“…Large number has been proposed for phenoxathiin and some of its derivatives, recently addition of phenoxathiincation radical to a cyclic alkene in acetonitril (MeCN) solution occurred stereo specifically to form bis(10-phenoxathiiniumyl) alkane adducts [4]. Phenoxathiin derivatives have recently gained attention owing to their fluorescent properties [5].Ionescuand Popovici [6], studied the emission properties of 2-phenoxathiinyl-5-phenyloxazole and 5-phenoxathiinyl-2-phenyloxazole derivatives by measuring the absorption and emission spectra of the derivatives above in cyclohexane and methanol. Aly and Wasfy [7], describedthat [6-(phenoxathiin-2-yl) -2,3,4,5-tetrahydropyridazine-3-one] was successively synthesized by the condensation of [4-(phenoxathiin-2-yl)-4-oxobutanoic acid] with hydrazine hydrate in boiling ethanol.…”