Abstract A series of halogenated phenoxathiins (10a-c),(11a, b), and a 1-azaphenoxathiin (13) have been prepared satisfactorily by the reaction between l-oxaspiro [2.5] octa-5, 7-dien- 4-ones (6-spiroepoxy-2, 4-cyclohexadienones)(9a-c) and the appropriate halogenated