Process for the hydrolysis of carboxylic acid nitriles in the presence of a catalyst of manganese dioxide

摘要

Process for the catalytic hydrolysis of nitriles of carboxylic acids or SH-substituted SR- the fórmulageneral R1-CR2R3-CN, to form the corresponding carboxamides, wherein R1, R2 and R3pueden be the same or different and are hydrogen, the least one substituted SH, SR- or hydrocarbon radical selected from the group consisting of an alkyl radical C1 to C10 linear or optionally branched, an aryl radical C6 AC10, a C4 to C8 heteroaryl radical containing O, N and / or S, or an aralkyl radical C7 to C12, and R3 eseventualmente a hydroxyl radical, and the radical R is an alkyl C1 to C4 linear or eventualmenteramificado, an aryl radical C6 to C10, a heteroaryl radical C4-C8 containing O, N and / or S or radicalaralquilo C7 to C12, and wherein the hydrolysis is carried out using a catalyst of manganesoque dioxide contains at least 52% by weight of manganese and additionally at least one compound of the lanthanides, and lithium, sodium, potassium, rubidium or cesium, and has a BET specific surface area of ​​50 to 550m2 / g, of the general formula: MnMexMyOz, where x is a number between 0.05 and 0.002, and is a number between 0.06 and 0.02 z is a number from 1.7 to 2.0, me represents at least one element of the lanthanides, M represents an alkali metal lithium group, sodium, potassium, rubidium, cesium and optionally water is contained additional hydration.