Process for the preparation of 2,2-dimethylolalkanals
AssigneeBayer Aktiengesellschaft
InventorsOtto Immel, Hans-Helmut Schwarz
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Abstract
An improvement in a process for the preparation of 2,2-dimethylolalkanal of the formula ##STR1## where R denotes an optionally substituted aliphatic radical by reacting 2-alkylacrylaldehyde with formaldehyde in presence of water and a base, the improvement residing in employing an aldehyde of the formula ##STR2## wherein R has the meaning indicated above and a mol ratio of the same to formaldehyde of 1:8-30 at a temperature in the range from -10 to 100.degree. C.
Claims11
A process for the preparation of a 2,2-dimethylolalkanal of the formula ##STR7## wherein R denotes an unsubstituted straight chain or branched alkyl radical with up to 15 carbon atoms or a C.sub.1 to C.sub.4 alkoxy substituted straight or branched alkyl radical with up to 15 carbon atoms,
- which comprises contacting a 2-alkylacrylaldehyde of the formula ##STR8## wherein R has the meaning indicated above, with formaldehyde in the presence of water and a hydroxide or carbonate of an alkali metal or alkaline earth metal, a tertiary amine or a basic ion exchanger employing a molar ratio of 2-alkylacrylaldehyde to formaldehyde of 1:8 to 1:30 and a temperature in the range of -10.degree. C. to 100.degree. C.
Dependencies are inferred from the claim text.