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Sulphanilic acid (12.1 g, 0.07 mole) was partly dissolved in 280 milliliters of aqueous ethanol (50% by volume) at reflux and 4,7-dichloroquinazoline (13.9 g, 0.07 mole) was added rapidly in a few portions. The mixture was refluxed for a further 15 minutes, cooled and filtered to give the title compound hemihydrate of melting point greater than 300° C.

1. temperatureat reflux
2. temperatureThe mixture was refluxed for a further 15 minutes
3. temperaturecooled
4. filtrationfiltered