US 4,054,579 AGranted

Intermediates in the process for the preparation of 2-(5H-dibenzo[a,d]cyclohepten-5-on-2-yl)acetic, propionic and butyric acids

AssigneeSyntex (U.S.A.) Inc.

InventorsPeter H. Nelson, Karl G. Untch, James P. Dunn

Life of this patent

Estimating the term…

Abstract

2-(5H-dibenzo[a,d]cyclohepten-5-on-2-yl)acetic, propionic and butyric acids, and esters and salts thereof, are prepared by solvolysis of nitrile or amide intermediates, or of ketal-protected nitrile, amide, acid, ester or salt intermediates.

Claims3

Dependent claims

A compound represented by the formula ##STR3## wherein R is hydrogen, methyl or ethyl and Z' is an alkylene ketal having an alkylene group of from 2 to 4 carbon atoms which may be substituted with lower alkyl groups of from 1 to 4 carbon atoms.

Dependencies are inferred from the claim text.

Facts

Application: 05/697,910Filed 21 Jun 1976 · division
Priority: 8 Sep 1975
Granted: 18 Oct 1977
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

C07D 317/72
Having the hetero atoms in positions 1 and 3: spiro-condensed with carbocyclic rings
C07C 51/06
Preparation of carboxylic acids or their salts, halides or anhydrides: from carboxylic acid amides
C07C 51/08
Preparation of carboxylic acids or their salts, halides or anhydrides: from nitriles
C07C 51/373
By reactions not involving formation of carboxyl groups: by introduction of functional groups containing oxygen only in doubly bound form

Family

Serial611,057Parent of this division · filed 8 Sep 1975
US 3,979,430 AParent of this division
US 4,054,579 AThis patent

From the US filing history. Foreign family members aren’t listed.

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