Preparation of pyrazole by Catalonia hydrogenation

摘要

Are you referring to a Catalan process for the manufacture of a pyrazol compound or one of its salts, stereoisomers, ceramics or positive oxidants in V, including the cyclization stage of a carbon compound? What? -Through the reaction of hydrogen, type IV hydrogen is used to replace the unsaturated state, in which type IV compound is composed of a reaction mixture: (a) a hydrogenation catalyst, (b) an acid selected from br ø nsted Acid, Br ø nsted Acid Ammonium Salt and Lewis acid salt, (c) 1. Proton and optional solvent (d) are passable solvents, R1 is C (o) orc, RC is C1-C4 or bencilo;R2 is CH3 or fluorination; R3 is h; R4 is C1-C4, its group is not replaced or partially halogenated; R5 is C1-C4.