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US 5,274,129 AGranted
Hydroxamic acid crown ethers
AssigneeIdaho Research Foundation, Inc.
InventorsNicholas R. Natale, Chien M. Wai, Sadik Elshani
Life of this patent
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Abstract
Novel derivatives of hydroxamic acid chelating agents for the chelation of f-block elements, yttrium and scandium and methods for the extraction of such elements.
Claims36
A dibenzo crown ether derivative of a hydroxamic acid represented by the formula:
- ##STR7## wherein X is a dibenzo crown ether of the formula dibenzo -[13 + 3m]-crown-[4 + m]-ether, and m is an integer of from 0 to about 5, n is an integer of from 0 to 6 and R is H or a lipophilic hydrocarbyl group having from 1 to about 18 carbon atoms and is selected from the group consisting of alkyl, cycloalkyl, alkenyl and aryl groups.
An acyclic dibenzo ether derivative of a hydroxamic acid represented by the formula:
- ##STR8## wherein Y is a member selected from the group consisting of (CH.sub.2).sub.3, ##STR9## wherein n is an integer of from 1 to about 4, and CH.sub.2 CONHCH.sub.2 CH.sub.2 NHCOCH.sub.2 ;
- and R, which may be the same or different, is selected from the group consisting of H, and a hydrocarbyl group having from 1 to about 18 carbon atoms and selected from the group consisting of alkyl, cycloalkyl, alkenyl and aryl groups.
A bis-dibenzo crown ether derivative of a hydroxamic acid represented by the formula:
- ##STR10## wherein X is a dibenzo crown ether of the formula dibenzo-[13+3m]-crown-[4+m]-ether and m is an integer of from 0 to about 5, and X may be the same or different, and R is hydrogen or a lipophilic hydrocarbyl group having from 1 to about 18 carbon atoms and is selected from the group consisting of alkyl, cycloalkyl, alkenyl and aryl groups.
A hydroxamic acid derivative of the formula:
- ##STR11## wherein R is H or a hydrocarbyl group having from 1 to about 18 carbon atoms and selected from the group consisting of alkyl, cycloalkyl, alkenyl and aryl groups.
Dependencies are inferred from the claim text.