An efficient and recyclable water-soluble cyclopalladated complex for aqueous Suzuki reactions under aerial conditions
作者:Jin Zhou、Xiaoyan Li、Hongjian Sun
DOI:10.1016/j.jorganchem.2009.09.039
日期:2010.1
complexes with six-membered rings show high catalytic efficiency for the Suzukireactions of aryl bromides with phenylboronic acid in aqueous solvents under mild conditions. Palladium complex 1 can be used for five reaction cycles in high conversions for the Suzukireactions in neat water without additives. The catalytic process for the Suzuki couplings is proved by TEM analysis to proceed on Pd(0) nanoparticles
Water-Soluble Palladacycles as Precursors to Highly Recyclable Catalysts for the Suzuki Coupling of Aryl Bromides in Aqueous Solvents
作者:Rongcai Huang、Kevin H. Shaughnessy
DOI:10.1021/om050940y
日期:2006.8.1
A family of water-soluble palladacycles was prepared from benzylamine or benzaldehyde imine ligands bearing hydrophilic functional groups. The palladacycles derived from N,N-dimethyl-p-hydroxybenzylamine (7) and sodium 4-(N-benzylideneamino) benzenesulfonate (10) gave active catalysts for the Suzuki coupling of aryl bromides and activated aryl chlorides in combination with (2-di-tert-butylphosphinoethyl)trimethylammonium chloride (t-Bu-Amphos). The catalyst derived from 10/t-Bu-Amphos could be used for 12 reaction cycles in the Suzuki coupling of 4-bromotoluene at 80 degrees C before a significant loss of catalyst activity was observed.
A Hydrolyzable Supra‐amphiphile as a Marangoni Self‐Propulsion Fuel for Efficient Macroscopic Supramolecular Self‐Assembly
作者:Guoxin Lu、Guiqiang Zhu、Qian Zhang、Pan Tian、Mengjiao Cheng、Feng Shi
DOI:10.1002/anie.202300448
日期:2023.4.3
AbstractSelf‐assembly of μm‐to‐mm components is important for achieving all‐scale ordering with requirements of extra energy for motion and interaction of components. Marangoni flows caused by surfactants on water provide appropriate energy but have limited lifetimes because of the inevitable interfacial aggregation and difficult decomposition of aggregated covalent surfactants that inactivate Marangoni effects. Here we have synthesized a supra‐amphiphile Marangoni “fuel”—sodium‐4‐(benzylideneamino) benzenesulfonate (SBBS)—that can be hydrolyzed in a timely manner to a species without surface activity to extend the motion time by 10‐fold. The motion was optimized at pH=2 by a fine equilibrium between the releasing and removal of interfacial SBBS, leading to the self‐assembly of millimeter‐scaled ordered dimers. The underlying mechanism was interpreted by motion analyses and simulation. This strategy provides an active solution to self‐assembly at the μm‐to‐mm scale, as well as interactive ideas between miniaturized chemical robots.