Water → 2-Chloro-6-nitro-benzenethiol

Twenty grams of 2,3-dichloronitrobenzene was dissolved in 200 ml of absolute ethanol and the resulting solution added dropwise over three hours to a mixture of 40.0 g of sodium sulfide hydrate in 225 ml of absolute ethanol. The reaction temperature did not exceed 30° C. during the addition. The reaction was allowed to stir for 48 hours at room temperature. Since some of the 2,3-dichloronitrobenzene was still present, as indicated by GLC, an additional 9.0 g of the sodium sulfide hydrate was added at once and the reaction was allowed to stir overnight at room temperature. The ethanol was removed and the concentrate was partitioned between 300 ml of water and 250 ml of ether, the ether extract was discarded, and the aqueous phase made acidic by the dropwise addition of 50 ml of concentrated hydrochloric acid with the evolved gas being scrubbed through a bleach trap. A large amount of solid formed. Water, 100 ml, was added and the aqueous phase extracted with 350 ml of methylene chloride. The organic phase was dried with magnesium sulfate, filtered and concentrated to yield 11.8 g of a tan solid.

1. additionThe reaction temperature did not exceed 30° C. during the addition
2. stirringto stir overnight at room temperature
3. customThe ethanol was removed
4. customthe concentrate was partitioned between 300 ml of water and 250 ml of ether
5. extractionthe ether extract
6. additionthe aqueous phase made acidic by the dropwise addition of 50 ml of concentrated hydrochloric acid with the evolved gas
7. custombeing scrubbed through a bleach trap
8. customA large amount of solid formed
9. extractionthe aqueous phase extracted with 350 ml of methylene chloride
10. dry with materialThe organic phase was dried with magnesium sulfate
11. filtrationfiltered
12. concentrationconcentrated

ORDレコード

ord-6685d4b90f974de1999fb299d14342f8

出典データセット

uspto-grants-1993_12

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US05272128