1,2,3,4-Tetramethylbenzene → (Bromomethyl)(phenyl)(2,3,4,5-tetramethylphenyl)sulfonium tetrafluoroborate
Reaction equation
[C:1]1([S:7]([CH2:9][Br:10])=O)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH3:11][C:12]1[CH:17]=[CH:16][C:15]([CH3:18])=[C:14]([CH3:19])[C:13]=1[CH3:20].FC(F)(F)S(OS(C(F)(F)F)(=O)=O)(=O)=O.[H+].[B-:37]([F:41])([F:40])([F:39])[F:38]>C(OCC)C>[F:38][B-:37]([F:41])([F:40])[F:39].[Br:10][CH2:9][S+:7]([C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1)[C:17]1[CH:16]=[C:15]([CH3:18])[C:14]([CH3:19])=[C:13]([CH3:20])[C:12]=1[CH3:11]Participants
Reactant 4
Product 1
Reagents, catalysts & solvents 1
Procedure
Bromomethyl phenyl sulfoxide (1 g, 4.58 mmol) of example 32 was dissolved in dry diethyl ether (30 mL) under an argon atmosphere. 1,2,3,4-tetramethylbenzene (0.678 g, 1.09 eq) was added to the previous solution and then the mixture was cooled to a temperature below −60° C. After stabilizing the temperature, trifluoromethanesulfonic anhydride (0.77 mL, 1 eq) was added slowly, maintaining the same temperature. The mixture was stirred until the reaction was complete. After 3 hours at −60° C., HBF4 in diethyl ether was added (54%, 1.11 mL, 1.75 eq). The resulting suspension was stirred for 30 minutes. The precipitated tetrafluoroborate salt formed was isolated by filtration and dried under vacuum. 1.24 g (62%) of the desired product was obtained as a white solid. mp: 140-142° C.
Workup
- temperaturethe mixture was cooled to a temperature below −60° C
- additionwas added slowly
- temperaturemaintaining the same temperature
- stirringThe resulting suspension was stirred for 30 minutes
Sources & evidence
- ORD record
- ord-1c5cd80b9d1f448f93b8dc0deecddd0f
- Source dataset
- uspto-grants-2016_06
- Patent number
- US09359294B2
Reaction notes
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