A New Keto-alcohol, (−)-Mintlactone, (+)-isoMintlactone and Minor Components in Peppermint Oil

Abstract
Eighty-one constituents were newly identified from the oil of Mentha piperita L., including a new keto-alcohol, (−)-mintlactone and (+)-isomintlactone. They were determined by spectral data and syntheses to be 4-hydroxy-4-methyl-2-cyclohexen-1-one (8), (6R, 7aR) (10) and (6R, 7aS)-3,6-dimethyl-5,6,7,7a-tetrahydro-2(4H)-benzofuranone (11), respectively.

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