With a tandem DMAP-catalyzed reaction between o-AQM, in which it is generated in situ from propargylic amine, and acyl carbene surrogate (from pyridinium ylide), a variety of polyarylated chromenes are assembled in good yields. This process does not require transition-metal catalyst and exhibits easy manipulation of the arene group and good functional group compatibility, particularly the −Br group
Structural Diversity and Catalytic Properties in a Family of Ag(I)-Benzotriazole Based Coordination Compounds
作者:Edward Loukopoulos、Alaa Abdul-Sada、Eddy M. E. Viseux、Ioannis N. Lykakis、George E. Kostakis
DOI:10.1021/acs.cgd.8b00960
日期:2018.9.5
their variety coordination abilities. Interestingly, certain structures exhibit an isomerism effect (L1T-L3T) in the benzotriazole unit when in solid state; a series of studies are indicative of the 1,1-form which is generally dominant in solution even in cases where the crystal structure does not contain this tautomer. The homogeneous catalytic efficacy of all compounds against the well-known multicomponent
在这项工作中,我们研究了一系列基于半刚性苯并三唑的配体(L 1 –L 3)的配位化学,以及低配位数但用途广泛的Ag I离子。这导致了九种新的配位化合物[Ag(L 1)(CF 3 CO 2)](1),[Ag 2(L 1T)2(CF 3 SO 3)2 ]·2Me 2 CO(2), [Ag(L 2T)(ClO 4)(Me 2 CO)](3),[Ag(L 2T)(BF4)(Et 2 O)](4),[Ag 2(L 3T)2(ClO 4)2 ] 2(5),[Ag(L 3)(NO 3)](6),[Ag 2( L 3T)2(CF 3 CO 2)2 ](7),[Ag 2(L 3T)(CF 3 SO 3)2 ](8)和[Ag 2(L 3T)2(CF 3 CF 2 CO 2)2 ]·2Me 2 CO(9)。这些化合物显示出结构的多样性,包括二聚体(5,7,9)和一维(1D)(3,4,6)和二维(2D)(1,2,
Improving the Catalytic Activity of Au<sub>25</sub>
Nanocluster by Peeling and Doping
作者:Man-bo Li、Shi-kai Tian、Zhikun Wu
DOI:10.1002/cjoc.201600526
日期:2017.5
the novel cadmium doped goldnanocluster Au26Cd5 shows high catalyticactivity, as well as good recyclability and substrate tolerance for the same reaction. The high catalyticactivity is attributed to the cooperation between the exerted cadmium atoms and the neighbor goldatoms on the surface of Au13 icosahedron. This work has important implication for the tuning of nanoclusters’ compositions and structures
调整纳米团簇的组成和结构对于提高纳米团簇的性能至关重要。在此,著名的Au 25(SCH 2 CH 2 Ph)18(简称Au 25)纳米簇已转变为稀有的掺杂镉的金纳米簇[Au 13 Cd 2(PPh 3)6(SC 2 H 4 Ph)6(NO 3)2 ] 2 Cd(NO 3)4(简称Au 26 Cd 5)通过剥离和掺杂。虽然金25在研究条件下对A 3偶联反应没有催化活性,新型镉掺杂金纳米簇Au 26 Cd 5表现出高催化活性,并且对同一反应具有良好的可回收性和底物耐受性。高催化活性归因于所施加的镉原子与Au 13二十面体表面上的相邻金原子之间的协作。这项工作对于通过一些不寻常但有效的策略来改进纳米团簇的组成和结构具有重要的意义。
A ZnI<sub>2</sub>-catalyzed regioselective cascade 1,4-conjugate addition/5-<i>exo-dig</i> annulation pathway for one-pot access to heterobiaryl frameworks
A DMAP-catalyzed cascadeapproach allowing facile assembly of alkynyl coumarins is reported. By virtue of reactive o-AQM (in situ generated from modular propargylamine) and a new synthetic equivalent of acyl carbene (from pyridinium ylide), the reaction proceeds smoothly to afford a variety of alkynyl coumarins in good-to-excellent yields. This transition-metal-free and oxidant-free process features