|Preferred IUPAC name
3D model (Jmol)
|Molar mass||111.14 g·mol−1|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
2-Acetyl-1-pyrroline, abbreviated 2AP, with the IUPAC name 1-(3,4-dihydro-2H-pyrrol-5-yl)ethanone, is an aroma compound and flavor that gives white bread, jasmine rice and basmati rice, the spice pandan (Pandanus amaryllifolius), and bread flowers (Vallaris glabra) their customary smell. Many observers describe the smell as similar to "hot, buttered popcorn", and it is credited for lending this odor to the scent of binturong (bearcat) urine. Fresh MF and urine of the tiger (Indian, Amur or Siberian) and Indian leopard have a strong aroma due to 2-acetyl-1-pyrroline (2AP).  2-Acetyl-1-pyrroline and its structural homolog, 6-acetyl-2,3,4,5-tetrahydropyridine of similar smell, can be formed by Maillard reactions during heating of food such as the baking of bread dough. Both compounds have odor thresholds below 0.06 ng/l.
Structure and properties
- S. Wongpornchai; T. Sriseadka; S. Choonvisase (2003). "Identification and quantitation of the rice aroma compound, 2-acetyl-1-pyrroline, in bread flowers (Vallaris glabra Ktze)". J. Agric. Food. Chem. 51 (2): 457–462. doi:10.1021/jf025856x. PMID 12517110.
- "Why bearcats smell like buttered popcorn". Duke University/Eurekalert. 2016-04-13.
- Brahmachary, Poddar-Sarkar. "Fifty years of tiger pheromone research" (PDF). Archived (PDF) from the original on 2015-06-27. Retrieved 2017-03-25.
- T. J. Harrison; G. R. Dake (2005). "An expeditious, high-yielding construction of the food aroma compounds 6-acetyl-1,2,3,4-tetrahydropyridine and 2-acetyl-1-pyrroline". J. Org. Chem. 70 (26): 10872–10874. doi:10.1021/jo051940a. PMID 16356012.