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排序方式: 共有165条查询结果,搜索用时 281 毫秒
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Stefano Colonna Vincenza PirontiPiero Pasta Francesca Zambianchi 《Tetrahedron letters》2003,44(4):869-871
Cyclohexanone monooxygenase catalyzed the oxidation of tertiary, secondary and hydroxylamines to N-oxides, hydroxylamines and nitrones respectively. 相似文献
34.
M. A. Aramendía V. Borau C. Jiménez J. M. Marinas F. J. Romero 《Reaction Kinetics and Catalysis Letters》1996,58(1):183-191
This paper reports on the synthesis and characterization of various mixed orthophosphates [NaMgPO4, Na4Mg(PO4)2 and NaMg4(PO4)3] obtained from freshly prepared Mg3(PO4)2 gel by using various treatments. The solids exhibit excellent selectivity in the gas-phase conversion of cyclohexanol (CHOL) to cyclohexanone (CHONE). 相似文献
35.
LI Hua-Ming YE Xing-Kai YANG Xiang-Guang WU Yue Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin S China 《中国化学》1997,15(6):512-527
The catalytic oxidation of cyclohexene to cyclohexanone using Pd(OAc)2/HQ/FePc was investigated in an acidic aqueous solution of acetonitrile. The role of each component of this system in the oxidation of cyclohexene was explored by means of UV-VIS, IR, XPS spectroscopy and cyclic voltammetry, respectively. Based on the experimental results, the mechanism of the oxidation of cyelohexene catalyzed by Pd(OAc)2/HQ/FePc was elucidated. 相似文献
36.
Updated Abraham solvation parameter model correlations are derived for describing the partitioning and solubility behaviour of organic nonelectrolyte solutes and inorganic gases in both anhydrous butanone and cyclohexanone solvents. The butanone and cyclohexanone correlations are based on data sets that contain 103 and 72 experimental data points, respectively. The derived correlations for butanone describe the experimental partitioning and solubility behaviour to within a standard deviation of 0.145 log units. A slightly smaller standard deviation of 0.135 was observed between the experimental and back-calculated values for the cyclohexanone solvent correlation equations. 相似文献
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Dr. Elvira Romero Dr. J. Rubén Gómez Castellanos Prof. Dr. Andrea Mattevi Prof. Dr. Marco W. Fraaije 《Angewandte Chemie (International ed. in English)》2016,55(51):15852-15855
Cyclohexanone monooxygenase (CHMO) is a promising biocatalyst for industrial reactions owing to its broad substrate spectrum and excellent regio‐, chemo‐, and enantioselectivity. However, the low stability of many Baeyer–Villiger monooxygenases is an obstacle for their exploitation in industry. Characterization and crystal structure determination of a robust CHMO from Thermocrispum municipale is reported. The enzyme efficiently converts a variety of aliphatic, aromatic, and cyclic ketones, as well as prochiral sulfides. A compact substrate‐binding cavity explains its preference for small rather than bulky substrates. Small‐scale conversions with either purified enzyme or whole cells demonstrated the remarkable properties of this newly discovered CHMO. The exceptional solvent tolerance and thermostability make the enzyme very attractive for biotechnology. 相似文献
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在氧气和波长大于320nm的紫外光作用下,TiO2能够催化氧化环己烷,生成环己酮和环己醇中间产物.在水悬浮液中加入少量氟化钠,能够显著提高锐钛矿型TiO2的光催化活性.随着氟离子浓度的增加,环己酮和环己醇的生成量,以及环己醇对环己酮的物质的量比均随之增加尔后达到饱和,且几乎与溶液的起始pH值(3.0和5.5)无关.随着TiO2煅烧温度的上升,环己酮和环己醇的生成量是先增加后下降;氟离子存在时也呈现类似的变化趋势,但环己酮和环己醇生成量的增加幅度与氟离子在TiO2表面的吸附量高低不尽一致.此外,金红石型二氧化钛的光催化活性较差,且加入氟离子反而抑制环己酮和环己醇的产生.对这些影响因素进行了讨论.再次假设,在二氧化钛双电层内形成的氟氢键能够促进表面羟基自由基脱附,从而加快环己烷的氧化,提高环己酮和环己醇的产率. 相似文献