Nitroso derivatives of imidazo [l ,Za]pyridine, imidazo[l,2-a]pyrimidine and imidazo[l ,2-a]pyrazine were obtained in good yields by the action of 2-thienoylhydroxamoyl chloride (2) on 2-aminopyridines, 2-aminopyrimidine and 2-aminopyrazine, respectively. Bemotriazine, benzothiadiazine and quinazoline were obtained from 2 via its reactions with o-phenylendiamine, o-aminothiophenol and methylanthranilate, respectively. 2 was treated with ethylenic and acetylenic dipoloraphiles to afford 3-thienoylisoxazolines and isoxazole, respectively. The structures of the products were assigned and confinned on the basis of their elemental analyses, spectral data and alternative synthesis wherever possible.

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