Process for preparing alkylpyrylium salts
US4221722A · kind A · utility
1Cited by
3References
19Claims
0Family size
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Key dates
| Filing date | Nov 14, 1978 |
| Grant date | Sep 9, 1980 |
| Priority date | — |
| Expiry date | Nov 14, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D309/34
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing polyalkylpyrylium salts comprising a polyalkylpyrylium cation, wherein the pyrylium nucleus is substituted by 3 to 5 alkyl substituents three of which are situated in the 2-, 4- and 6-position is disclosed which comprises the step of reacting a branched alkane comprising at least one tertiary carbon atom with an acylating agent which is a reactive alkylcarboxylic acid derivative and an alkyl halide in the presence of a Lewis acid catalyst selected from the group consisting of aluminum halides, ferric halides and mixtures thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.