[CH2:1](Cl)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[SH:9][C:10]1[S:11][C:12]2[CH:18]=[CH:17][CH:16]=[CH:15][C:13]=2[N:14]=1.[OH-].[Na+]>C(O)C.O>[CH2:1]([S:9][C:10]1[S:11][C:12]2[CH:18]=[CH:17][CH:16]=[CH:15][C:13]=2[N:14]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1A solution of 28.1 g (0.2 mol) of benzyl chloride in 50 ml of ethanol is added slowly, with stirring, to a solution of 33.4 g (0.2 mol) of 2-mercaptobenzothiazole and 8 g (0.2 mol) of NaOH in 150 ml of ethanol and 25 ml of water. The resulting solution is refluxed for 2.5 h. After cooling, it is filtered and evaporated to leave 35.1 g of a yellowish solid melting at 39°-40° C. 1H NMR (CDCl3): δ4.41 (2H), δ6.98-7.8 (9H) ppm.
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