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isobutylene
isobutylene n. 
/ˌʌɪsə(ʊ)ˈbjuːtl̩iːn/,
Brit. /ˌʌɪsə(ʊ)ˈbjuːtᵻliːn/
, /ˌʌɪsə(ʊ)ˈbjuːtᵻliːn//ˌʌɪsə(ʊ)ˈbjuːtl̩iːn/U.S. /ˌaɪsoʊˈbjudlˌin/
(also †iso'butylen) 2-methylpropylene, (CH3)2C:CH2, an easily liquefied gas used in the manufacture of butyl rubber./ˌaɪsoʊˈbjudlˌin/ΘΚΠ
the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > alkenes > branched-chain > isobutene
isobutylene1872
isobutene1876
1872 Chem. News 29 Nov. 265/2 Chlorhydric acid behaves with isobutylen in the same manner as iodhydric acid, the result being the formation of a tertiary chloride of butyl.
1913 J. B. Cohen Org. Chem. Adv. Students II. ii. 119 Isobutylene when heated with strong sulphuric acid yields a mixture of isomeric diisobutylenes.
1951 Economist 29 Dec. 1599/2 It should produce butyl rubber based almost entirely on iso-butylene.
1969 R. F. Lang tr. F. A. Henglein Chem. Technol. 576 Cracking gases consist of ethylene, propylene and isobutylene... Isobutylene yields on polymerization a dimer which can be hydrogenated to iso-octane.
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