6,7-Dihydro-5-methyl-5(H)-cyclopentapyrazine

5H-5-Methyl-6,7-dihydrocyclopenta(-b)pyrazine has an earthy, baked potato, peanut, roasted odor. It may be prepared from condensation of 2-hydroxy-3-methyl-2-cyclopentene-l-one and ethylene diamine; by condensing a cyclopentenolone with alkylenediamines, or alternatively, an aliphatic α-diketone with 1,2-diamino cyclopentane; the resulting product is dehydrogenated in the presence of palladium over activated charcoal or copper chromite.

clear yellow to yellow-orange to brown liquid

5H-5-Methyl-6,7-dihydrocyclopenta(b)pyrazine has an earthy, peanut, roasted odor

Reported found in peanuts, filberts, asparagus, potato wheat and rye bread, cooked beef, pork, pork liver, beer, cocoa, coffee, green tea, barley, filberts, almond, sesame seed, malt and wort

5-Methyl-6,7-dihydrocyclopentapyrazine can be used for drug storage packaging and antibacterial composition.

ChEBI: 6,7-Dihydro-5-methyl-5H-cyclopenta[b]pyrazine is a member of pyrazines.

From condensation of 2-hydroxy-3-methyl-2-cyclopentene-1-one and ethylene diamine; by condensing a cyclopentenolone with alkylenediamines, or alternatively, and aliphatic α-diketone with 1,2-diamino cyclopentane; the resulting product is dehydrogenated in the presence of palladium over activated charcoal or copper chromite.

Aroma characteristics at 1.0%: sweet, nutty, roasted, toasted, grainy, coffee and corn with savory, meaty nuances.

Taste characteristics at 15 ppm: nut skin, brown, roasted, oily with a cocoa and coffee nuance, musty, nutty, and grainy

5H-5-Methyl-6,7-dihydrocyclopenta[b]pyrazine is the major flavor compound of palm sugar. It is also found in coffee and cooked meat.