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- Other solvents such as tetrahydrofuran, ethanol, methanol, dimethyl sulfoxide, and N,N-dimethylformarnide are also effective for this Conversion.
- Imines derived from pyridinecarboxaldehyde, thiophenecarboxaldehyde and furancarboxaldehyde also undergo the transformation to produce the corresponding xanthines.
- Blicke , F. F. and Godt , H. C. Jr. 1954 . J. Am. Chem. Soc. , 76 : 2798 Papesch, V. and Schroeder, E. F., J. Org. Chem., 1951, 16, 1879.