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

Temperature

0 °C

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 the reaction mixture and the solution stirred for an additional three hours 0° to 10° C. The reaction was poured into iced distilled water, and filtered, yielding approximately 20 g of yellow solid which was dried overnight in vacuo. The filtrate was extracted with ethyl ether and the extract dried over magnesium sulfate and solvent removed in vacuo to yield approximately 100 g of crude product. Following purification by silica chromatography, the material was taken up in 1 liter of toluene, charcoal added, filtered and recrystallized from hexane to yield 55.03 g of product as yellow solid, m.p. ca. 94.5°-97° C. The structure was confirmed by NMR.

1. customChlorine gas was bubbled through the reaction
2. temperaturemaintaining the temperature below 10° C
3. customwas bubbled through the reaction mixture
4. stirringthe solution stirred for an additional three hours 0° to 10° C
5. additionThe reaction was poured
6. distillationinto iced distilled water
7. filtrationfiltered

ORD record

ord-9d58c3ea89d9414abd934e6ec8e46202

Source dataset

uspto-grants-1993_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05244899