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iso-butyl
iso-butyl n. 
/ˌʌɪsə(ʊ)ˈbjuːtɪl/, /ˌaɪsoʊˈbjuˌtɪl/ (see butyl n.).
Brit. /ˌʌɪsə(ʊ)ˈbjuːtʌɪl/
, /ˌʌɪsə(ʊ)ˈbjuːtʌɪl//ˌʌɪsə(ʊ)ˈbjuːtɪl/U.S. /ˌaɪsoʊˈbjud(ə)l/
, /ˌaɪsoʊˈbjud(ə)l//ˌaɪsoʊˈbjuˌtɪl/ΘΚΠ
the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > hydrocarbon radicals > named, by number of carbon atoms > four
ethyl1834
valyl1850
iso-butyl1866
butenyl1874
1866 H. E. Roscoe Lessons Elem. Chem. xxxvi. 320 Treated with hydriodic acid, erythrite forms iso-butyl iodide.
1870 Chem. News 21 Jan. 34/2 (heading) Conversion of isobutyl-alcohol into tertiary pseudobutyl-alcohol.
1873 H. Watts Fownes's Man. Elem. Chem. (ed. 11) 597 The [isobutyl] iodide is decomposed by potassium or sodium, yielding isodibutyl..a limpid liquid, lighter than water.
1873 H. Watts Fownes's Man. Elem. Chem. (ed. 11) 597 Isopropyl Carbinol or Isobutyl Alcohol... By oxidation it is converted into isobutyric acid.
1964 D. A. Shirley Org. Chem. x. 251 Isobutyl alcohol..is manufactured by a modification of the carbon monoxide and hydrogen method for synthesis of methanol.
1966 Nomencl. Org. Chem. (I.U.P.A.C.) (ed. 2) A. 8 The following names are retained for the unsubstituted radicals only: Isopropyl..Isobutyl..Isopentyl [etc.].
isobutyl
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isobutyl n. /ˌʌɪsə(ʊ)ˈbjuːtɪl/, /ˌaɪsoʊˈbjuˌtɪl/ the radical (CH3)2CH·CH2—, 2-methylpropyl, as in isobutyl alcohol n. (CH3)2CH·CH2OH, a primary alcohol which is a colourless liquid and occurs in fusel oils.
Brit. /ˌʌɪsə(ʊ)ˈbjuːtʌɪl/
, /ˌʌɪsə(ʊ)ˈbjuːtʌɪl//ˌʌɪsə(ʊ)ˈbjuːtɪl/U.S. /ˌaɪsoʊˈbjud(ə)l/
, /ˌaɪsoʊˈbjud(ə)l//ˌaɪsoʊˈbjuˌtɪl/<
as lemmas
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