2-Butene

changed changed 477212869 2-Butene Cis-2-Buten.svg skin-invert-image cis Trans-2-Buten.svg skin-invert-image trans Cis-but-2-ene-3D-balls.png bg-transparent cis Trans-but-2-ene-3D-balls.png bg-transparent trans But-2-eneInternational Union of Pure and Applied Chemistry 2014 Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013 https://iupac.qmul.ac.uk/BlueBook/ The Royal Society of Chemistry P-45.6.2 10.1039/9781849733069 978-0-85404-182-4 β-Butylene (cis) (trans) 1/C4H8/c1-3-4-2/h3-4H,1-2H3 correct chemspider 1S/C4H8/c1-3-4-2/h3-4H,1-2H3 IAQRGUVFOMOMEM-UHFFFAOYAW correct chemspider IAQRGUVFOMOMEM-UHFFFAOYSA-N 5287573 changed chemspider 4449912 C/C=C\C 1S/C4H8/c1-3-4-2/h3-4H,1-2H3/b4-3- IAQRGUVFOMOMEM-ARJAWSKDSA-N 62695 changed chemspider 56442 C/C=C/C 1S/C4H8/c1-3-4-2/h3-4H,1-2H3/b4-3+ IAQRGUVFOMOMEM-ONEGZZNKSA-N correct EBI 48363 48366 48365 correct FDA S1SK37516R correct FDA L35ORC9C05 correct FDA 017NGL487F C(=CC)C 107-01-7 correct CAS 590-18-1 correct CAS 624-64-6 correct CAS 203-452-9 correct chemspider 11719 EM2932000 1718756 1718755 1361341 25196 1140 1141 4 8 0.641 g/ml (cis, 3.7 °C)4902420.626 g/ml (trans, 0.9 °C)490266 -138.9 (cis)−105.5 °C (trans) 0.8 to 3.7 (Z = 3.7 °C) (E = 0.8 °C) −42.6·10−6 cm3/mol (cis) −43.3·10−6 cm3/mol (trans) 03 97 cis-2-Butene March 1996. 03 98 trans-2-Butene March 1996. 02 exclamation mark Flam. Gas 1 Press. Gas DANGER 220 210 377 381 403 1 4 0 -72 325 1-Butenecis-2-Butenetrans-2-ButeneIsobutene butenes ButaneButyne 2-Butene is an acyclic alkene with four carbon atoms. It is the simplest alkene exhibiting cis/trans-isomerism (also known as (E/Z)-isomerism); that is, it exists as two geometric isomers cis-2-butene ((Z)-but-2-ene) and trans-2-butene ((E)-but-2-ene). It is a petrochemical, produced by the catalytic cracking of crude oil or the dimerization of ethylene. Its main uses are in the production of high-octane gasoline (petrol) on alkylation units and butadiene,107017 2-Butene February 1995. although some 2-butene is also used to produce the solvent butanone via hydration reaction to 2-butanol followed by oxidation. The two isomers are extremely difficult to separate by distillation because of the proximity of their boiling points (~4 °C for cis and ~1 °C for transInChem: Chemical Safety Information from Intergovernmental Organizations https://web.archive.org/web/20091209074235/http://www.inchem.org/ December 9, 2009 ). However, separation is unnecessary in most industrial settings, as both isomers behave similarly in most of the desired reactions. A typical industrial 2-butene mixture is 70% (Z)-but-2-ene (cis-isomer) and 30% (E)-but-2-ene (trans-isomer). Butane and 1-butene are common impurities, present at 1% or more in industrial mixtures, which also contain smaller amounts of isobutene, butadiene and butyne. References External links 107017 2-Butene February 1995 Category:Alkenes