唑钾盐和2-氯乙酰甲胺反应制备目的产物2-(1H-1,2,4-三唑-1-基)乙酰胺。着重考察了三氮唑钾盐和2-氯乙酰甲胺反应的反应温度、反应时间及其摩尔比对目的产物收率的影响。从而确定了2-(1H-1,2,4-三唑-1-基)乙酰胺的合成工艺条件为:在乙腈中回流反应,反应时间4 h,n(三氮唑钾盐)∶n(2-氯乙酰甲胺)=1.3∶1;在此条件下,2-(1H-1,2,4-三唑-1-基)乙酰胺的收率达87.5%。并用1H NMR,MS,IR,元素分析对其结构进行了表征。 相似文献
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二氯乙酸甲酯与甲胺反应,制备了中间体N-甲基二氯乙酰胺。在无水碳酸钾存在下,以N,N-二甲基甲酰胺(DMF)为溶剂,中间体与4-苯氧基苯酚反应得到目的产物。着重考察了反应温度、反应时间、物料投料比对目的产物收率的影响,从而确定了产物的合成工艺条件为:反应温度85°C,反应时间4h,物料投料比n(N-甲基二氯乙酰胺)∶n(4-苯氧基苯酚)=1.0∶2.2。在此条件下,产物的收率达82%以上。经IR、MS、1H NMR确定为N-甲基-2,2-二(4-苯氧基苯氧基)乙酰胺。 相似文献
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Jakrapan Janlamool Supaporn Khaubunsongserm Bunjerd Jongsomjit 《Iranian Polymer Journal》2017,26(10):775-784
The following study focuses on the reduction of the required amounts of MAO after the addition of Ti into the prepared spherical silica particle (SSP) to obtain TiSSP as a support of the bis(phenoxy–imine) Ti-based catalyst used for ethylene polymerization. The ethylene polymerization was carried out via the introduction of SSP and TiSSP-supported MAO with various MAO contents, followed by adding the bis(phenoxy–imine) Ti-based catalyst. The characteristics of SSP and Ti-modified SSP were determined by XRD, BET, FTIR, and NH3-TPD. There was evidence of the presence of Ti–O–Si bond and the increase of acidity with the introduction of Ti into SSP. Interestingly, the increased acidity on the surface of TiSSP composites was found to be the crucial characteristic, which played an important role on the reduction of the required amounts of MAO. It is suggested that the modification of SSP with Ti is able to decrease (by ca. 22%) the consumption of the required amounts of MAO for polymerization. In other words, the lower ratio of MAO to catalyst for TiSSP was observed for the identical value of activity obtained from SSP. The produced polymers were thoroughly identified by DSC and SEM techniques. All polyethylenes obtained using TiSSP exhibited higher crystallinity than those obtained from SSP support. Finally, employing the TiSSP-supported bis(phenoxy–imine), Ti-based catalyst leads to producing the polymer with lamellar structure that seemed to be corresponding to the crystalline structure as was confirmed by DSC results. 相似文献
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Dongmei Hao Lingwan Hao Changliang Deng Wanzhong Ren Congcong Guo Hongying Lü 《化学工程与技术》2019,42(6):1276-1282
A series of acetamide‐based deep eutectic solvents (DESs) with different proportions were prepared. Extraction and catalytic oxidation desulfurization (ECODS) of the acetamide‐based DESs were investigated and the process was optimized. Such DESs with a molar ratio of acetamide and p‐TsOH of 1/3 (C2H5NO/3p‐TsOH) exhibits such a remarkable catalytic activity that the dibenzothiophene (DBT) removal could reach 100 % under optimized conditions. C2H5NO/3p‐TsOH was used for the oxidative desulfurization of actual commercial diesel. The sulfur removal of diesel achieved up to 98 %. C2H5NO/3p‐TsOH could be recycled six times and the desulfurization activity was slightly decreased. Evaluation of the mechanism indicated that oxidative desulfurization (ODS) was realized via dual activation of acetamide‐based DESs. A novel and effective way for deep desulfurization of diesel is provided. 相似文献