Abstract: 2-methyl-2-phenyl-1,3-dithiocycloheptane were prepared through the benzenemethylal with Buntes’ Salts prepared from 1,4-dichlorobutane and sodium thiosulfate. The yield of 2-methyl-2-phenyl-1,3-dithio- cycloheptane is 60%. The optimum molar ratio of 1,4-dichlorobutane and sodium thiosulfate was 1:1.The structure of 2-methyl-2-phenyl-1,3- dithiocycloheptane were characterized by IR, 1HNMR, MS. The odour of 2-methyl-2-phenyl-1,3-dithiocycloheptane was identified, and the result showed that it′s odour is intense onion and garlic fragrance. The threshold of 2-methyl-2-phenyl-1, 3-dithiocycloheptane is (0.24～0.35)×10-6 in water and (15.00～23.40)×10-6 in vegetable oil.

Key words: Bunte Salts, synthesis, 2-methyl-2-phenyl-1,3-dithiocycloheptane, odour