Process for the preparation of glyoxal monoactals
US4835320A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1987 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Jun 1, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C47/277
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This process for the preparation of products of general formula (I): ##STR1## wherein either R.sub.1 and R.sub.2, which are identical, represent a --CHRR.sub.3 group, in which R and R.sub.3, which are identical or different, represent an alkyl, alkenyl or aralkyl group, or R.sub.1 and R.sub.2, which are identical, represent a --CH.sub.2 R group, in which R represents a hydrogen atom, an alkyl, alkenyl or aralkyl radical, or R.sub.1 and R.sub.2 together form a --CH.sub.2 --(CRR).sub.n --CHR-- radical, in which n represents 0 or 1 and R retains the meaning given previously, is characterized by reacting glyoxal in the presence of an acid catalyst with an excess of the corresponding alcohol of general formula (II) RR.sub.3 CHOH, (III) RCH.sub.2 OH or (IV) --(CRR).sub.n --CHROH, in which R, R.sub.3 and n retain the meaning given previously, then stopping the reaction as soon as the concentration of the desired monoacetal of general formula (I) decreases in the reaction medium in favor of bisacetal. Application to the preparation of the novel product: 2,2-diallyloxy ethanal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.