THE PROTON RESONANCE SPECTRUM OF 2-FURANACROLEIN

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Abstract
The proton resonance spectrum of 2-furanacrolein consists of two effectively independent ABX spectra, that due to the ring protons and that due to the side-chain protons. The solvent effects are such that the latter reduces to an AA1X case. The ABX and AA1X cases are discussed as deviations from the A2X case. The difference is simply that forbidden singlet–triplet transitions in the A2X case become allowed in the ABX case because the singlet and triplet states are uncoupled as the A2 nuclei become nonequivalent. Energy level diagrams are given to illustrate this situation.