http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0870756-A1

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assignee http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a5c0613e7aa38b6dd780e9b2bf270445
classificationCPCInventive http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C209-18
classificationIPCInventive http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C209-18
filingDate 1998-04-06-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a5b7e6fe53d1b9e5362f788e110337a0
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8b35d3e0bb0144a8dd70fee014fd9102
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8bb0b44fc4f0e7e1d9561c1bd162ab13
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_080d8cb579af952fcbc41ee953defc4c
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6e3575a8c2b3a1a707fb002aafd779ce
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_28d9ed96d4bf659655e652a596a4caba
publicationDate 1998-10-14-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber EP-0870756-A1
titleOfInvention Process for the preparation of 3,4-disubstituted dinitroanilines
abstract R 1 et R 2 , qui sont identiques ou différents l'un denl'autre, représentent un atome d'hydrogène, un radicalnalkyle rectiligne ou ramifié saturé en C 1 à C 6 , un radicalnalkylène linéaire ou ramifié en C 2 à C 6 , un radicalncyclopropyle ou un radical chloroéthyle, R 3 et R 4 , qui peuvent être identiques ou différentsnl'un de l'autre, sont choisis dans le groupe comprenantnl'atome de chlore, le groupe amino, les radicaux alkyleninférieurs en C 1 à C 3 et le radical trifluorométhyle,ncomprenant successivement une étape de dinitration d'unnphénol 3,4-disubstitué, une étape d'alkylation du dérivéndinitré ainsi obtenu et une étape d'amination du 2,6-dinitro-alcoxybenzènen3,4-disubstitué ainsi obtenu etncaractérisé par le fait que: l'étape de dinitration du phénol 3,4-disubstituéncorrespondant à la dinitroaniline 3,4-disubstituéenrecherchée est effectuée au sein d'un milieu réactionnelncomprenant un faible excès d'agent nitrant, une quantiténsuffisante de protons et un catalyseur choisi dans le groupencomprenant les sels solubles des métaux de transition desncolonnes IV à XII de la classification périodique, denpréférence les sels solubles des ions Fe III, Fe II , Zn II etnCu II , et que une étape d'O-alkylation du phénol 3,4-disubstituéndinitré obtenu à l'étape précédente, est effectuée à l'aidend'un agent alkylant. Process for the preparation of 3,4-disubstituted dinitroanilines of formula in which R 1 and R 2, which are identical or different from each other, represent a hydrogen atom, a straight alkyl or branched saturated C 1 -C 6 linear or branched alkylene radical C 2 C 6 , a cyclopropyl radical or a chloroethyl radical, R 3 and R 4 , which may be the same or different from each other, are chosen from the group comprising the chlorine atom, the amino group, the lower C 1 -C 3 alkyl radicals and the trifluoromethyl radical , successively comprising a step of dinitration of a 3,4-disubstituted phenol, a step of alkylation of the dinitrated derivative thus obtained and a step of amination of the 2,6-dinitro-3,4-disubstituted alkoxybenzene thus obtained and characterized by the fact that: the step of dinitration of the 3,4-disubstituted phenol corresponding to the 3,4-disubstituted dinitroaniline sought is carried out in a reaction medium comprising a small excess of nitrating agent, a sufficient quantity of protons and a catalyst chosen from the group comprising the soluble salts of the transition metals of columns IV to XII of the periodic table, preferably the soluble salts of the ions Fe III, Fe II , Zn II and Cu II , and that an O-alkylation step of the dinitrated 3,4-disubstituted phenol obtained in the previous step, is carried out using an alkylating agent.
priorityDate 1997-04-07-04:00^^<http://www.w3.org/2001/XMLSchema#date>
type http://data.epo.org/linked-data/def/patent/Publication

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