摘要:
Vancomycin reacts with phosphoric acid to form a vancomycin diphosphate salt form that is highly crystalline when hydrated. An improved process for isolating vancomycin from an aqueous solution comprises formation of vancomycin diphosphate.
摘要:
Syn-7-[(2-amino-4-thiazolyl) (methoxyimino)-acetyl]-amino>-3-methyl-3-cephem-4-carboxylic acid hydrochloride is prepared by mixing the corresponding free base wherein the oxime is in the syn configuration with hydrochloric acid in a solvent, and separating crystals of the salt. The process is useful in purification of the free base.
摘要:
57 7β-Amino-3-(1-pyridiniummethyl)-3-cephem-4-carboxylate dihydrochloride salt is obtained as the crystalline dihydrate directly from the N-deacylation reaction mixture by mixing said reaction mixture with acetonitrile, acetone or isopropyl alcohol, each containing 5% to 10% water.
摘要:
Crystalline cephalexin hydrochloride monohydrate, a useful antibiotic, can be prepared by the hydration of novel crystalline hydrochloride C 1-4 alkanol solvates.
摘要:
Crystalline cephalexin hydrochloride monohydrate, a useful antibiotic, can be prepared by the hydration of novel crystalline hydrochloride C 1-4 alkanol solvates.
摘要:
The diamonium salt of the oxa-ß-lactam antibiotic of the formula wherein the chiral center of the a-carboxy-p-hydroxy-phenylacetyl side chain has the D-configuration in crystalline form substantially free of the L-diammonium salt. This invention also relates to a process for preparing the crystalline D-diammonium salt of the above formula.