Environmentally benign and effective syntheses of N-substituted carbamates via alcoholysis of disubstituted ureas over TiO2/SiO2 catalyst
文献类型：期刊论文
| 作者 | Wang LG(王利国)1,2; Shang JP(尚建鹏)1,2 ; Liu SM(刘士民)1,2; Liu LQ(刘乐全)1; Zhang SG(张世国)1; Deng YQ(邓友全)1
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| 刊名 | Pure and Applied Chemistry
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| 出版日期 | 2012 |
| 卷号 | 84期号:3页码:461-471 |
| 关键词 | alcoholysis disubstituted ureas N-substituted carbamates TiO2/SiO2 phosgene-free |
| ISSN号 | 0033-4545 |
| 通讯作者 | 邓友全 |
| 英文摘要 | Catalytic syntheses of cyclohexyl carbamates via alcoholysis of dicyclohexyl urea (DCU), which can be synthesized from CO2 and amines, were first investigated with low-molecular-weight alcohols, i.e., methanol, ethanol, butan-1-ol. TiO2/SiO2 catalyst was prepared by wet impregnation method using tetrabutyl titanate as titanium source. The catalyst was characterized by inductively coupled plasma/atomic emission spectroscopy (ICP/AES), N2 adsorption, X-ray diffraction (XRD), field emission/scanning electron microscopy (FE/SEM), transmission electron microscopy TEM), and NH3/temperature-programmed desorption (TPD) in detail. TiO2/SiO2 with 5 wt % loadings and calcination at 600 °C exhibited better catalytic activity, and excellent yields of >95 % with 98 % selectivities for desired carbamates were achieved. Accordingly, the strong acidity was considered to be responsible for its superior activity. Moreover, the catalytic activity can essentially be preserved during the recycling tests. The scope was also expanded to synthesize other alkyl or aryl carbamates via alcoholysis of the corresponding disubstituted ureas, and 94 % yields with 96 % selectivities can be achieved. It provided a good candidate for the organic carbamates syntheses via a phosgene/halogen-free and effective route. |
| 学科主题 | 物理化学与绿色催化 |
| 收录类别 | SCI |
| 资助信息 | Partial financial support from Bayer MaterialScience |
| 语种 | 英语 |
| WOS记录号 | WOS:000301282100005 |
| 公开日期 | 2013-08-28 |
| 源URL | [http://210.77.64.217/handle/362003/3702]  |
| 专题 | 兰州化学物理研究所_绿色化学研究发展中心 |
| 作者单位 | 1.Chinese Acad Sci, Lanzhou Inst Chem Phys, Ctr Green Chem & Catalysis, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang LG,Shang JP,Liu SM,et al. Environmentally benign and effective syntheses of N-substituted carbamates via alcoholysis of disubstituted ureas over TiO2/SiO2 catalyst[J]. Pure and Applied Chemistry,2012,84(3):461-471. |
| APA | Wang LG,Shang JP,Liu SM,Liu LQ,Zhang SG,&Deng YQ.(2012).Environmentally benign and effective syntheses of N-substituted carbamates via alcoholysis of disubstituted ureas over TiO2/SiO2 catalyst.Pure and Applied Chemistry,84(3),461-471. |
| MLA | Wang LG,et al."Environmentally benign and effective syntheses of N-substituted carbamates via alcoholysis of disubstituted ureas over TiO2/SiO2 catalyst".Pure and Applied Chemistry 84.3(2012):461-471. |
入库方式： OAI收割
来源：兰州化学物理研究所
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