Process for the preparation of a mixture of aminomethylenated glutaconic acid dinitriles
AssigneeBayer Aktiengesellschaft
InventorHelmut Kraus
Life of this patent
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Abstract
Aminomethylenated glutaconic acid dinitriles of the formula ##STR1## in which R.sup.1 and R.sup.2 independently of one another represent hydrogen, straight-chain or branched C.sub.1 -C.sub.8 -alkyl, C.sub.3 -C.sub.8 -alkenyl, C.sub.2 -C.sub.8 -alkoxyalkyl, C.sub.4 -C.sub.8 -alkoxyalkenyl, C.sub.3 -C.sub.8 -cycloalkyl, C.sub.6 -C.sub.12 -aryl, C.sub.7 -C.sub.10 -aralkyl or a 5- to 8-membered, saturated or unsaturated heterocyclic ring containing 1 or 2 heteroatoms from the group comprising N, O and S, are obtained by reacting 3-amino-acrylonitriles of the formula ##STR2## in which the radicals R.sup.1 and R.sup.2 have the meaning mentioned, with one another at from 0.degree. to 100.degree. C. in the presence of at least 0.5 equivalents of an acidic compound.
Claims7
Process for the preparation of an aminomethylenated glutaconic acid dinitrile of the formula ##STR7## in which R.sup.1 and R.sup.2 independently of one another represent hydrogen, straight-chain of branched C.sub.1 -C.sub.8 -alkyl, C.sub.3 -C.sub.8 -alkenyl, C.sub.3 -C.sub.8 -alkoxy-alkyl, C.sub.4 -C.sub.8 -alkoxyalkenyl, C.sub.3 -C.sub.8 -cycloalkyl, C.sub.6 -C.sub.12 -aryl or C.sub.7 -C.sub.10 -aralkyl,
- characterized in that at least one 3-amino-acrylonitrile of the formula ##STR8## in which R.sup.1 and R.sup.2 have the scope of meaning mentioned, is reacted at from 0.degree. to 100.degree. C. in the presence of at least 0.5 equivalent of an acidic compound per mole of the total quantity of 3-amino-acrylonitrile, the overall yield of I being at least 69.7% when R.sup.1 and R.sup.2 are both methyl.
Dependencies are inferred from the claim text.