ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Contribution to Methylation of 9-Alkylxanthines

A. Bozoóvá, A. Rybár, J. Alföldi, V. Pätoprstý, M. Kačuráková, and V. Lokaj

Institute of Chemistry, Slovak Academy of Sciences, SK-84238 Bratislava

Abstract: Chromatographic and spectral methods were the tools for investigation of the methylation products of the reaction of 1,8,9-trimethylxanthine with methyl iodide in dimethylformamide in the presence of potassium carbonate. In addition to the expected 1,3,8,9-tetramethylxanthine also products of consecutive reactions - 1,3,7,8-tetramethylxanthine, 1,7,8,9-tetramethylxanthinium betaine, 1,7,8,9-tetramethylxanthinium iodide, 1,3,7,8,9-pentamethylxanthinium iodide and little amounts of 2-methoxy-1,8,9-trimethylhypoxanthine and 8-ethyl-1,3,7-trimethylxanthine - were separated and identified.

Full paper in Portable Document Format: 475a320.pdf

Chemical Papers 47 (5) 320–324 (1993)