Process for the preparation of pyridine and substituted pyridines
US4401819A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1982 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Mar 22, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D213/133
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of pyridine and substituted pyridines, in the vapor phase. These compounds are obtained by heating, at a temperature of 200.degree. to 500.degree. C., in the vapor phase: PA0 piperidine or piperidine substituted by one or more lower alkyl radicals; PA0 1,5-diaminopentane; PA0 1,5-diaminopentane containing, in its hydrocarbon part, from 1 to 3 linear or branched alkyl radicals having from 1 to 4 carbon atoms; or PA0 compounds such as: N,N'-bis-(piperidin-2-yl)hydrazines, in the presence of a catalyst consisting of palladium, platinum or ruthenium deposited on a macroporous solid. The products obtained by the process according to the invention have various uses. Pyridine is used in particular as a solvent. .beta.-Picoline (or 3-methylpyridine) is used for the preparation of nicotinic acid or nicotinamide, used in pharmacy and in nutrition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.