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.
Analysis of the Orbital and Electrostatic Contributions to the Lone Pair-Aromatic Interaction Using Molecular Rotors
Karki, Ishwor,Li, Ping,Madukwe, Daniel O.,Shimizu, Ken D.,Tibbetts, Gabriel S.,Vik, Erik C.
supporting information, p. 8179 - 8182 (2021/11/13)
The attractive interaction between carbonyl oxygens and the π-face of aromatic surfaces was studied using N-phenylimide molecular rotors. The C=O···Ar interactions could stabilize the transition states but were half the strength of comparable C=O···C=O interactions. The C=O···Ar interaction had a significant electrostatic component but only a small orbital delocalization component.
Synthesis of Substituted Anilines from Cyclohexanones Using Pd/C-Ethylene System and Its Application to Indole Synthesis
Maeda, Katsumi,Matsubara, Ryosuke,Hayashi, Masahiko
supporting information, p. 1530 - 1534 (2021/03/08)
The synthesis of anilines and indoles from cyclohexanones using a Pd/C-ethylene system is reported. A simple combination of NH4OAc and K2CO3 under nonaerobic conditions was found to be the most suitable to perform this reaction. Hydrogen transfer between cyclohexanone and ethylene generates the desired products. The reaction tolerates a variety of substitutions on the starting cyclohexanones.