Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5030/60A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pfizer Inc
Original Assignee
Pfizer Inc
Charles Pfizer and Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pfizer Inc, Charles Pfizer and Co IncfiledCriticalPfizer Inc
Publication of GB880331ApublicationCriticalpatent/GB880331A/en
Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
6-demethyl-6-deoxytetracycline is recovered in the form of its acid sulphate addition salt from a lower alkanol or lower alkoxy alkanol solvent by contacting the amphoteric 6-demethyl-6-deoxy-tetracycline or an acid addition product thereof in the alcoholic solvent medium with at least an equimolar amount of concentrated sulphuric acid to form the corresponding acid sulphate addition salt, crystallizing this salt from the solution, and separating the crystalline salt. The solvent may be methanol, ethanol, isopropanol, n-butanol, b -methoxyethanol, b -ethoxyethanol or b -(b -methoxy)-ethoxyethanol.
GB5030/60A1959-09-301960-02-12Process of obtaining antimicrobial agents
ExpiredGB880331A
(en)