Preparation of 3,3-dimethyl-pent-4-enoic acid amides
AssigneeBASF SE
InventorKlaus Halbritter
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Abstract
A process for the preparation of 3,3-dimethyl-pent-3-enoic acid amides of the formula I ##STR1## where R.sup.1 and R.sup.2 may be identical or different and each is alkyl of 1 to 4 carbon atoms, or R.sup.1 and R.sup.2 together with the nitrogen on which they are present as substituents form a 5-membered or 6-membered saturated ring which may contain a further hetero-atom, wherein an acetamido-acetal or ketene-acetal-aminal is reacted with 3-methyl-but-2-en-1-ol at from 80.degree. to 220.degree. C., in the presence or absence of an inert organic solvent. The products are valuable intermediates for the preparation of insecticidal cyclopropanecarboxylic acid esters.
Claims4
A process for the preparation of a 3,3-dimethylpent-4-enoic acid amide of the formula I ##STR5## where R.sup.1 and R.sup.2 may be identical or different and each is alkyl of 1 to 4 carbon atoms, or R.sup.1 and R.sup.2 together with the nitrogen on which they are present as substituents form a pyrrolidine, piperidine or morpholine ring,
- wherein an acetamido-acetal of the formula II ##STR6## where R.sup.3 and R.sup.4 may be identical or different and each is alkyl of 1 to 4 carbon atoms, or R.sup.3 and R.sup.4 together are unbranched or branched alkylene of 2 or 3 carbon atoms, and R.sup.1 and R.sup.2 have the above meanings,
- or a ketene-acetal-aminal of the formula III ##STR7## where R.sup.3 is alkyl of 1 to 4 carbon atoms and R.sup.1 and R.sup.2 have the above meanings,
- is reacted with 3-methyl-but-2-en-1-ol at from 80.degree. to 200.degree. C.
Dependencies are inferred from the claim text.