naming-hydrocarbons-handout

naming-hydrocarbons-handout - Naming Hydrocarbons...

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Handout: Hydrocarbons: IUPAC names Naming Hydrocarbons (nomenclature) Drawing structures: it’s all good C H 3 C H C H CH 3 C H 3 CH 3 C H 3 CH CH CH 3 2-butene This is called the “condensed structure” CCCC H H H HHH H H C H 3 CH CH CH 3 On a test, choose a method that shows all Hs CH 3 CH=CHCH 3 Using brackets can also shorten some formulas: CH 3 (CH 2 ) 4 CH 3 vs. CH 3 CH 2 CH 2 CH 2 CH 2 CH 3 Background: formulas for HCs • Alkanes= C n H 2n+2 , enes= C n H 2n , ynes= C n H 2n-2 • Remember enes, then think of what would happen if bond was single or triple instead. • Provides some useful information (e.g. for compositional analysis, or to check work) • Cannot always tell hydrocarbon type based on numbers (e.g. propyne vs. propadiene) Q - how many hydrogens in each of these: 6 carbon alkane Alkene: C 22 H C H 3 CH 3 Naming: common vs. IUPAC • Common names used in the 1800’s are still used for some compounds today: HCCH Acetylene O C CH 3 C H 3 Acetone Formic acid C O OH H
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