New different types of 2,3-dihydroimidazole-2-ylidenes (1) have been successfully synthesized and characterized by NMR and X-ray, 1,3-diisopropyl-4, 5-dimethylimidazolium 4-methylbenzenethiolate (2) was very sensitive toward atmosphere, so it enhance the oxidation probability of the methyl thio phenol ion and formed benzenesulfinateImidazolium salt (3). Single crystals of 3 that suitable for X-ray crystal structure analysis were obtained by allowing diethyl ether vapor diffuse into an acetone solution at RT. The compound is crystalline in the monoclinic space group P21/c.