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The defensive secretions of a number of insects are known to contain a hitherto unidentified dicarbonyl compound. This substance was isolated by gas chromatography from the contents of the scent reservoir of the green vegetable bug, Nexara viridula (L.), as part of a comprehensive investigation of the chemical composition of the scent of that insect.1 The ultraviolet and infrared absorption spectra and the mass speotrum of the compound1 were consistent with i t being trans-4-ketohex-2-enal but they did not constitute unambiguous proof of this structure. The proton magnetic resonance spectrum presented here shows that the compound is trans-4-ketohex-2enal. The spectrum is of special interest because it illustrates an unusual interaction between some of the protons.

The identification of trans-4-Ketohex-2-enal by its proton magnetic resonance spectrum