- Aryl couplings with heterogeneous palladium catalysts
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The coupling reaction of diverse phenylboronic acids with aryl halogenides and -triflates has been performed by the use of simple palladium hydrogenation catalysts. Evidence for a heterogeneous type of catalysis has been obtained.
- Marck, Guy,Villiger, Alois,Buchecker, Richard
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- Synthetic method of directly coupling aryl halide by aromatic hydrocarbon Grignard reagent in the presence of recycled modified palladium-charcoal
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The invention provides a synthetic method of directly coupling aryl halide by an aromatic hydrocarbon Grignard reagent. The synthetic method includes performing reflux and water separation of a catalyst Pd/C and an azeotropic organic solvent of non-halogenated hydrocarbon and water, adding an organic phosphine ligand, performing a complexation reaction to obtain a catalyst organic phosphine ligand complexing Pd/C, using aryl halide as an initial material, performing a Grignard reaction at 10-90 DEG C to obtain a Grignard reagent, adding the catalyst, performing a coupled reaction of aryl halide and the Grignard reagent to obtain a coupling aromatic hydrocarbon. The synthetic method uses one-step method, has low synthesis cost, is green and environmental friendly, and is a high-efficiency and clean synthetic technology of coupling aryl halide.
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Paragraph 0015; 0016; 0017; 0018
(2016/10/08)
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- COMPOUND HAVING 2-FLUOROPHENYLOXYMETHANE STRUCTURE
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The present invention relates to a compound having a 2-fluorophenyloxymethane structure and useful for organic electronic materials and medical and agricultural chemicals, particularly materials for liquid crystal display elements. A problem to be solved
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Paragraph 0095
(2014/09/30)
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- LIQUID CRYSTALLINE COMPOUND, LIQUID CRYSTAL COMPOSITION, LIQUID CRYSTAL DISPLAY ELEMENT
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The invention provides a liquid crystal compound which has stability to heat, light and so forth, shows liquid crystal phases in a wide temperature range, and has a small viscosity, an appropriate optical anisotropy, a large dielectric anisotropy, and an
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Page/Page column 50
(2009/12/07)
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