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US 4,288,614 AGranted
Process for the preparation of esters of 5-formyl-3-methyl-2,4-pentadien-1-ol
AssigneeHoffmann-La Roche Inc.
InventorGary L. Olson
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Abstract
A novel process for the preparation of esters of 5-formyl-3-methyl-2,4-pentadien-1-ol which employs as starting materials 2-substituted-3-methyl-6-alkoxy-3,6-dihydro-2H-pyrans. Novel intermediates are also disclosed.
Claims3
A process for preparing a compound of the formula:
- ##STR18## wherein R.sub.1 is lower alkyl;
- which comprises treating a compound of the formula:
- ##STR19## wherein R.sub.1 is as above and R.sub.2 is lower alkyl, with a catalytic amount of an amine hydrohalide at a temperature of from about 80.degree. C. to about 200.degree. C., said treatment being conducted in a polar aprotic solvent.
Dependencies are inferred from the claim text.