Abstract:
Bis- and tris-(3-dimethylaminopropyl)-amine can be prepared by catalytic hydrogenation of 3-(dimethylamino)-propionitrile with a palladium catalyst on an Al.sub.2 O.sub.3 -containing support.
Abstract:
Aromatic and aliphatic aldehydes can be prepared from the corresponding aromatic or aliphatic carboxylic acids or the esters, anhydrides or halides thereof at elevated temperature by catalytic gas phase hydrogenation using hydrogen if use is made of a catalyst system composed of oxides of titanium and/or vanadium and of one or more co-metals, the co-metals being selected from the group consisting of chromium, molybdenum, cobalt, nickel, zinc, cadmium and copper.
Abstract:
m-Chlorotoluene is removed from chlorotoluene mixtures with a content of up to 10% by weight of m-chlorotoluene, with reference to the total amount of chlorotoluene in the mixture, by chlorinating a substantially toluene-free chlorotoluene mixture in the presence of a Friedel-Crafts catalyst and if appropriate a co-catalyst at from 0.degree. C. up to the boiling point of the mixture, until the content of m-chlorotoluene has decreased to a value of
Abstract:
In a process for the preparation of an aryloxyacetic acid by oxidation of aryloxyethanol of the formula ##STR1## wherein m represents 1 or 2,n represents the numeral which results from the difference (6-m) andR either individually or independently of one another represent hydrogen, alkyl, cycloalkyl, aryl, aralkyl, alkoxy, cycloalkoxy, aryloxy, hydroxyl, halogen, alkylcarbonyl, arylcarbonyl, carboxyl or nitro, or represent a benzene ring or cycloalkane ring fused to the phenyl ring,with oxygen or an oxygen-containing gas in an aqueous alkaline medium at a temperature from 0.degree. C. to the boiling point of the reaction mixture in the presence of platinum metals and/or palladium metals containing catalyst, the improvement which comprises carrying out the oxidation in the additional presence of an activator of lead and/or bismuth and/or a compound thereof and optionally in the additional presence of Cadmium and/or its compounds.
Abstract:
Novel process for the preparation of an arylglyoxylic acid compound, e.g., phenylglyoxylic acid, which comprises oxidizing an .alpha.-hydroxyarylacetic acid, e.g., mandelic acid, of the formula ##STR1## in which m is 1, 2 or 3,each R individually is hydrogen, alkyl, cycloalkyl,aryl, aralkyl, alkoxy, cycloakoxy, aryloxy, hydroxyl,halogen, aminoalkyl or carboxyl,with the proviso thattwo R's together can represent the methylenedioxygroup or a fused-on, optionally heterocyclic andoptionally substituted ring,with oxygen or a gas containing molecular oxygen in aqueous alkaline medium in the presence of a catalyst comprising a platinum-group metal in the presence as an activator of at least one of lead, a lead compound, bismuth and a bismuth compound at a temperature of up to the boiling point of the resulting reaction mixture.