UH CHEM 3331 - Alkanes Conformational Analysis (3 pages)

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Alkanes Conformational Analysis



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Alkanes Conformational Analysis

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Lecture number:
6
Pages:
3
Type:
Lecture Note
School:
University of Houston
Course:
Chem 3331 - Organic Chemistry
Edition:
1
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CHEM 333 1nd Edition Lecture 6 Outline of Last Lecture I Review of hydrocarbons II Nomenclature III Physical properties IV Uses and sources of alkanes V Reactions of alkanes Outline of Current Lecture I Conformational analysis II Newman projection formula for ethane III Newman projection formula for propane IV Newman projection formula for butane Current Lecture I Conformational analysis Conformational analysis deals with the shapes molecules make when they are rotated around singe bonds For C2H6 we have two different shapes due to the rotation around the single bond between carbons The rotamers here are conformers These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute II Newman projection formula for ethane As we know ethane has an eclipsed and staggered isomer In the eclipsed isomer there is 0 between hydrogen atoms looking from the view of a carbon atom In the staggered isomer there is 60 between hydrogen atoms from the view of a carbon atom See below Every hydrogen bond that eclipses is equal to 1 kcal mol Therefore the torsional strain is equal to 3 kcal mol III Newman projection for propane Propane or CH3 CH2 CH3 will consist of 5 hydrogens and a methane when looking at the view from a carbon atom The torsional strain for propane is 3 3 kcal mol because there are two hydrogen bonds which each equal 1 kcal mol and a hydrogen to methane bond which equals 1 3 kcal mol IV Newman projection of butane When analyzing butane we examine it from the bond between C2 and C3 Here we have eclipsed staggered gauche and anti conformation conformations The dots represent CH3 As the CH3 molecules move farther apart the energy decreases while as they become totally eclipsed the conformations on the ends the energy is the highest



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