Pyrethrin II

除虫菊素Ⅱ

Also known as: Pyrethrin 2, Pyrethrin B, (1S)-2-Methyl-4-oxo-3-[(2E)-2,4-pentadien-1-yl]-2-cyclopenten-1-yl (1R,3R)-3-[(1E)-3-methoxy-2-methyl-3-oxo-1-propen-1-yl]-2,2-dimethylcyclopropanecarboxylate, Cyclopropanecarboxylic acid, 3-[(1E)-3-methoxy-2-methyl-3-oxo-1-propen-1-yl]-2,2-dimethyl-, (1S)-2-methyl-4-oxo-3-[(2E)-2,4-pentadien-1-yl]-2-cyclopenten-1-yl ester, (1R,3R)-, EINECS 204-462-6

Pyrethrin II (CAS 121-29-9) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C22H28O5 and a molecular weight of 372.455 g/mol. It is also known as Pyrethrin 2, Pyrethrin B and (1S)-2-Methyl-4-oxo-3-[(2E)-2,4-pentadien-1-yl]-2-cyclopenten-1-yl (1R,3R)-3-[(1E)-3-methoxy-2-methyl-3-oxo-1-propen-1-yl]-2,2-dimethylcyclopropanecarboxylate. Key properties include a boiling point of 473.7±45.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 203.8±28.8 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

121-29-9

Jingsj CID

J-13744-9

Molecular Formula

C₂₂H₂₈O₅

Chinese Name

除虫菊素Ⅱ

Molecular Weight

372.455 g/mol

Category

Organic Compounds

Last updated

8/21/2026