Fluorosulfuric acid → 3-bromo-7-fluorosulfonyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one

HRID 2071733Notes

Reaction equation

HRID 2071733 reaction equation
[F:1][S:2]([OH:5])(=O)=[O:3].[Br:6][C:7]1[CH:8]=[CH:9][C:10]2[CH2:16][CH2:15][C:14]3[CH:17]=[CH:18][CH:19]=[CH:20][C:13]=3[C:12](=[O:21])[C:11]=2[CH:22]=1>>[Br:6][C:7]1[CH:8]=[CH:9][C:10]2[CH2:16][CH2:15][C:14]3[CH:17]=[CH:18][C:19]([S:2]([F:1])(=[O:5])=[O:3])=[CH:20][C:13]=3[C:12](=[O:21])[C:11]=2[CH:22]=1

Participants

3

Reactant 2

HCID 24603Fluorosulfuric acidHCID 129093912-Bromo-5,6-dihydrodibenzo[3,1-[7]annulen-11-one

Product 1

HCID 214121113-bromo-7-fluorosulfonyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one

Procedure

Fluorosulfonic acid, 100 ml., is placed in a 300 ml. 3-necked round bottom flask equipped with polyethylene inlet tube and polyethylene exit tube with drying tube half-filled with anhydrous sodium fluoride. A nitrogen atmosphere is maintained throughout the reaction. With stirring, 17.0 g. (0.059 mole) of 3-bromo-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one is added in portions over 20 minutes. After stirring another 10 minutes, the dark green solution is heated on the steam-bath for 61/2 hours. The mixture then is cooled to room temperature, poured cautiously with stirring into 1.5 kg. of crushed ice, and allowed to stand overnight at room temperature. The brown solid is collected, washed with water, dried in a vacuum desiccator over sodium hydroxide, and then extracted in a Sohxlet extractor with 700 ml. of boiling cyclohexane for 16 hours. On cooling, the cyclohexane extract deposits 11.65 g. (53%) of 3-bromo-7-fluorosulfonyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one as dark yellow flakes, m.p. 148°-151° C. Recrystallizations from ether and cyclohexane gives an analytical sample, m.p. 150°-152° C.

Workup

  1. custom3-necked round bottom flask equipped with polyethylene inlet tube and polyethylene exit tube
  2. customwith drying tube
  3. additionhalf-filled with anhydrous sodium fluoride
  4. temperatureA nitrogen atmosphere is maintained throughout the reaction
  5. stirringAfter stirring another 10 minutes
  6. temperaturethe dark green solution is heated on the steam-bath for 61/2 hours
  7. additionpoured cautiously
  8. stirringwith stirring into 1.5 kg
  9. customThe brown solid is collected
  10. washwashed with water
  11. dry with materialdried in a vacuum desiccator over sodium hydroxide
  12. extractionextracted in a Sohxlet extractor with 700 ml
  13. waitof boiling cyclohexane for 16 hours
  14. temperatureOn cooling
  15. extractionthe cyclohexane extract deposits 11.65 g
  16. customRecrystallizations from ether and cyclohexane
  17. customgives an analytical sample, m.p. 150°-152° C.

Sources & evidence

ORD record
ord-ad7d88fc21a0401882c4d1947370a9d7
Source dataset
uspto-grants-1977_09
Patent number
US04048223

Reaction notes

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