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US 3,947,442 AGranted
Method for producing heterocyclic acid anhydrides and pyrimidinediones
AssigneeThe Sherwin-Williams Company
InventorAthelstan L. J. Beckwith
Life of this patent
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Abstract
A method for producing heterocyclic acid anhydrides and pyrimidinediones from the corresponding acids, dicarboxamides, 2,3-and 3,4-pyridinedicarboxamides, and N-monosubstituted 2,3-and 3,4-pyridinedicarboxamides, in which the aforesaid compounds are reacted with lead tetra-acetate in the presence of a suitable anhydrous inert solvent.
Claims5
A method for producing a pyrimidinedione having the formula, ##SPC4##
- wherein each of W, X, Y and Z is N or CH and, not more than two of W, X, Y and Z can be N, and R is hydrogen or an alkyl group having not more than 8 carbon atoms, said method comprising dissolving in an inert anhydrous solvent substantially equivalent amounts of lead tetraacetate and a compound having the formula ##SPC5##
- wherein each of W, X, Y and Z is N or CH and, not more than two of W, X, Y and Z can be N, and one R is hydrogen while the other R has the meaning set forth above, agitating the reaction mixture at a temperature sufficiently high that reaction occurs and recovering the pyrimidinedione.
Dependencies are inferred from the claim text.