Iodine → 2,4-Dimethyl-3-hydroxymethyl-5-iodothiophene

Temperature

-50 °C

10.0 G. (46 mmol) of mercuric oxide and 14.7 g. (58 mmol) of iodine were added alternately over a period of 11/4 hrs. to a vigorously stirred solution of 8.2 g. (57.7 mmol) of 2,4-dimethyl-3-hydroxymethylthiophene in 300 ml. of benzene. The reaction mixture was kept at room temperature by cooling with and ice bath and stirring was continued for an additional hour. The mercuric iodide which precipitated was filtered and washed well with warm ethyl ether. The combined organic solutions were washed with 10% sodium thiosulfate and saturated sodium chloride solution, dried and evaporated. The resulting residue was dissolved in a minimum amount of hot ether, an equal amount of hexane was added and the solution cooled to -50° C. The crystals which precipitated were filtered and washed with cold hexane to yield after drying 2,4-dimethyl-3-hydroxymethyl-5-iodothiophene, m.p. 118.5°-120.5° C.

1. customwas kept at room temperature
2. temperatureby cooling with and ice bath
3. waitwas continued for an additional hour
4. customThe mercuric iodide which precipitated
5. filtrationwas filtered
6. washwashed well with warm ethyl ether
7. washThe combined organic solutions were washed with 10% sodium thiosulfate and saturated sodium chloride solution
8. customdried
9. customevaporated
10. dissolutionThe resulting residue was dissolved in a minimum amount of hot ether
11. additionan equal amount of hexane was added
12. customThe crystals which precipitated
13. filtrationwere filtered
14. washwashed with cold hexane
15. customto yield
16. dry with materialafter drying 2,4-dimethyl-3-hydroxymethyl-5-iodothiophene, m.p. 118.5°-120.5° C.

ORD record

ord-17f3d5af4fba47e0b649eaf0af3fed6e

Source dataset

uspto-grants-1981_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04256878