Pyrrole has a warm, roasted, slightly animalic odor reminiscent of coffee grounds and burnt nuts. It carries a nitrogenous, earthy character with a faintly fecal or barnyard undertone at higher concentrations. Used in trace amounts it lends depth and a natural-smelling savory quality to gourmand and animalic accords.AI · claude-opus-4-7
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Perfume and Flavor Chemicals, page 1221.
Colorless liquid, but turns brown under exposure to air (oxygen) and is easily oxidized.
8% soluble in water, miscible with alcohol and oils.
Sweet and warm-ethereal, slightly burnt-nauseating odor, resembling the odor of Propyl formate.
The title material has been suggested for use in masking odors for industrial purposes, and it may serve a purpose of masking if the undesirable odor is of approximately the same volatility as Pyrrole. However, the poor stability of Pyrrole under the normally rough conditions for industrial masking make it rather difficult to justify the use of this material at all. The title material has also been suggested for use as a trace ingredient in artificial Petitgrain oils.
1) by fractionated distillation of bone oil. 2) by thermal decomposition of Ammonium mucate with Glycerin or mineral oil.