Zur Konformation von 2‐Alkyl‐3‐amino‐ und 2‐Alkyl‐3‐ethoxyacroleinen

Note on the Conformation of 2‐Alkyl‐3‐amino‐ and 2‐Alkyl‐3‐ethoxyacroleins 2‐Alkyl‐3‐aminoacroleins are found by 1 H‐ and 13 C‐NMR to prefer the E ‐configuration at 30°C in hydrogen bonding solvents. In less protic solvents, the Z‐s‐Z isomer is recognized which predominates at lower temperatures. The corresponding 3‐ethoxyacroleins only exist in the E ‐configuration under these conditions as their Z‐s‐Z conformation cannot be stabilized by intramolecular hydrogen bonding.