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 . Specifically, it may be
* 1,2-pentadiene, or ethyl allene, =C=CH––.
[
* 1,3-pentadiene, =CH–CH=CH- with two isomers:][
** ''cis''-1,3-pentadiene.
** ''trans''-1,3-pentadiene, or ]piperylene
Piperylene or 1,3-pentadiene is an organic compound with the formula . It is a volatile, flammable hydrocarbon. It is one of the five positional isomers of pentadiene.
Reactions and occurrence
Piperylene is a typical diene. It forms a sulfo ...
.
* 1,4-pentadiene, =CH––CH=.[
* 2,3-pentadiene, –CH=C=CH–, with two enantiomers (''R'' and ''S'').][
]
See also
* Allene
In organic chemistry, allenes are organic compounds in which one carbon atom has double bonds with each of its two adjacent carbon centres (). Allenes are classified as diene#Classes, cumulated dienes. The parent compound of this class is propa ...
* Pentene
Pentenes are alkenes with the chemical formula . Each contains one double bond within its molecular structure. Six different compounds are in this class, differing from each other by whether the carbon atoms are attached linearly or in a branched ...
* Pentane
Pentane is an organic compound with the formula C5H12—that is, an alkane with five carbon atoms. The term may refer to any of three structural isomers, or to a mixture of them: in the IUPAC nomenclature, however, pentane means exclusively the ' ...
* Hexadiene
1,5-Hexadiene is the organic compound with the formula (CH)(CH=CH). It is a colorless, volatile liquid. It is used as a crosslinking agent and precursor to a variety of other compounds.
Synthesis
1,5-Hexadiene is produced commercially by the et ...
* Butadiene
1,3-Butadiene () is the organic compound with the formula (CH2=CH)2. It is a colorless gas that is easily condensed to a liquid. It is important industrially as a precursor to synthetic rubber. The molecule can be viewed as the union of two viny ...
* Cyclopentadiene
Cyclopentadiene is an organic compound with the chemical formula, formula C5H6.LeRoy H. Scharpen and Victor W. Laurie (1965): "Structure of cyclopentadiene". ''The Journal of Chemical Physics'', volume 43, issue 8, pages 2765-2766. It is often ab ...
References
[James R. Durig, Stephen Bell, Gamil A. Guirgis (1996): "Infrared and Raman spectra, conformational stability, ab initio calculations and vibrational assignment for 1,2-pentadiene (ethyl allene)". ''Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy'', volume 52, issue 14, pages 1843-1859.]
[S. Boue and Rangaswamy Srinivasan (1970): "Differences in reactivity between excited states of cis- and trans-1,3-pentadiene". ''Journal of the American Chemical Association'', volume 92, issue 10, pages 3226–3227. ]
[Juergen Herzler , Jeffrey A. Manion, and Wing Tsang (2001): "1,2‐Pentadiene decomposition". ''International Journal of Chemical Kinetics'', volume 33, issue 11, pages 755-767. ]
[Aldo Priola, Sebastiano Cesca, Giuseppe Ferraris, and Mario Bruzzone (1975): "Relative reactivity of cis‐ and trans‐1,3‐pentadiene in the cationic copolymerization with isobutene". ''Die Makromolekulare Chemie'', volume 176, issue 7, pages 1969-1981. ]
[Paul N. Kogerman (1930): "Synthesis of 1,4-pentadiene". ''Journal of the American Chemical Association'', volume 52, issue 12, pages 5060–5065. ]
[Kenneth B. Wiberg, Yi-gui Wang, Shaun M. Wilson, Patrick H. Vaccaro, William L. Jorgensen, T. Daniel Crawford, Micah L. Abrams, James R. Cheeseman, and Mark Luderer (2008): "Optical Rotatory Dispersion of 2,3-Hexadiene and 2,3-Pentadiene". ''Journal of Physical Chemistry A'' J. Phys. Chem. A , 112, 2415-2422. ]
Alkadienes
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