About: Pentadiene

In chemistry, pentadiene is any hydrocarbon with an open chain of five carbons, connected by two single bonds and two double bonds. All those compounds have the same molecular formula C5H8. Specifically, it may be * 1,2-pentadiene, or ethyl allene, H2C=C=CH–CH2–CH3. * 1,3-pentadiene, H2C=CH–CH=CH-CH3 with two isomers: * cis-1,3-pentadiene. * trans-1,3-pentadiene, or piperylene. * 1,4-pentadiene, H2C=CH–CH2–CH=CH2. * 2,3-pentadiene, H3C–CH=C=CH–CH3, with two enantiomers (R and S).