摘要:
The invention provides a fluorinated aromatic sulfonic acid catalyst in which sulfonic acid groups and aryl groups substituted by fluorine atoms or fluoroalkyl groups are bound to a matrix selected from the group consisting of polysiloxane and inorganic base material. This catalyst can be produced by introducing sulfonic acid groups and aryl groups substituted by fluorine atoms or fluoroalkyl groups into the above-described matrix. This catalyst is used in various acid-catalyzed reactions such as esterification, acylation, nitration, alkylation, etherification, etc., particularly acid-catalyzed reactions in the presence of water to show a high acid catalysis activity. In addition, since this catalyst is solid, its handling is so easy that recovery and reuse thereof is easy.
摘要:
2.2-Bis-(3-nitrophenyl)hexafluorpropan wird hergestellt durch Oxidation von 2.2-Bis-(4-methylphenyl)-hexafluorpropan zu 2.2.Bis-(4-carboxyphenyl)-hexafluorpropan, Nitrierung dieser Verbindung zu 2.2-Bis-(4-carboxy-3-nitrophenyl)-hexafluorpropan und Decarboxylierung der letztgenannten Verbindung. Das Verfahren führt in technisch einfacher Weise unter Verwendung gängiger Chemikalien zu isomerenreinem 2.2-Bis-(3-nitrophenyl)-hexafluorpropan. Die Verbindung ist ein wertvolles Zwischenprodukt auf dem Polymerengebiet. Das bei dem Verfahren als Zwischenvertindung auftretende 2.2-Bis-(4-carboxy-3-nitrophenyl)-hexafluorpropan ist neu.
摘要:
To provide a catalyst for synthesis reaction which can achieve good yield in the Sonogashira reaction and also can be recovered after the reaction, and a method for synthesizing a compound in which the catalyst for synthesis reaction is used, a perovskite-type composite oxide containing palladium is used as the catalyst for synthesis reaction in the Sonogashira reaction represented by the following reaction scheme (1):
摘要:
A method is disclosed for maintaining a volumetric gas to liquid ratio in a segmented gas/liquid flow along a reactor of monolithic catalyst beds in series. The present invention includes the steps of: initiating the segmented gas/liquid flow at a first end of the reactor by introducing feed liquid and feed gas both at a predetermined volume and a predetermined flow rate; injecting an additional amount of gas at least once into any of the spaces between catalyst beds; and combining the segments of the segmented gas/liquid flow at a second end of the reactor. The injection of gas is controlled such that the segmented gas/liquid flow can be maintained near or at the Taylor regime.