No abstract

Key indicatorsSingle-crystal X-ray study T = 173 K Mean '(C±C) = 0.004 A Ê R factor = 0.054 wR factor = 0.140 Data-to-parameter ratio = 11.9For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e. # 2004 International Union of Crystallography Printed in Great Britain ± all rights reserved The title compound, C 12 H 8 N 4 O, is of pharmacological interest. It contains an imidazo[1,2-a]pyrimidine heterocycle, carrying a nitroso group in position 3 and a phenyl group in position 2. Both substituents are almost coplanar with the heterocycle.

Key indicatorsSingle-crystal X-ray study T = 173 K Mean '(C±C) = 0.003 A Ê R factor = 0.045 wR factor = 0.128 Data-to-parameter ratio = 15.4For details of how these key indicators were automatically derived from the article, see ÁClO 4 À , contains an imidazo[1,2a]pyrimidinium moiety carrying a hydroxyimine group, a methoxy group and a phenyl ring. The charge is balanced by a perchlorate anion. The 2-hydroximinoimidazo[1,2-a]pyrimidinium moiety is essentially planar and the hydroxyimine group is cis to the N atom of the heterocycle.