90-41-5Relevant articles and documents
Novel iota carrageenan-based RhCl3 as an efficient and recyclable catalyst in Suzuki cross coupling
Leviev, Sivan,Levy-Ontman, Oshrat,Wolfson, Adi
, (2020)
RhCl3 was heterogenized into renewable polysaccharide supports, and the effect of polysaccharide type on the new catalyst performances in a Suzuki cross-coupling reaction was studied. The conversion of the fresh iota carrageenan heterogeneous system (?-RhCl3), was found to be the highest, whereas it was lower than the conversion of its homogeneous analogue. In addition, the ?-RhCl3 (catalyst loading of 6.5 % wt) was proven to be efficient heterogeneous catalyst that was easily recycled, whereas the conversion was increased in the first and second cycles. Scanning electronic microscopy (SEM) combining Energy dispersive X-ray spectrometry and Surface analysis by X-ray photoelectron spectroscopy were performed, confirming that RhCl3 was embedded within the ?-carrageenan. The Fourier-transform infrared spectrometry of the heterogeneous ?-RhCl3 catalyst was compared to that of the native polysaccharide, and no new bands were detected. Nonetheless, a comparison of SEM image of ?-carrageenan with and without RhCl3, as well as rheological measurements of the aqueous solution of ? with and without RhCl3, indicated the incorporation of the polysaccharide with the RhCl3.
Pd nanoparticles in hollow magnetic mesoporous spheres: High activity, and magnetic recyclability
Sun, Jian,Dong, Zhengping,Sun, Xun,Li, Ping,Zhang, Fengwei,Hu, Wuquan,Yang, Haidong,Wang, Haibo,Li, Rong
, p. 46 - 51 (2013)
The nanoreactor of hollow magnetic mesoporous silica spheres (Pd/HMMS), with Pd and Fe3O4 nanoparticles embedded in the mesoporous silica shell, were successfully prepared by using the colloidal carbon spheres of glucose, Pd and Fe3O4 heteroaggregates as the hard template together with a coating of tetraethoxysilane (TEOS) and cetyltrimethylammonium bromide (CTAB) mixture. The synthesized Pd/HMMS shows excellent catalytic activity in the Suzuki cross-coupling reaction of iodobenzene with phenylboronic acid with over 99% yield in 3 min and can be recycled multiple times without any significant loss in catalytic activity.
A selective luminescent probe for the direct time-gated detection of adenosine triphosphate
Weitz, Evan A.,Chang, Jennifer Y.,Rosenfield, Adam H.,Pierre, Valerie C.
, p. 16099 - 16102,4 (2012)
A molecular probe for the luminescent detection of adenosine nucleotides is presented. The probe, Tb-DOTAm-Phen, readily distinguishes among the three adenosine nucleotides in buffered aqueous conditions at neutral pH, a requirement for the direct monitoring of enzymatic reactions converting adenosine triphosphate (ATP) to adenosine diphosphate or adenosine monophosphate. The probe is most efficient under millimolar concentrations of ATP which are relevant to intracellular conditions. Moreover, the long luminescence lifetime of the probe readily enables time-gating experiments.
Preparation method of 2-aminobiphenyl derivative and 2-hydroxybiphenyl derivative
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Paragraph 0024-0033, (2021/06/12)
The invention relates to a preparation method for synthesizing a 2-aminobiphenyl derivative and a 2-hydroxybiphenyl derivative, wherein the preparation method comprises the steps: adding a 2-halogenated aniline derivative or a 2-halogenated phenol derivative and a substituted arylboronic acid derivative into an organic solvent at a certain temperature, reacting under the action of a catalyst polyaryl substituted m-phenylenediamine and alkali, and finally obtaining the product 2-aminobiphenyl derivative or 2-hydroxybiphenyl derivative. According to the method, the 2-aminobiphenyl derivative and the 2-hydroxybiphenyl derivative are prepared through the organic secondary amine catalytic reaction, the preparation method is safer and more convenient, the production cost is low, the total yield is high, the catalyst can be recycled, few three wastes are generated, and industrialization is facilitated.
Catalyst-free synthesis of phenanthridinesviaelectrochemical coupling of 2-isocyanobiphenyls and amines
Malviya, Bhanwar Kumar,Singh, Karandeep,Jaiswal, Pradeep K.,Karnatak, Manvika,Verma, Ved Prakash,Badsara, Satpal Singh,Sharma, Siddharth
, p. 6367 - 6378 (2021/04/16)
Catalyst free synthesis of 6-aryl phenanthridines and amides through an electrochemical reaction is reported in this study. The coupling reaction proceeds by the cathodic reduction ofin situformed diazonium ions, which are formed from anilines and an alkyl nitrite. The generated aryl radical diazonium ions coupled from isocyanides furnished the desired products in good yields. This cascade reaction was conducted in an undivided cell equipped with an RVC as the anode and Pt as the cathode usingnBu4NBF4as the electrolyte at room temperature. A series of detailed mechanistic studies have also been performed, including a radical clock experiment and cyclic voltammetry analysis.