Unsaturated Mo in Mo<sub>4</sub>O<sub>4</sub>N<sub>3</sub> for efficient catalytic transfer hydrogenation of nitrobenzene using stoichiometric hydrazine hydrate
作者:Shicheng Luo、Yu Long、Kun Liang、Jiaheng Qin、Yi Qiao、Jing Li、Guangxue Yang、Jiantai Ma
DOI:10.1039/d1gc02647j
日期:——
Transferhydrogenation of nitroarenes to the corresponding anilines using hydrazine hydrate and non-noble metal catalysts has already been widely studied. However, the toxicity resulting from excess hydrazine hydrate and the high reaction temperature limit its industrial application. Herein, a novel N-doped molybdenum oxide compound (Mo4O4N3) was in situ prepared from g-C3N4 and (NH4)6Mo7O24·4H2O (AHM)
已经广泛研究了使用水合肼和非贵金属催化剂将硝基芳烃氢化成相应的苯胺。然而,过量的水合肼导致的毒性和高反应温度限制了其工业应用。在此,一种新型的掺杂N氧化钼化合物(莫4 ø 4 Ñ 3)为在原位从GC制备3 Ñ 4和(NH 4)6沫7 ö 24 ·4H 2 O(AHM)。制备的 Mo 4 O 4 N 3使用化学计量摩尔比的水合肼(–NO 2 : N 2 H 4 ·H 2 O = 1: 1.5)在室温下放置 50 分钟,可以实现苯胺的 99% 产率。机理实验和表征技术表明,Mo 4 O 4 N 3中不饱和Mo的酸性位点可以有效地激活N 2 H 4分子,形成活性氢物种,用于硝基芳烃的催化转移加氢,而不会产生有害的NH 3。此外,Mo 4 O 4 N 3在无溶剂的大规模反应中仍表现出优异的催化性能。这项工作可能为芳胺生产提供一种可行且有效的策略。
A metal-free heterogeneous photocatalyst for the selective oxidative cleavage of CC bonds in aryl olefins <i>via</i> harvesting direct solar energy
作者:Yu Zhang、Nareh Hatami、Niklas Simon Lange、Emanuel Ronge、Waldemar Schilling、Christian Jooss、Shoubhik Das
DOI:10.1039/d0gc01187h
日期:——
transition metal-free) to avoid further leaching in the final products. This is for sure a big challenge to an organic chemist and to the pharmaceutical industries! To make this feasible, a mild and efficient protocol has been developed using polymericcarbonnitrides (PCN) as metal-free heterogeneous photocatalysts to convert various olefins into the corresponding carbonyls. Later, this catalyst has been
C C键的选择性裂解对于合成含羰基的精细化学品和药物非常重要。新型方法,例如臭氧分解反应,Lemieux-Johnson氧化反应等。已经存在。与此平行,还发现了使用均相催化剂的催化方法。考虑到非均相催化剂的各种优点,例如可循环性和稳定性,已将几种基于过渡金属的非均相催化剂用于该反应。但是,制药行业更喜欢使用不含金属的催化剂(尤其是不含过渡金属的催化剂),以避免最终产品中进一步浸出。对于有机化学家和制药行业来说,这无疑是一个巨大的挑战!为了使之可行,已经开发了一种温和而有效的方案,使用聚合碳氮化物(PCN)作为无金属的非均相光催化剂,将各种烯烃转化为相应的羰基。后来,该催化剂已被用于使用直接太阳能的克级合成药物中。详细的机械研究揭示了氧气,催化剂和光源的实际作用。
Metal-free photocatalytic aerobic oxidation of biomass-based furfural derivatives to prepare γ-butyrolactone
作者:Rui Zhu、Gongyu Zhou、Jia-nan Teng、Wanying Liang、Xinglong Li、Yao Fu
DOI:10.1039/d0gc04234j
日期:——
Efficient catalytic oxidative C–C bond cleavage with dioxygen is useful and challenging to prepare oxygenated fine chemicals from biomass. Herein, we report a catalytic strategy for the preparation of γ-butyrolactone (GBL) by photocatalytic oxidation of tetrahydrofurfuryl alcohol (THFA), tetrahydrofurfuric acid (THFCA), or other furfural derivatives at room temperature under visible-light irradiation
Sustainable visible light assisted <i>in situ</i> hydrogenation <i>via</i> a magnesium–water system catalyzed by a Pd-g-C<sub>3</sub>N<sub>4</sub> photocatalyst
作者:Priti Sharma、Yoel Sasson
DOI:10.1039/c8gc02221f
日期:——
generation process via a “magnesium-activated water” system with a Pd-g-C3N4 photocatalyst under visible light at room temperature. Water functions photochemically as a hydrogen donor without any external source with the Pd-g-C3N4 photocatalyst. The synthesized Pd-g-C3N4 photocatalyst is highly efficient under visible light for the selective reduction of a wide range of unsaturated derivatives and nitro compounds
通过在室温下可见光下使用Pd-gC 3 N 4光催化剂的“镁活化水”系统制定了一种无害且相对温和的方案,以有效地制氢。Pd-gC 3 N 4光催化剂在没有任何外部来源的情况下,水在化学上起着氢供体的作用。合成的Pd-gC 3 N 4光催化剂在可见光下非常有效,可以选择性还原各种不饱和衍生物和硝基化合物,从而提供优异的收率(> 99%)。光催化剂Pd-gC 3 N 4 在光化学氢转移反应过程中,可以很容易地回收并重复使用几次,而不会发生任何失活。
Highly Efficient Photo-Reduction of <i>p</i>
-Nitrophenol by Protonated Graphitic Carbon Nitride Nanosheets
Photocatalytic reduction of p‐nitrophenol to p‐aminophenol is important because of the high toxicity of p‐nitrophenol and the wide application of p‐aminophenol. Graphiticcarbonnitride (g‐CN) is an excellent photocatalyst for various photo‐reduction reactions, but inefficient for photo‐reduction of p‐nitrophenol due to the electrostatic exclusion. In this work, we control the morphology and surface