One-step process for the preparation of halide-free hydrophobic salts
US7253289B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2002 |
| Grant date | Aug 7, 2007 |
| Priority date | — |
| Expiry date | Jun 12, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/28
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention describes a one pot, single-step process for the preparation of halide-free hydrophobic salts comprising polyalkylated imidazolium cations and various anions in accordance with the following structure, where R1 and R3 represent the either the same or different alkyl groups, and R2, R4, and R5 represent either hydrogen atoms, or the same or different alkyl group substituents; X represents a polyatomic anion that is the conjugate base of an acid. By simply mixing aqueous formaldehyde with an alkyl amine such as methylanune, ethylamine, n-propyl oriso-propylamine, or n-butyl-, iso-butyl, or t-butylamine, or by mixing aqueous formaldehyde with two alkyl amines (preferably one being methylamine, ethylamine, n-propyl- or iso-propylamine, or n-butyl-, isobutyl, or t-butylamine) and another being n-propyl- or isopropylaine, or n-butyl-, isbutyl, or t-butylamine), an acid (such as hexafluorophosphoric acid, trifluoroacetic acid, pentafluoropropionic, heptafluorobutyric acid, or the free acid of a bis(perfluoroalkylsulfonyprnide or tris(perfluoroalkylsulfonyl)methide as the source of the anion) and aqueous glyoxal solution, the hydrophobic ionic salts or mixtures thereof thus …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.