| 摘要 |
A method of preparing 2,4,6-triketohexahydrotriazines which comprises catalytically trimerizing an organic isocyanate at 60 DEG -150 DEG 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 <IMAGE> or hydrated derivatives of said catalyst, wherein R is selected from the group consisting of hydrogen and C1-C4 alkyl, and Me+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.
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