Crown calix[4]arenes, method of preparation and use for selective extraction of caesium
US6156282A · kind A · utility
4Cited by
2References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1999 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Jan 27, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D323/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to new calixarenes of formula: ##STR1## in which R.sup.1 represents a crown ether chain that includes at least two aryl or cycloalkyl rings, PA1 R.sup.2 is a hydroxyl or alkoxy group, or the two R.sup.2 groups together form a crown ether chain such as R.sup.1, and R.sup.3 represents a hydrogen atom or an alkyl group. The calixarenes are used to selectively extract caesium from aqueous solutions that notably have high concentrations of sodium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.