Two C-Unsubstituted Enaminals

In both 3-(N,N-diisopropylamino)-2-propenal, C₉H₁₇NO, (3), and 3-(1,2,3,4-tetrahydro-1-quinolinyl)-2-propenal, C₁₂H₁₃NO, (4), the entire enaminal system (O1-C1-C2-C3-N4) is approximately planar. The angles around the N atoms in (3) and (4) sum to values near 360°, indicating planarity in both molecules. One of the two crystallographically independent molecules of (3) exhibits disorder in its isopropyl groups.

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