Lecture_8

Lecture_8 - Lecture 8 Chapter 2 Wrap ­up Chapter...

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Unformatted text preview: Lecture 8 Chapter 2 Wrap ­up Chapter 3: Alkene Structure, Nomenclature, and Reac=vity Ring Flipping Newman Projec=on Explains Stability BeKer 1,3 ­Diaxial Repulsion  What is 1,3 ­diaxial repulsion? Subs=tuent Size and Equilibrium  The bigger the group, the more it’s equatorial Geometric Isomers  The descriptors cis ­ and trans ­ are used to designate the “conforma?on” of the subs?tuents rela?ve to each other. Which is More Stable? A.  cis ­1,4 ­dimethylcyclohexane B.  trans ­1,4 ­dimethylcyclohexane C.  Both have same stability D.  Not sure Which is More Stable? A.  cis ­1,4 ­dimethylcyclohexane B.  trans ­1,4 ­dimethylcyclohexane C.  Both have same stability D.  Not sure Which is more stable?  Within the trans itself, there are two possibili?es… Fused Rings Alkene Nomenclature  Alkenes some?mes called olefins  C=C bonds…..Replace “ane” with “ene” –  Systema?c names… ethene, propene –  Common names… ethylene, propylene  Step 1: Name longest chain with alkene Alkene Nomenclature  Step 2: Two double bonds gets name “diene”  Step 3: Alkene gets lowest number, not subs. Alkene Nomenclature  Step 4: Mul?ple subs in alphabe?cal order  Step 5: If alkene has same count in either direc?on, subs get lowest number possible ...
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This note was uploaded on 09/09/2011 for the course CHEM 109A taught by Professor Bruice during the Spring '07 term at UCSB.

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