acetate 90 10 and purified on a flash silica column using hexane ethyl acetate 90 10 as the eluant to yield benzyl isothiocyanate as a yellow oil a solution of benzyl isothiocyanate 5 g 33 6 mmole in ethanol 50 ml was cooled and stirred at 0 u00b0 c during the addition of hydrazine hydrate 1 7 g 33 6 mmole the resulting white precipitate was collected by filtration to yield 3 3 g 56 of n benzyl thiosemicarbazone m p 124 u00b0 125 u00b0 c formic acid 6 ml was heated on a steam bath 15 min and n benzyl thiosemicarbazone 2 2 g 14 8 mmole was added the mixture was heated for an additional hour then cooled and diluted with water 15 ml the precipitate was collected by filtration and added to 10 aqueous sodium hydroxide 10 ml the resulting mixture was heated on a steam bath for one hour then cooled and acidified with 3n aqueous hydrochloric acid the product was collected by filtration and recrystallized from ethanol to yield 0 8 g 26 of 4 benzyl 1 2 4 triazole 3 thiol m p 124 u00b0 125 u00b0 c a solution of 3 fluorobenzylamine 6 3 g 0 05 mole and triethylamine 15 4 ml 0 11 mole in 50.