PROCESS FOR PREPARING N-METHYL-BIS-(2,4-XYLYLIMINOMETHYL)-AMINE

The invention relates to a process for preparing N-methyl-bis-(2,4-xylyliminomethyl)amine by the reaction of condensation of 2,4-dimethylaniline with N-methylformamide and thionyl chloride in toluene, said reaction taking place at 2,4-dimethylaniline : N-methylformamide : thionyl chloride mole ratios of 1 : 15 : 1.5, at a temperature of 66...68 C, followed by the separation of the raw 2,4-diphenyl-N-methyl-formamide by recrystallization from cyclohexane which is then refluxed in xylene at 136...138 C, for 36 hours, at a concentration of 20 g/100 ml of solvent, in the presence of p-toluenesulphonic acid, and, finally, by the isolation of the N-methyl-bis-(2,4-xyliyliminomethyl)formamide by recrystallization from ethyl alcohol. Invenţia se referă la un procedeu de obţinere a N-metil-bis-(2,4-xililiminometil)-aminei, prin reacţia de condensare a 2,4-dimetilanilinei cu N-metilformamidă şi clorură de tionil, în toluen, care seefectuează la rapoarte molare 2,4-dimetilanilină:N-metilformamidă: clorură de tionil de 1:15 :1,5, la temperatura de 66...68°C, urmată de separarea 2,4-difenil-N-metil-formamidei brute, prin recristalizare, din ciclohexan, care apoi se refluxează în xilen, la 136...138°C, timp de 36 h, la o concentraţie de 20 g/100 ml de solvent, în prezenţa acidului p-toluensulfonic şi, în final, de izolarea N-metil-bis-(2,4-xililiminometil)formamidei prin recristalizare, din alcool etilic. ŕ