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6-Methylsulfanyl-4H-pyrimido[1,6-a]pyrimidin-4-one

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Author(s): Quinhua Huang | Paul F. Richardson | Eugene Rui | Arnold L. Rheingold | Alex Yanovsky

Journal: Acta Crystallographica Section E
ISSN 1600-5368

Volume: 65;
Issue: 10;
Start page: o2572;
Date: 2009;
Original page

ABSTRACT
Reaction of 2-(methylsulfanyl)pyrimidin-4-amine with the 5-(methoxyvinylidene) derivative of Meldrum's acid and subsequent heating of the product in Dowtherm fluid yielded the title compound, C8H7N3OS, which was proven to contain a bicyclic 4H-pyrimido[1,6-a]pyrimidine system. All non-H atoms of the molecule are coplanar within 0.15 Å. The bond-length distribution in the bicyclic core shows localization of the double bonds. The geometry of the intramolecular S...O 1,5-contact [2.534 (2) Å] is consistent with the existence of an attractive interaction.
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