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    • 6. 发明专利
    • DE1545596A1
    • 1969-08-07
    • DE1545596
    • 1965-06-28
    • BEECHAM GROUP LTD
    • RAYMOND STOVE EDWARDRODNEY THOMAS GORDON
    • C07D499/00C07D499/60
    • Penicillins, particularly effective in the presence of human serum, have the formula where X is hydrogen or chlorine. Salts are formed with alkali and alkaline earth metals, aluminium, ammonium and organic amines. The penicillins are prepared by reacting 6-aminopenicillanic acid or a salt thereof, with an acid of formula wherein X has the above meaning. A functional equivalent of the acid, e.g. acid chloride, or an intermediate formed from the a -methoxy acid and a condensing agent, e.g. dicyclohexyl-carbodiimide may be used. The penicillins are effective antibacterials when administered orally. They may be used as nutritional supplements in animal feed and for the treatment of mastitis in cattle. m-Fluoro-a -methoxyphenyl acetyl chloride is prepared by treating m - fluoro - a - methoxy - phenylacetic acid with thionyl chloride. 4-Chloro-3-fluorotoluene is prepared by treating 4-chloro-m-toluidine with sodium nitrite and fluoroboric acid and decomposing the resultant 2-chloro-5-methyl benzene diazonium fluoroborate by heat. 4 - Chloro - 3 - fluoro - a - methoxyphenylacetic acid is prepared by reacting 4-chloro-3 fluoro-toluene with bromine and conc. H2SO4 to form 4-chloro-3-fluorobenzaldehyde, which is treated with bromoform and KOH in methanol followed by acidification with HCl to form the sodium hydrogen salt, which is dissolved in aqueous KOH and the free acid liberated by the addition of HCl. Reference has been directed by the Comptroller to Specification 880,042.