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2,3-Undecadione has a strong, sweet cream, warm odor with a coconut oil note. It has a sweet cream and coconut milk taste.

ChEBI: 2,3-Undecanedione is an alpha-diketone.

By reacting 3-bromo-2-undecanone with sodium azide in diluted methanol and then boiling the resulting solution with concentrated HCl; also from methyl nonyl ketone via the monoxime of the title material.

Taste characteristics at 2.5 ppm: aldehydic, creamy, buttery and dairy-like with waxy, rancid and fat nuances.