[C:1]([CH2:3][C:4]([NH:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=1[CH2:13][CH3:14])=[O:5])#[N:2].CO[C:17](OC)([N:19]([CH3:21])[CH3:20])[CH3:18]>>[C:1](/[C:3](=[C:17](/[N:19]([CH3:21])[CH3:20])\[CH3:18])/[C:4]([NH:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=1[CH2:13][CH3:14])=[O:5])#[N:2]As for Example 1, 2-cyano-2'-ethylacetanilide is heated with N,N-dimethylacetamide dimethylacetal to give 2-cyano-3-dimethylamino-2'-ethylcrotonanilide as colorless prisms, m.p. 79°-81.5° C.
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