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Department of Chemistry, H. B. Technological Institute, Kanpur Received 15 October 1971, revised MSS received 27 March 1972 Chalcones IX : Syntheses of Some Methoxy Chalcones.

Department of Applied Chemistry, University College of Science and Technology, Calcutta-9 Manuscript received 4 August 1972; accepted 17 February 1973 Synthesis of some 2,6-diamino-9-arylpurines,2,6mino-9-ary1-8-azapurines and 2,4-diamino­6-arylamino-5-phenylazopyrirnidines have been reported. 9-Arylpurines were prepared by the cyclization with formamide of appropriate 6-arylamino-2,4,5-triaminopyrimidine bisulphite. The 9-aryl-8-azapurines were prepared by the cyclization of the above 2,4,5-triasninopyrimidine bisulphites with nitrous acid. The 6-ary/amino-2,4,5-triaminopyrimidine bisulphites were obtained by the reduction of the 2,4-diamino-5-nitroso-6-arylarninopyrimidines with sodium hydrosulphite. The 5-phenylazopyrimidines were synthesized by the reaction of appropriate 2,4-diamino-6-aryl­aminopyrimidines with benzenediazonium chloride. The assignment of structures of these 9- arylpurines and 9-aryl-8-azapurines were based upon their lack of acidic character.

Department of Chemistry, H. B. Technological Institute, Kanpur Received 23 October 1971; revised MSS received 27 March 1972 Chalcones X : Syntheses of Naphthalene Chalcone Analogues.