7,14-Diacetyl-6,13-dihalo-3,10-diethoxytriphenodithiazines have been synthesised by reductive acetylation of 6,13-dihalo-3,10-diethoxytriphenodithiazine with Zn dust (Ac 2 O) pyridine. Attempts to synthesis 7,14-dihydro-6,13-dihalo-3,10-diethoxytriphenodithiazine is failed. Oxidation with 30% H 2 O 2 in AcOH of 7,14-diacetyl-6,13-dihalo-3,10-diethoxytriphenodithiazine did not produce its S,S-dioxide. 3-Acetoxy-7-ethoxy-1,2,4-trihalophenothiazine on treatment with 30% H 2 O 2 in AcOH regenerated 7-ethoxy-1,2,4-trihalo-3H-phenothiazine-3-one by oxidative deacetylation. Their R i values and IR spectral data have been recorded.