Model Guided Development of a Simple Catalytic Method for the Synthesis of Unsymmetrical Stilbenes by Sequential Heck Reactions of Aryl Bromides with Ethylene
作者:Helen Barlow、Jonas Y. Buser、Hendrik Glauninger、Carla V. Luciani、Joseph R. Martinelli、Niall Oram、Nichole Thompson‐Van Hook、Jeffery Richardson
DOI:10.1002/adsc.201800167
日期:2018.7.16
moieties, but methods for their preparation typically possess numerous inefficiencies. Presented here is a methodology for the two‐step, one pot preparation of unsymmetrical stilbenes via sequential Heck reactions. The first Heck reaction with ethylene gas was analysed as a function of temperature and pressure for electronically differentiated naphthyl bromides and model‐aided reaction optimization was utilized
Evidences of release and catch mechanism in the Heck reaction catalyzed by palladium immobilized on highly cross-linked-supported imidazolium salts
作者:Cinzia Pavia、Francesco Giacalone、Lucia Anna Bivona、Anna Maria Pia Salvo、Chiara Petrucci、Giacomo Strappaveccia、Luigi Vaccaro、Carmela Aprile、Michelangelo Gruttadauria
DOI:10.1016/j.molcata.2014.02.025
日期:2014.6
Palladium (10 wt%) on a highly cross-linkedimidazolium-basedmaterial was used as catalyst in 0.1 mol% in the Heck reaction between several alkenes and aryl iodides. Products were obtained from good to high yields. Deeper investigations showed a release of Pd species in solution and their capture by the imidazolium-based support. When a sixfold amount of support was employed the re-captured Pd species
Palladium Nanoparticles Immobilized on Nano-Silica Triazine Dendritic Polymer (Pd<sub><i>np</i></sub>-nSTDP): An Efficient and Reusable Catalyst for Suzuki-Miyaura Cross-Coupling and Heck Reactions
作者:Amir Landarani Isfahani、Iraj Mohammadpoor-Baltork、Valiollah Mirkhani、Ahmad R. Khosropour、Majid Moghadam、Shahram Tangestaninejad、Reza Kia
DOI:10.1002/adsc.201200707
日期:2013.3.25
Suzuki–Miyaura cross‐coupling of aryl iodides, bromides and chlorides with arylboronic acids and also in the Heck reaction of these aryl halides with styrenes. These reactions were best performed in a dimethylformamide (DMF)/water mixture (1:3) in the presence of only 0.006 mol% and 0.01 mol% of the catalyst, respectively, under conventional conditions and microwaveirradiation to afford the desired coupling
An efficient Pd–NHC catalyst system in situ generated from Na<sub>2</sub>PdCl<sub>4</sub> and PEG-functionalized imidazolium salts for Mizoroki–Heck reactions in water
作者:Nan Sun、Meng Chen、Liqun Jin、Wei Zhao、Baoxiang Hu、Zhenlu Shen、Xinquan Hu
DOI:10.3762/bjoc.13.168
日期:——
PEG-functionalized imidazolium salts L1-L3 were designed and prepared from commercially available materials via a simple method. Their corresponding water soluble Pd-NHC catalysts, in situ generated from the imidazolium salts L1-L3 and Na2PdCl4 in water, showed impressive catalytic activity for aqueous Mizoroki-Heck reactions. The kinetic study revealed that the Pd catalyst derived from the imidazolium salt L1
methods, and single crystal X-ray crystallographic technique. The new and reusable homogeneous catalyst has been effectively applied to the Mizoroki–Heck reaction of activated and deactivated arylbromides with various olefins under mild reaction conditions in good to excellent yields up to 99%.