Toluene → N-methylbenzothiazolone

HRID 847811Notes

Reaction equation

HRID 847811 reaction equation
[S:1]1(=[O:10])[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[N:3]=[CH:2]1.[OH-].[Na+].[C:13]1(C)C=CC=CC=1.S(OC)(OC)(=O)=O>O.[Br-].C([N+](CCCC)(CCCC)CCCC)CCC>[CH3:13][N:3]1[C:4]2[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=2[S:1](=[O:10])[CH2:2]1

Participants

7

Reactant 4

HCID 1140TolueneHCID 6497Dimethyl SulfateHCID 14798Sodium HydroxideHCID 53400715Benzothiazolinone

Product 1

HCID 20026384N-methylbenzothiazoloneYield 100%

Reagents, catalysts & solvents 2

HCID 74236Tetrabutylammonium BromideCatalystHCID 962WaterSolvent

Procedure

Benzothiazolone (3.78 g, 0.025 mole) was dissolved in a solution of sodium hydroxide (1.60 g, 0.0375 mole) in water (100 c.c.), and tetra-n-butylammonium bromide (0.24 g, 7.5×10-4 mole) and toluene (40 c.c.) were added thereto. Dimethyl sulfate (4.70 g, 0.0375 mole) was added dropwise thereto at room temperature, and the mixture was stirred at room temperature for 1 hour, followed by phase-separation. The toluene layer was washed once with water, and the solvent was removed under reduced pressure to obtain 4.14 g of N-methylbenzothiazolone as white crystals. Yield 100%, purity 97.7%, m.p. 70°-73.5° C.

Workup

  1. additionwere added
  2. customfollowed by phase-separation
  3. washThe toluene layer was washed once with water
  4. customthe solvent was removed under reduced pressure

Sources & evidence

ORD record
ord-15fec31171474e48afbd2565f6745829
Source dataset
uspto-grants-1981_10
Patent number
US04293702

Reaction notes

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