Reaction equation
[CH3:1][C:2]1[NH:6][C:5]2[CH:7]=[CH:8][CH:9]=[CH:10][C:4]=2[N:3]=1.[Cl-].[OH-].[Na+].Br[CH2:15][CH2:16][CH2:17][Cl:18]>>[Cl:18][CH2:17][CH2:16][CH2:15][N:3]1[C:4]2[CH:10]=[CH:9][CH:8]=[CH:7][C:5]=2[N:6]=[C:2]1[CH3:1]Participants
Conditions
- Temperature
- 40 °C
Procedure
To a stirred mixture of 13.2 parts of 2-methyl-1H-benzimidazole, 2 parts of N,N,N-triethylbenzenemathanaminium chloride and 150 parts of a sodium hydroxide solution 60% are added 30 parts of 1-bromo-3-chloropropane. To start the reaction, the whole is heated to about 40° C., whereupon the temperature rises to 50° C. (exothermic reaction). Stirring at about 50° C. is continued for 30 minutes. The reaction mixture is poured onto water and the product is extracted with methylbenzene. The extract is dried, filtered and evaporated. The residue is purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (90:10) as eluent. The pure fractions are collected and the eluent is evaporated, yielding 1-(3-chloropropyl)-2-methyl-1H-benzimidazole as a residue.
Workup
- customthe reaction
- customrises to 50° C.
- custom(exothermic reaction)
- additionThe reaction mixture is poured onto water
- extractionthe product is extracted with methylbenzene
- customThe extract is dried
- filtrationfiltered
- customevaporated
- customThe residue is purified by column-chromatography over silica gel using
- additiona mixture of trichloromethane and methanol (90:10) as eluent
- customThe pure fractions are collected
- customthe eluent is evaporated
Sources & evidence
- ORD record
- ord-42631a70ea0d43f9bbb1e9e1d59ea246
- Source dataset
- uspto-grants-1981_02
- Patent number
- US04250176
Linked notes
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