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Organic Chemistry 4 th Edition Paula Yurkanis Bruice Chapter 3 Alkenes: Structures, Nomenclature, and an Introduction to Reactivity Thermodynamics and Kinetics Irene Lee Case Western Reserve University Cleveland, OH ©2004, Prentice Hall Hydrocarbons containing double bonds C C double bond the functional group center of reactivity Alkenes Noncyclic alkene: C n H 2n Cyclic alkene: C n H 2n–2 Molecular Formula of Alkene CH 3 CH 2 =CH 2 Systematic Nomenclature of Alkenes • Longest continuous chain containing the functional group • Cite the substituents in alphabetical order • Name with the lowest functional group number and then the lowest substituent numbers • No numbering of the functional group is needed in a cyclic alkene Special Nomenclatures Structure of Alkene Isomers of Alkene Dipole Moments of Alkene Isomers