共查询到20条相似文献,搜索用时 15 毫秒
1.
综述了脂肪酸酯催化加氢制备脂肪醇的催化剂和工艺条件研究现状。重点阐述了铜基催化剂以及反应条件温和、高活性的贵金属催化剂用于催化加氢的研究进展。指出了脂肪酸酯催化加氢制脂肪醇工艺存在的问题。提出了开发环境友好的新型催化剂是未来的发展趋势。 相似文献
2.
Wing‐Sze Lam StantonH.L. Kok TerryT.‐L. Au‐Yeung Jing Wu Hong‐Yee Cheung Fuk‐Loi Lam Chi‐Hung Yeung AlbertS.C. Chan 《Advanced Synthesis \u0026amp; Catalysis》2006,348(3):370-374
P‐Phos‐ruthenium‐DPEN precatalysts have been found to be efficient for the asymmetric hydrogenation of various ferrocenyl ketones. The use of (R)‐xylyl‐P‐PhosRuCl2(R,R)‐DPEN generated chiral ferrocenylethanol in 99.3% e.e. with >99% conversion in a 150‐g scale. 相似文献
3.
4.
《高校化学工程学报》2015,(6)
在催化剂作用和氢气气氛下,经过偶氮化合物加氢还原、脱水环化和加氢脱氧合成苯并三氮唑类紫外吸收剂。相比于化学还原合成方法,催化加氢路线具有原子经济性高、环境友好的特点。通过研究催化加氢合成苯并三氮唑类紫外吸收剂主反应和副反应发生的过程,修改了反应机理,增加了共轭碳碳双键加氢的副反应路线。考察了碱性助剂有效提高目标产物选择性的作用机制。提出了活性氢物种对氮氧化物的还原是引起其开环生成两分子芳胺副产物的主要诱因,三氮唑环与相邻苯环形成的共轭双烯结构的过度加氢生成了四氢副产物。 相似文献
5.
6.
7.
8.
The chiral benzofuranone structural motif is a prominent feature in many natural products, which exhibit a broad range of biological and pharmaceutical activities. In the past few years, a survey of chiral benzofuranone derivatives based on asymmetric catalysis reveals an increasing number of papers, which reflects the latest achievements to facilitate the synthesis of sufficient quantities of related compounds as potential medicinal agents and biological probes. Recent advances in this area are summarized and classified according to the structure of the starting substrate.
9.
10.
11.
12.
13.
Ruizhu Mu Zhongquan Liu Zhanjun Yang Zhengang Liu Longmin Wu Zhong‐Li Liu 《Advanced Synthesis \u0026amp; Catalysis》2005,347(10):1333-1336
A transition metal‐free aerobic oxidation of alcohols to the corresponding aldehydes or ketones can be effectively catalysed by iodoxybenzene (PhIO2)/Br2/NaNO2 in water. 相似文献
14.
15.
催化加氢还原法制备甲萘胺 总被引:1,自引:0,他引:1
提出了以1-硝基萘为原料,使用Pt/C为催化剂,在90℃、2.0-3.0MPa氢气压力下,催化还原制备甲萘胺.所得甲萘胺纯度大于99.8%,收率可达97.6%。 相似文献
16.
17.
AngelaC. Olson LarryE. Overman HelenF. Sneddon JosephW. Ziller 《Advanced Synthesis \u0026amp; Catalysis》2009,351(18):3186-3192
The first di‐μ‐amidate dipalladium complexes and a new di‐μ‐carboxylate dipalladium complex of the COP (cobalt oxazoline palladacycle) palladium(II) catalyst family are reported and characterized crystallographically. The di‐μ‐amidate complex 3 and its enantiomer (ent‐ 3 ) are the first asymmetric catalysts that allow commercially available, or readily accessible, (E)‐2‐alken‐1‐ols to be transformed to enantioenriched branched allylic aryl ethers upon reaction of their trichloroacetimidate derivatives with phenols. The 3‐aryloxy‐1‐alkene products are formed in high enantiomeric purity (typically 90–98% ee) and useful yields (61–88%). 相似文献
18.
催化氢化法合成对氨基苯甲醚 总被引:1,自引:0,他引:1
本文采用氨合成气代替纯氢气对催化氢化制备对氨基苯甲醚进行了详细的研究,对反应条件进行了优化,取得了较理想结果。通过文献检索,本文研究目前在国内外尚无文献报道。 相似文献
19.
以Ni/SiO2作催化剂,研究了反应温度、反应压力、溶剂种类等因素对产品收率的影响,得到的优化反应条件为:反应温度为57.5℃,反应压力为0.85 MPa,溶剂种类为甲醇,邻苯二胺收率稳定在95%以上,质量分数大于98%。 相似文献