Chemistry 2223B Lecture Notes - Isoprene, Bayerischer Rundfunk, Terpene

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Chemistry 2213a fall 2012 western university. Organic structure #2: alkenes & alkynes: structure, alkenes with one c=c bond have the formula cnh2n, while alkynes with one. 2 units of unsaturation: so, each unit of unsaturation can be a bond or a ring, when there are two or more multiple bonds, they can arranged as follows: Organic structure #2: alkenes & alkynes 2: isolated: two or more bonds between bonds, conjugated: multiple bonds alternate with a bond, cumulated: two double bonds on a single carbon. What can be said about the 2p orbitals of a conjugated system: in systematic nomenclature, the multiple bond (for c=c and c c) is given the lowest possible number on the parent chain. C=c (alkene) has the suffix ene, and c c (alkyne) the suffix yne. Organic structure #2: alkenes & alkynes 3: structurally, an alkene consists of two adjacent sp2-hybridized atoms (trigonal planar). The three sp2 orbitals are used to form bonds.

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