4-Oxazolin-2-one → Isobutyraldehyde

Beteiligte Stoffe

Reaktionsschritte

216.7 g of Methoxypropyl acetate and 116.1 g of a polyisocyanate containing isocyanurate groups and based on hexamethylene diisocyanate, consisting mainly of N,N',N"-tris-(6-isocyanatohexyl)-isocyanurate, are introduced under a nitrogen atmosphere into a reaction vessel equipped with stirrer and cooling and heating means. A mixture of 29.9 g of hexahydropyrimidine B8 and 70.7 g of an oxazolone which has been obtained by the reaction of one equivalent of diethanolamine with one equivalent of isobutyraldehyde with elimination of water is then added dropwise at 50° C., the temperature rising to 70° C. Stirring is then continued for 10 hours. An approximately 50% solution of the cross-linking agent B13 containing the hexahydropyrimidine groups and oxazolane groups in a ratio of 1:2 is obtained.

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