We are interested in the synthesis of dihalo alkenes because it is usefulness for converting into active intermediates by using thiophosgene and its halo versions (CSBr2 or CSI2). To test this, we treated various substrates Frist when thiophosgene was treated with 1a disubstituted diazo , we obtained dichloro alkene 2a as major product along with impurities, and its beta lactam amide bond cleaved product 3a as minor product. The 3a is obtained due the C5=N bond formation followed by amide bond cleavage. The aldehyde peak in NMR Is consistent with predicted values. in FT-IR shows Isothiocyanate peak at 2060 cm -1 , which can be formed by :S-C=N enolization The mass m/s shows 447. elimination of HCl gives 2c. In reported method, 1,3,4-thaizdiazole-2-carboxylate were isolated as single by using thiolate . or by using thiophosgene gives mixture or products, ethyl 5-chloro-1,3,4-thiadiazole-2-carboxylate 2c along with ethyl 5-chloro-1,3,4-thiadiazole-2-carboxylate 3d.