Method for preparing azines and hydrazones
US3972878A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1975 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Feb 7, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C249/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Ammonia and aldehydes or ketones are selectively oxidized by hydrogen peroxide to the corresponding azines when they are reacted in the presence of both (a) an amide of a carboxylic acid having a pK greater than about 4.3 and (b) a co-catalyst having the general formula H--X--Y=Z, wherein H is hydrogen, X and Z are each an atom of oxygen or nitrogen and Y is an atom of carbon, nitrogen, arsenic, antimony, phosphorus, sulfur, selenium or tellurium; the atoms of X, Y, and Z carrying other substituents necessary to obey the rules of valence. Preferred co-catalysts include di(alkali metal) hydrogen phosphates, lower dialkyl phosphate esters, bicarbonates and p-toluene sulfonic acid. When 1.degree. or 2.degree. amines are also present, hydrazones are also formed along with the azines. Uses of the resultant products include their hydrolysis to hydrazines with recycling of aldehyde or ketone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.