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http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D501-00
filingDate 1994-04-20-04:00^^<http://www.w3.org/2001/XMLSchema#date>
grantDate 1996-03-12-04:00^^<http://www.w3.org/2001/XMLSchema#date>
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publicationDate 1996-03-12-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber US-5498787-A
titleOfInvention Method for preparing cephalosporin derivatives
abstract A method for preparing cephalosporm derivatives by reacting cephalosporin alkaline metal salts with organic halide in the presence of quaternary ammonium salts catalyst is disclosed. Δ 3 →Δ 2 isomerization, a side reaction commonly reported in preparation of cephalosporin derivatives was successfully eliminated. The desired Δ 3 was obtained as a sole product in the reaction.
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