共查询到20条相似文献,搜索用时 250 毫秒
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非水介质中的酶催化反应 总被引:6,自引:0,他引:6
介绍了非水溶剂体系中的酶催化反应,主要是反胶束体系中酶催化反应和脂肪酶催化反应的新研究成果,评述了各溶剂体系中酶的结构,动力学特征,稳定性及活性。 相似文献
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生物催化剂酶在高分子改性中的应用 总被引:2,自引:0,他引:2
生物催化剂酶用于高分子合成及改性的研究正在成为国外学者的一个新的研究热点,酶催化反应的专一性,高效性,高选择性及反应条件的相对温和性,使酶催化反应在高分子改性领域更具吸引力,为高分子改性开辟了一条更为清洁,更高效的途径。本文综述了近年来酶催化反应在高分子改性方面的研究进展。 相似文献
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血红蛋白过氧化物模拟酶胶束催化显色体系 总被引:6,自引:0,他引:6
在胶束Tween80介质中,研究了以血红蛋白(hemoglobin,Hb)作为过氧化物模拟酶、隐性亮绿(recessive brilliant green,RGB)为氢供体底物、溶解氧为受氢体的酶催化反应特性。在pH5.64(NH4)2HPO4-KH2PO4缓冲溶液中,利用模拟酶对溶解氧作为受氢体催化RBG氧化生成亮绿(brilliant green,BG)而拟定了测定Hb含量的新方法。讨论了胶束介质对酶体系催化反应的影响及酶催化反应的可能机理。 相似文献
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OPD-H2O2-HRP伏安酶联免疫分析体系酶催化反应的研究 总被引:21,自引:1,他引:21
应用电化学分析、高效液相色谱、紫外-可见光谱、红外光谱和核磁共振等技术对邻苯二胺(OPD)-H2O2-辣根过氧化物酶(HRP)伏安酶联免疫分析体系的酶催化反应进行了详细深入的研究.用化学方法制得了HRP酶催化H2O2氧化OPD的产物纯品.伏安法和高效液相色谱实验说明,在所选择的酶催化反应条件下,酶催化反应只生成一种产物;经紫外-可见光谱,红外光谱和13C核磁共振谱鉴定,产物为2,3-二氨基吩嗪.写出了酶催化反应过程,同时对酶催化反应产物的电极还原过程也进行了研究. 相似文献
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在有机溶剂中进行的酶催化反应 总被引:8,自引:0,他引:8
介绍了在有机溶剂中进行酶催化反应的进展,包括在有机溶剂中进行酶催化反应的某些性质、特点及必须遵循的原则,并举例说明了在有机合成中应用的可能性,指出了该领域中尚待深入研究的问题。 相似文献
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Micro-flow photochemical reactions have great advantage over batch photochemical reactions due to its high light-penetration efficiency. Integrated micro-flow reaction enables efficient synthesis of structurally complex compounds from simple starting materials and it can avoid handling of explosive, toxic, unstable, or odorous intermediates. Combination of micro-flow photochemical reactions with integrated micro-flow synthesis enhances their benefits. Here we summarize recently reported integrated multi-step micro-flow synthesis containing various photochemical reactions. 相似文献
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碘催化的有机反应具有价廉易得、操作简单、温和、清洁、高效及高选择性等优点, 广泛应用于亲电反应、亲核反应、多组份反应以及其它涉及复杂官能团化合物的合成反应中, 在环境友好化学合成、复杂化合物合成及选择性合成领域具有应用价值. 相似文献
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Koichiro Masuda Tomohiro Ichitsuka Nagatoshi Koumura Kazuhiko Sato Shū Kobayashi 《Tetrahedron》2018,74(15):1705-1730
In the past few decades, organic reactions under flow conditions have attracted increasing attention. Flow reactions have a number of advantages over batch reactions in terms of environmental compatibility, efficiency, and safety. In particular, flow reactions with heterogeneous catalysts that yield desired products without significant levels of by-product formation can enable purification processes to be avoided. This feature can allow flow reactions to be assembled in a multi-step and continuous manner for the synthesis of complex molecules. These new techniques have opened up new approaches to the synthesis of fine chemicals and are expected to play a prominent role in future chemical manufacturing processes. In this context, this review aims to summarize recent developments in continuous-flow reactions with heterogeneous catalysts for synthesis of fine chemicals. 相似文献
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In marked contrast to Michael reactions, oxa-Michael reactions have not been used as standard transformations in organic synthesis until quite recently. This was mainly due to a lack of reactivity and selectivity, although the potential products of such reactions are valuable intermediates. This tutorial review presents recent major advances in the field of oxa-Michael (sometimes called oxo-Michael or oxy-Michael) reactions and applications in the total synthesis of complex natural products. 相似文献
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过渡金属化学已发展成为有机合成的重要方法,本文综述了它在精细有机合成中应用的一些进展。叙述了金属有机化合物作为亲电体与亲核试剂反应,金属有机化合物作为亲核体与亲电试剂反应,以及偶合和环化反应。应用这些反应可以巧妙地合成若干天然产物。 相似文献
