Carried out a reaction to obtain 2,2,6,6-tetramethylheptane-3,5-dithione from 2,2,6,6-tetramethylheptane-3,5-dione but got different product from the reaction, attached here the reaction condition in question 1 file and the analysis result (MASS and H-NMR) got after isolating the product formed. Can any one help me in solving this.