Bromo version, CSBr2 were prepared by treating thiophosgene with lithium bromide in ethyl acetate at 70 o C. FTIR shows slight change in frequency. This CSBr2 is not much explored in organic synthesis . When CSBr2 was treated with diazo 1a, instead of olefin halo derivatives, it gives dibromo product 4a exclusively. Mass M/z shows 532, which is consistent with molecular formula 525 and on combination with Lithium ion. The carbon peaks of dibromo bearing carbon in NMR data (58ppm) is matching with predicted value.