Thio(cyclo) alkanepolycarboxylic acids containing heterocyclic substituents

U.S. Patent Number: 5347008

Abstract: Compounds of the formula ##STR1## in which X is --S--, --O-- or --NH--, R is H or a monovalent substituent, n is 0 or 1 and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are H, alkyl, alkyl which is substituted by OH, halogen, COOH or alkoxy, unsubstituted or substituted aryl or aralkyl, or carboxyl, or R.sup.1 and R.sup.2 or R.sup.1 and R.sup.3 together are alkylene or R.sup.1 and R.sup.2 are a direct bond, at least two of the groups R.sup.1, R.sup.2, R.sup.3 and R.sup.4 being carboxyl or carboxyalkyl groups, and base addition salts thereof are effective corrosion inhibitors. The preparation of these novel polycarboxylic acids can be effected by various processes.

Inventors: Bentley; Robert L. (Urmston, GB), Savage; Michael P. (Heald Green, GB), Shelton; Kenneth W. (Brooklands, GB)

Assignee: Ciba-Geigy Corporation (Ardsley, NY)

Application Number: 07/975,153

Issued: 1994-09-13

Expired: 2006-09-13

Classes: 548/170

Field of search: 548/170

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