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classificationIPCInventive http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B61-00
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filingDate 2002-08-15-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7ec99168e242dd477129f50bf187e3ad
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_99c13dc12d925e9da3c74a05d4737b0b
publicationDate 2003-03-06-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber US-2003045735-A1
titleOfInvention Preparation of 1-amino-4-hydroxyanthraquinones
abstract The present invention relates to a process for preparing 1-amino-4-hydroxyanthraquinones of the formula (I) n n n wherein R is an aliphatic or aromatic radical, n by reacting 1,4-dihydroxyanthraquinone, optionally as a mixture with 2,3-dihydro-1,4-dihydroxyanthraquinone, with aliphatic or aromatic amines in the presence of N-methyl-2-pyrrolidone.
priorityDate 2001-08-16-04:00^^<http://www.w3.org/2001/XMLSchema#date>
type http://data.epo.org/linked-data/def/patent/Publication

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