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US 4,059,611 AGranted
Oxidative process for the preparation of 2-(5H-dibenzo[a,d]cyclohepten-5-on-2-yl)acetic, propionic and butyric acid
AssigneeSyntex (U.S.A.) Inc.
InventorsPeter H. Nelson, Karl G. Untch
Life of this patent
Estimating the term…
Abstract
2-(5H-Dibenzo[a,d]cyclohepten-5-on-2-yl) acetic, propionic and butyric acid, and esters and salts thereof, are prepared by oxidation of non-ketonic intermediates.
Claims3
A compound represented by the formula ##STR3## wherein R is hydrogen, methyl or ethyl and Y is hydroxy or a sulfonate moiety selected from the group consisting of methanesulfonyloxy, benzenesulfonyloxy, p-toluenesulfonyloxy, p-bromobenzenesulfonyloxy, p-nitrobenzenesulfonyloxy and naphthylsulfonyloxy;
- the esters thereof formed from straight or branched chain alkanols having from 1 to 20 carbon atoms or from benzyl alcohol;
- and the salts thereof selected from the group consisting of sodium, potassium, lithium, calcium, magnesium, ammonium, copper, ethanolamine, diethylamine, tris(hydroxymethyl)aminomethane, choline, caffeine and lysine salts.
Dependencies are inferred from the claim text.