2,6-Dichlorophenol → 3,5-Dichloro-4-hydroxyphenyl thiocyanate

Participants

Reaction Conditions

Reaction Steps

2,6-Dichlorophenol (100 g, 0.613 mole) and ammonium thiocyanate (102.73 g, 1.350 mole) were mixed in methanol and the solution cooled to 0° C. Chlorine gas was bubbled through the reaction, maintaining the temperature below 10° C. The solution turned a pale yellow color. The reaction was stirred for a total of 3 hours until acidic, at which time ammonia gas was bubbled through and the solution stirred for an additional three hours at 0° to 10° C. The reaction was poured into iced distilled water, and filtered, yielding approximately 20 g of a yellow solid which was dried overnight in vacuo. The filtrate was extracted with ethyl acetate, dried over magnesium sulfate and stripped to yield approximately 100 g of crude product. Following purification by chromatography, the material was taken up to 1 liter of toluene, charcoal added, filtered and recrystallized from hexane to yield 55.03 g of prioduct as a yellow solid. The structure was confirmed by NMR.

Provenance & Evidence