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ZhaoguangNie HongweiLiu DianhuaLiu WeiyongYing DingyeFang 《天然气化学杂志》2005,14(1):22-28
The intrinsic kinetics of dimethyl ether (DME) synthesis from syngas over a methanol synthesis catalyst mixed with methanol dehydration catalyst has been investigated in a tubular integral reactor at 3-7MPa and 220-260℃. The three reactions including methanol synthesis from CO and H2, CO2 and H2, and methanol dehydration were chosen as the independent reactions. The L-H kinetic model was presented for dimethyl ether synthesis and the parameters of the model were obtained by using simplex method combined with genetic algorithm. The model is reliable according to statistical analysis and residual error analysis. The synergy effect of the reactions over the bifunctional catalyst was compared with the effect for methanol synthesis catalyst under the same conditions based on the model. The effects of syngas containing N2 on the reactions were also simulated. 相似文献
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Sanju Francis D. Mitra B.R. Dhanawade Lalit Varshney Sunil Sabharwal 《Radiation Physics and Chemistry》2009,78(11):951-953
In this report a simple route for gamma radiation induced synthesis of superporous hydrogel (SPH) is described. Conventional SPH synthesis requires foaming and cross-linking reactions to take place simultaneously. However, in radiation synthesis it is difficult to introduce foaming during the cross-linking reactions. In order to overcome this limitation, the foaming and radiation cross-linking reactions were decoupled and carried out in two stages. The polyacrylamide SPH synthesized by this approach has very fast swelling kinetics compared to the non-porous hydrogel. 相似文献
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William D. Wulff Peng-Cho Tang Kin-Shing Chan J. Stuart McCallum Dominic C. Yang Scott R. Gilbertson 《Tetrahedron》1985,41(24):5813-5832
The synthetic aspects of several reactions from the multifaceted chemistry of Fischer carbene complexes are examined. Their benzannulation reactions with acetylenes are utilized in the synthesis of anthracyclinones via two approaches which differ by beginning at opposite ends of the molecule with either an aryl or an alkenyl substituted chromium carbene complex. The latter has been employed in a formal synthesis of daunomycinone. The Diels-Alder reactions of ,β-acetylenic chromium carbene complexes provide for a facile entry into substituted cyclohexenyl chromium carbene complexes that are subsequently employed in benzannulation reactions. These tandem cycloaddition/annulation reactions are incorporated into model studies for the synthesis of anthracyclinones and wentilactone A. Their potential is also demonstrated for coupling to yet a third reaction of organochromium compounds ; aromatic nucleophilic substitutions on arene chromium tricarbonyl complexes. The annulations of β,β-disubstituted alkenyl complexes provides for a regio- and stereoselective synthesis of 2,4-cyclohexadienones under neutral conditions at near ambient temperatures. 相似文献
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A paradigm shift away from using solvents in organic synthesis as solventless reactions can lead to improved outcomes, and more benign synthetic procedures, in for example aldol condensation reactions, sequential aldol and Michael addition reactions en route to Kr?hnke type pyridines, reactions leading to 3-carboxycoumarins, benzylidenes, 4-aryl-1,4-dihydropyridines and 2-aryl-1,2,3,4-tetrahydroquinazolines, and oligomerisation reactions for the synthesis of cavitands; kinetic considerations for the reaction of two solids can only be explained if a eutectic melt is formed during the reaction. 相似文献