Water → 1-t-Butylazo-1-isothiocyanatocyclohexane

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To a stirred solution of 91.5 grams (1.05 moles) of sodium thiocyanate in 450 ml of 75% aqueous isopropanol in a 2 liter jacketed reactor, cooled to 5° C., was added 203.2 grams (1.0 moles) of 1-t-butylazo-1-chlorocyclohexane holding the reaction temperature at 10°-20° C. After the addition was complete, the reaction mixture was stirred an additional 90 minutes at room temperature, 900 ml of water added and the reaction stirred until the sodium chloride dissolved. The product was extracted with 300 ml pentane, the pentane extract washed successively with water, 10% NaHCO3 solution, water, dried over anhydrous sodium sulfate, filtered and the pentane evaporated under reduced pressure to leave 173 grams (75% crude yield) of a yellow liquid. The product had a broad band at approximately 2040 cm-1 in its infrared spectrum which is indicative of the isothiocyano band in these compounds. There was no band at 2170 cm-1 (thiocyano band).

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