Method for the production of 2,4,6-triketohexahydrotriazines
AssigneeChemische Werke Huls Aktiengesellschaft
InventorsJosef Disteldorf, Werner Hubel, Elmar Wolf
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Abstract
A method of preparing 2,4,6-triketohexahydrotriazines which comprises catalytically trimerizing an organic isocyanate at 60.degree.-150.degree. C. in an inert, polar solvent present in an amount of 5-40 weight % with respect to the quantity of said isocyanate, in the presence of 0.1-5 weight % of a catalyst of the formula ##STR1## or hydrated derivatives of said catalyst, wherein R is selected from the group consisting of hydrogen and C.sub.1 -C.sub.4 alkyl, and Me.sup.+2 is a bivalent metal cation; interrupting the trimerization at a conversion of about 50% by cooling; and then isolating the 2,4,6-triketohexahydrotriazine.
Claims6
A method of preparing 2, 4, 6-triketohexahydrotriazines which comprises:
- catalytically trimerizing an organic isocyanate at 60.degree.-150.degree. C. in an inert, polar solvent present in an amount of 5-40% by weight with respect to the quantity of said isocyanate, in the presence of 0.1-5 weight % of a catalyst of the formula:
- ##STR4## or hydrated derivatives of said catalyst, wherein R is selected from the group consisting of hydrogen and C.sub.1 -C.sub.4 alkyl, and Me.sup.2+ is a bivalent metal cation;
- interrupting the trimerization at a conversion of about 50%, by cooling said trimerization, and then
- isolating said 2, 4, 6-triketohexahydrotriazine.
Dependencies are inferred from the claim text.