Hydrogenation of <i>N</i>-Heteroarenes Using Rhodium Precatalysts: Reductive Elimination Leads to Formation of Multimetallic Clusters
作者:Sangmin Kim、Florian Loose、Máté J. Bezdek、Xiaoping Wang、Paul J. Chirik
DOI:10.1021/jacs.9b09540
日期:2019.11.6
addi-tion, the hydrogenation of polyaromatic N-heteroarenes exhibited uncommon chemoselectivity. Studies into catalyst activation revealed that photochemical or thermal activation of (η5-C5Me5)Rh(bq)H induced C(sp2)-H reductive elimination and generated the bimetallic complex, [(η5-C5Me5)Rh(µ2,η2-bq)Rh(η5-C5Me5)H]. In the presence of H2 both of the (η5-C5Me5)Rh(N-C)H precursors and [(η5-C5Me5)Rh(µ2,η2-bq)Rh(η5-C5Me5)H]
[EN] RHENIUM COMPLEXES AND METHODS OF USE FOR TREATING CANCER<br/>[FR] COMPLEXES DE RHÉNIUM ET MÉTHODES D'UTILISATION POUR LE TRAITEMENT DU CANCER
申请人:UNIV CORNELL
公开号:WO2017223428A1
公开(公告)日:2017-12-28
A composition comprising the following structure: (formula I) wherein Re represents a rhenium ion having a +1 charge; (formula II) represents an uncharged bidentate bicyclic ligand bonded to the rhenium (Re) by two ring nitrogen (N) atoms; and L is a neutral ligand independently selected from CO and neutral phosphine molecules, wherein at least one of the L groups is a CO molecule; and X- represents a non-coordinating monovalent anion; wherein (formula II) is unsubstituted or substituted on any of its two rings, and said neutral phosphine molecule may or may not contain a phosphorus atom as a ring phosphorus atom; provided that, if (formula II) is unsubstituted, then one or two of said L groups are selected from said neutral phosphine molecules, with the provision that at least one of the neutral phosphine molecules has a phosphorus atom as a ring phosphorus atom. Methods for treating cancer by administering the above complex are also disclosed.
Cu ion-exchanged and Cu nanoparticles decorated mesoporous ZSM-5 catalysts for the activation and utilization of phenylacetylene in a sustainable chemical synthesis
SBA-15, and Al2O3 samples were also prepared. A sustainable catalytic process was developed for the selectivesynthesis of indolizine, chalcone, and triazole derivatives using a mesoporous ZSM-5 based heterogeneous catalyst. A multi-component synthetic strategy is reported here for the selectivesynthesis of the above mentioned chemicals that involves phenylacetylene as one of the building blocks. Control
使用1,4-二氮杂双环[2.2.2]辛烷基多阳离子表面活性剂作为结构导向剂合成介孔ZSM-5。通过离子交换法制备了Cu 2+交换介孔ZSM-5。使用NaBH 4作为还原剂,制备了装饰有介孔ZSM-5的Cu纳米粒子。通过X射线衍射,N 2吸附,紫外可见光和扫描/透射电子显微镜技术的互补组合来表征材料。为了进行比较,Cu 2+交换了ZSM-5,HY和NaY。和铜纳米颗粒装饰了常规的ZSM-5,SBA-15和Al 2 O 3还准备了样品。开发了一种可持续的催化方法,用于使用介孔ZSM-5基非均相催化剂选择性合成吲哚嗪,查尔酮和三唑衍生物。本文报道了一种多组分合成策略,用于上述涉及苯乙炔作为结构单元之一的化学品的选择性合成。进行对照实验以确定提出的反应途径。进行了回收和浸出实验,以证明催化过程的可持续性和稳健性。在这些催化剂中,装饰有中孔ZSM-5的Cu纳米颗粒在所有这些反应中均表现出最高的活性。
Using Methanol as a Formaldehyde Surrogate for Sustainable Synthesis of
<scp>
<i>N</i>
‐Heterocycles
</scp>
via
<scp>Manganese‐Catalyzed</scp>
Dehydrogenative Cyclization
作者:Zhihui Shao、Shanshan Yuan、Yibiao Li、Qiang Liu
DOI:10.1002/cjoc.202100886
日期:2022.5.15
The development of an efficient and sustainable synthetic route for formaldehyde production from renewable feedstock, especially in combination with a subsequent transformation to straightforwardly construct valuable chemicals, is highly desirable. Herein, we report a novel manganese-catalyzed dehydrogenativecyclization of methanol as a formaldehyde surrogate with a variety of dinucleophiles for facile
Visible Light Induced Green Transformation of Primary Amines to Imines Using a Silicate Supported Anatase Photocatalyst
作者:Sifani Zavahir、Huaiyong Zhu
DOI:10.3390/molecules20021941
日期:——
Catalytic oxidation of amine to imine is of intense present interest since imines are important intermediates for the synthesis of fine chemicals, pharmaceuticals, and agricultural chemicals. However, considerable efforts have been made to develop efficient methods for the oxidation of secondary amines to imines, while little attention has until recently been given to the oxidation of primary amines, presumably owing to the high reactivity of generated imines of primary amines that are easily dehydrogenated to nitriles. Herein, we report the oxidative coupling of a series of primary benzylic amines into corresponding imines with dioxygen as the benign oxidant over composite catalysts of TiO2 (anatase)-silicate under visible light irradiation of λ > 460 nm. Visible light response of this system is believed to be as a result of high population of defects and contacts between silicate and anatase crystals in the composite and the strong interaction between benzylic amine and the catalyst. It is found that tuning the intensity and wavelength of the light irradiation and the reaction temperature can remarkably enhance the reaction activity. Water can also act as a green medium for the reaction with an excellent selectivity. This report contributes to the use of readily synthesized, environmentally benign, TiO2 based composite photocatalyst and solar energy to realize the transformation of primary amines to imine compounds.