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Alkenes and Alkynes

Alkenes and Alkynes. SWBAT: Name and Draw Alkenes and Alkynes. More Substituent Groups. m ethoxy -OCH 3 nitro -NO 2 n eopentyl neohexyl vinyl -CH=CH 2 allyl -CH2-CH=CH 2. Only iso-, neo- are alphabetized, tert, sec are not.

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Alkenes and Alkynes

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  1. Alkenes and Alkynes SWBAT: Name and Draw Alkenes and Alkynes

  2. More Substituent Groups • methoxy -OCH3 • nitro -NO2 • neopentyl • neohexyl • vinyl -CH=CH2 • allyl -CH2-CH=CH2 Only iso-, neo- are alphabetized, tert, sec are not neopentyl, neohexyl, vinyl and allyl are usually only found on aromatic compounds

  3. Alkenes – naming rules • Number longest continuous chain of carbons, double bond receives lowest possible numbers • Alphabetize groups without using prefixes • Use cis and trans stereoisomerism • List the numbers for the double bonds • Alkenes end in -ene • If more than one double bond end in diene, triene, tetraene

  4. Alkenes Practice 5-chloro-2-hexene 1,5-dichloro-1,4-hexadiene CH3–CH=CH–CH2–CH3 2-pentene

  5. Alkenes Practice trans-8-ethyl-3-undecene 1,2-difluoro-cyclohexene 5-bromo-4-chloro-7,7-dimethyl-4-undecene 4-ethenylcyclohexanol Tip – 11 carbon is undec-

  6. Stereoisomerism Carbon that is double bonded (alkenes) have an sp2 hybridization – so they are trigonal planer – ergo, we need to account for placement of substituents Cis Trans

  7. Alkenes Practice c 5-chloro-cis-2-hexene

  8. Cycloalkenes – naming rules • Number the carbons double bond receives the lowest possible number, start with #1 • Groups receive next lowest number • List groups • List double bond numbers • Long chain name • End in diene, triene, tetraene for multiple double bonds

  9. Naming alkenes (Don’t forget the cis or trans) 5 – methyl – trans – 2 – heptene Why is the cyclohexene numbered the way it is numbered?

  10. Alkynes • Naming is similar to alkenes except no cis or trans. • Alkynes end in -yne

  11. Moodle • Sign out a computer • Go to Moodle (link off my website) • Go through all links under • Alkanes • Alkenes & Alkynes

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