| Environmentally benign and effective syntheses of N-substituted carbamates via alcoholysis of disubstituted ureas over TiO2/SiO2 catalyst | |
| Department | 绿色化学研究发展中心 |
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; Deng YQ(邓友全)
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| 2012 | |
| Source Publication | Pure and Applied Chemistry
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| ISSN | 0033-4545 |
| Volume | 84Issue:3Pages:461-471 |
| Abstract | 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. |
| Keyword | Alcoholysis Disubstituted Ureas N-substituted Carbamates Tio2/sio2 Phosgene-free |
| Subject Area | 物理化学与绿色催化 |
| DOI | 10.1351/PAC-CON-11-05-06 |
| Funding Organization | Partial financial support from Bayer MaterialScience |
| Indexed By | SCI |
| If | 3.386 |
| Language | 英语 |
| Funding Project | 绿色催化课题组 |
| compositor | 第一作者单位 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/3702 |
| Collection | 绿色化学研究发展中心 |
| Corresponding Author | Deng YQ(邓友全) |
| Affiliation | 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 |
| Recommended Citation 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.,...&邓友全.(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. |
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| 王利国-Pure and Applied（2882KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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