[CH3:1][N:2]1[C:6]([S:7][CH2:8][CH2:9][CH2:10]Cl)=[N:5][N:4]=[N:3]1.[C:12]1([SH:18])[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.C(=O)([O-])[O-].[K+].[K+]>CC(C)=O.[I-].[K+]>[CH3:1][N:2]1[C:6]([S:7][CH2:8][CH2:9][CH2:10][S:18][C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)=[N:5][N:4]=[N:3]11-Methyl-5-(3-chloropropyl)thio-1,2,3,4-tetrazole (1.9 g) and thiophenol (1.1 g) are dissolved in acetone (50 ml). To the mixture are added potassium carbonate (1.5 g) and potassium iodide (0.1 g), and the mixture is refluxed for 3 hours. After acetone is distilled off, water is added to the residue, and the mixture is extracted with ether. The ether solution is washed with diluted aqueous sodium hydroxide and saturated aqueous sodium chloride and dried over sodium sulfate. After ether is distilled off, the residue is purified by silica gel column chromatography (Kieselgel 60), followed by eluting with benzene-chloroform (3:2) to give 1-methyl-5-(3-phenylthiopropyl)thio-1,2,3,4-tetrazole (2.5 g) as colorless liquid, nD18 =1.6008.
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