[CH3:1][NH:2][CH3:3].Br[CH2:5][CH2:6][CH2:7][CH:8]=[C:9]([C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)[C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1>C1COCC1>[CH3:1][N:2]([CH2:5][CH2:6][CH2:7][CH:8]=[C:9]([C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)[C:16]1[CH:17]=[CH:18][CH:19]=[CH:20][CH:21]=1)[CH3:3]Next, an aqueous solution (40%) of dimethyl amine (25 equivalents) is added slowly to a THF solution of 1.0 equivalent of 5-bromo-1,1-diphenyl-1-pentene that has been obtained in the previous step. The mixture is then stirred at room temperature for 24 hours, and worked up in the usual manner to yield 5-(N,N-dimethyl)amino-1,1-diphenyl-1-pentene as a yellow oil.
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