Azinoiminophosphorane mediated 4H,8H-1,2,4-triazolo[1,5-C]-[1,3]oxazepin-4-ones and 5,6-dihydro-7H, 12H-naphtho[2,1-f]-[1,2,4]triazolo[1,5-c][1,3]oxazepin-7-ones synthesis

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