View source for Chemistry: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 {{chem|C|5|H|8}}.  Specifically, it may be
* 1,2-pentadiene, or ethyl allene, {{chem|H|2|C}}=C=CH–{{chem|CH|2}}–{{chem|CH|3}}.<ref name=durig1996/><ref name=herz2001/>
* 1,3-pentadiene,  {{chem|H|2|C}}=CH–CH=CH-{{chem|CH|3}} with two isomers:<ref name=boue1970/><ref name=prio1975/>
** ''cis''-1,3-pentadiene.
** ''trans''-1,3-pentadiene, or [[Chemistry:Piperylene|piperylene]].
* 1,4-pentadiene, {{chem|H|2|C}}=CH–{{chem|CH|2}}–CH={{chem|CH|2}}.<ref name=koge1930/>
* 2,3-pentadiene, {{chem|H|3|C}}–CH=C=CH–{{chem|CH|3}}, with two enantiomers (''R'' and ''S'').<ref name=wibe2008/>

==See also==
* [[Chemistry:Pentene|Pentene]]
* [[Chemistry:Pentane|Pentane]]
* Hexadiene
* [[Chemistry:Butadiene|Butadiene]]
* [[Chemistry:Cyclopentadiene|Cyclopentadiene]]

==References==
<references>
<ref name=durig1996>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.{{doi|10.1016/S0584-8539(96)01740-0}}</ref>

<ref name=boue1970>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. {{doi|10.1021/ja00713a074}}</ref>

<ref name=herz2001>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. {{doi|10.1002/kin.1072}}</ref>

<ref name=prio1975>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. {{doi|10.1002/macp.1975.021760707}}</ref>

<ref name=koge1930>Paul N. Kogerman (1930): "Synthesis of 1,4-pentadiene". ''Journal of the American Chemical Association'', volume 52, issue 12, pages 5060–5065. {{doi|10.1021/ja01375a064}}</ref>

<ref name=wibe2008>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. {{doi|10.1021/jp076572o}}</ref>
</references>

[[Category:Hydrocarbons]]



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