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US 4,066,652 AGranted
Substituted 8-hydroxyquinolines and process for the preparation thereof
AssigneeAshland Oil, Inc.
InventorJames A. Hartlage
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Abstract
A class of hydrocarbyl substituted 8-hydroxyquinolines wherein the indicated substituent arises through the indirect alkylation of said quinolinol with a hindered aldehyde. These alkylates are useful metal collectors in hydrometallurgical extraction processes designed for the recovery of metal values from dilute aqueous solutions thereof.
Claims4
A process for preparing a compound of the formula:
- ##STR4## wherein R and R' represent alkyl groups having a sum total of 6-18 carbon atoms, which comprises the steps of heating at a temperature of about 140.degree.-200.degree. C. substantially equal molar amounts of 8-hydroxyquinoline and a hindered aldehyde of the formula:
- ##STR5## wherein R and R' have the above-mentioned meanings, to effect the condensation thereof and the concomitant removal of water of dehydration from the condensate and thereupon distilling the reaction product to recover the resultant alkylate.
Dependencies are inferred from the claim text.