[F:1][B-:2]([F:5])([F:4])[F:3].[CH3:6][N+:7]1[CH2:11][CH2:10][C:9]([CH3:18])([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[C:8]=1[CH3:19].Cl[CH2:21]Cl.[N+](=C)=[N-]>C(OCC)C>[F:1][B-:2]([F:5])([F:4])[F:3].[CH3:6][N+:7]12[CH2:19][C:8]1([CH3:21])[C:9]([CH3:18])([C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1)[CH2:10][CH2:11]2A solution of 17 g. of 1,2,3-trimethyl-3-phenyl-1-pyrrolinium tetrafluoroborate in 400 cc. of dichloromethane was stirred and cooled to 0° C. in an ice-water bath. A solution of diazomethane in diethyl ether was added dropwise to the reaction mixture over 21/2 hours. The reaction mixture was warmed to 25° C. and stirred for 12 hours. The solvent was evaporated from the reaction mixture under reduced pressure to provide 1,2,3-trimethyl-3-phenyl-1,2-methylene pyrrolidinium tetrafluoroborate as a solid. M.P. 151°-155° C.
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