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Polyetherols containing thermostable purine rings are obtained in reactions of hydroxymethyl derivatives of uric acid with an excess of ethylene oxide or propylene oxide. By using elementary analytical tools and 1 H-NMR spectroscopy, it was possible to follow the course of reaction at various molar ratios of reagents. A migration of formaldehyde molecules from N-hydroxymethyl groups or from oligooxymethylene bridges to the end of oxyalkyl chains was observed. At the same time, the O-hydroxymethyl groups are successively blocked by oxiranes. The most probable structure of polyetherols is proposed.

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The kinetics and mechanisms of the initial steps of formation of polyetherols from hydroxymethyl derivatives of uric acid and oxiranes were studied. It has been found that initial steps of the reaction of polyetherol formation occur without a catalyst. The NH groups, which are formed upon release of formaldehyde from N-and O-hydroxymethyl derivatives of uric acid, take part in the reaction. C 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: [464][465][466][467][468][469][470][471] 2005