Chem 231 Ch.4 Alkenes and Alkynes

Chem 231 Ch.4 Alkenes and Alkynes - Alkenes and Alkynes...

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4.1 Structure A. Alkenes: unsaturated hydrocarbons that contain at least one double bond B. Orbital Overlap Model of the C=C C. cis-trans Isomerism 1) Each C of the double bond must have two different groups attached to it. 2) Restricted rotation about the C=C prevents conversion from cis to trans 3) trans- alkenes are more stable: less nonbonded interaction strain. D. Alkynes: unsaturated hydrocarbons that contain at least one triple bond 4.2 Nomenclature A. IUPAC Names 1) Alkenes: -an- changed to -en- 2) alkene parent name is taken from the longest chain that contains the double bond. 3) the location of the double bond is indicated by the number of the first carbon of the double bond. 4) alkynes: -an- changed to -yn- 5) alkyne parent name is taken from the longest chain that contains the triple bond. 6) the location of the triple bond is indicated by the number of the first carbon is the triple bond. B. Common Names(not necessarily testing us on these)
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This note was uploaded on 04/08/2009 for the course CHM 231 taught by Professor Barrows during the Spring '08 term at Grand Valley State.

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Chem 231 Ch.4 Alkenes and Alkynes - Alkenes and Alkynes...

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