2-Pentene
Title: 2-Pentene
CAS Registry Number: 109-68-2
Additional Names: b-n-Amylene; sym-methylethylethylene
Molecular Formula: C5H10
Molecular Weight: 70.13
Percent Composition: C 85.63%, H 14.37%
Line Formula: CH3CH2CH=CHCH3
Literature References: Prepn of mixture of cis and trans isomers by dehydration of 2-pentanol: Norris, Org. Synth. coll. vol. I, (2nd ed., 1941) p 430. Prepn of the geometrical isomers from cis- and trans-a-methyl-b-ethylacrylic acids: Lucas, Prater, J. Am. Chem. Soc. 59, 1682 (1937). Prepn of the cis form from 1-ethyl-2-iodobutyric acid with quinoline, of the trans form from 1-ethyl-2-iodobutyric acid with sodium carbonate: Sherrill, Matlak, ibid. 2134; prepn of both isomers from sec-amyl alcohol with H2SO4 and diatomaceous earth at 90-110° for 3 hrs: Lucas et al., ibid. 63, 22 (1941). Absorption spectra: Carr, Stücklen, ibid. 59, 2138 (1937).
 
Derivative Type: cis-Form
Properties: Liquid. d420 0.6503; d480 0.5824; d430 0.6392; d40 0.6710. mp -180 to -178°. bp760 37.0°. nD20 1.38130.
Melting point: mp -180 to -178°
Boiling point: bp760 37.0°
Index of refraction: nD20 1.38130
Density: d420 0.6503; d480 0.5824; d430 0.6392; d40 0.6710
 
Derivative Type: trans-Form
Properties: Liquid. d420 0.6482; d480 0.5814; d430 0.6381; d40 0.6675. mp -136 to -135°. bp760 35.85°. nD20 1.37921.
Melting point: mp -136 to -135°
Boiling point: bp760 35.85°
Index of refraction: nD20 1.37921
Density: d420 0.6482; d480 0.5814; d430 0.6381; d40 0.6675

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