Process for obtaining 3,7-dialkylxanthines from 3-alkyl-xanthines
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United States of America Patent
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Dec 12, 1995
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Nov 9, 1993
filing date -
Nov 10, 1992
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Abstract
Process for obtaining 3,7-dialkylxanthines from 3-alkyl-xanthines 3,7-Dialkylxanthines are obtained from the corresponding 3-alkylxanthines using an alkylating agent in the presence of quaternary ammonium and/or phosphonium compounds and, where appropriate, of additional polyethers in a two-phase mixture.
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