layer chromatographic investigation the elemental analysis was as follows in weight percent ______________________________________ c h n s______________________________________found 50 90 7 10 19 82 22 17calculated as c sub 6 h sub 10 n sub 2 s 50 66 7 08 19 69 22 54______________________________________ the procedure was the same as in example 1 but there was led into the reaction mixture with cooling to 5 u00b0 to 10 u00b0 c hydrogen chloride until the 2 2 dimethyl thiazolidin 4 carbonitrile formed separated as the hydrochloride this was a colorless crystalline substance having a melting point of 125 u00b0 to 128 u00b0 c the yield was 170 grams corresponding to 95 based on the 2 2 dimethyl thiazoline 3 added the 2 2 dimethyl thiazolidin 4 carbonitrile hydrochloride proved to be homogeneous in thin layer chromatographic investigation the elemental analysis was ______________________________________ c h n s cl______________________________________found 40 52 6 30 15 52 17 80 19 79calculated as c sub 6 h sub 11 n sub 2 scl 40 33 6 20 15 67 17 94 19 84______________________________________ the 2 2 dimethyl thiazolidin 4 carbonitrile was produced by the process of example 1 143 grams 1 mole were dissolved in 500 ml of ethanol this solution was treated with 118 grams 1 2 moles of concentrated sulfuric acid with cooling the sulfuric acid salt of 2 2 dimethyl thiazolidin 4 carbonitrile separated out of the mixture as a colorless crystalline substance the yield was 220 grams corresponding to 91 based on the 2 2 dimethyl thiazolidin 4 carbonitrile added the salt recovered sintered at about 140 u00b0 c and decomposed.