Preparation of 3-formyl-5,6-dihydro-2H-pyran
AssigneeBASF SE
InventorsHeinz Eckhardt, Klaus Halbritter, Norbert Goetz, Gerd Heilen
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Abstract
3-Formyl-5,6-dihydro-2H-pyran is prepared by conversion of acrolein in the presence of water, acids and halohydrocarbons of 1 to 6 carbon atoms and 1 to 6 halogen atoms as solvents at from 60.degree. to 150.degree. C. The 3-formyl-5,6-dihydro-2H-pyran obtained by the novel process is a valuable starting material for the preparation of dyes and crop protection agents.
Claims9
A process for the preparation of 3-formyl-5,6-dihydro-2H-pyran of the formula ##STR3## by conversion of acrolein in the presence of water, acids and organic solvents at an elevated temperature, wherein the reaction is carried out in the presence of halohydrocarbons of 1 to 6 carbon atoms and 1 to 6 halogen atoms as solvents, at between 60.degree. and 150.degree. C.
Dependencies are inferred from the claim text.