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11042009 - Nomenclature of Alkynes • The parent chain...

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CH 310M/318M – MWF 12:00 – Lecture 30 – W 11/4/2009 Reading Assignment : Sections 7.7, 7.8 Graded Homework : HW#15 deadline = 3:00 p.m. on Thu 11/5 HW#16 deadline = 3:00 p.m. on Mon 11/9 Textbook Problems : 7.3, 7.8, 7.10, 7.15, 7.26, 7.27 Last Time : Ozonolysis of alkenes Preparation of vicinal diols from alkenes – dihydroxylation Preparation of alkanes from alkenes – catalytic reduction (end Ch. 6) Structure and nomenclature of alkynes (begin Ch. 7) Today : Nomenclature of alkynes (continued…) Acidity of terminal alkynes & alkylation of acetylide anions Preparation of alkynes via dehydrohalogenation of vicinal & geminal dihalides
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The suffix “–yne” is used in naming alkynes
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Unformatted text preview: Nomenclature of Alkynes • The parent chain must contain the triple bond. Number the parent chain to give the triple bond the lowest number possible. • If both double bonds and triple bonds are present, the parent chain should include the greatest number of double & triple bonds. Number the parent chain to give the first multiple bond encountered the lowest number possible. Double bonds are always cited first in the name. .. • If both possible ways of numbering the parent chain are equivalent, double bonds take precedence over triple bonds and should be given lower numbers...
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