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About CCA!
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Voiceover
Free rotation about the bond between carbons 2 and 3 of butane reveals steric crowding when the methyl groups are eclipsed. The energy decreases as the methyl groups move farther apart. The anti-conformation of butane, the lowest energy arrangement is formed when the methyl groups are opposite each other. This may be shown in a Newman projection. If the model is twisted (120°) a higher energy staggered conformation called the gauche form is obtained. The Newman projection of the gauche form of butane is illustrated.
Discussion
Ball-and-stick and Space-filling Models of Butane |
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Energy versus Angle of Rotation for Butane |
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Design, Text and Demonstrator:
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Gary Trammell
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University of Illinois at Springfield, Springfield, IL 62794
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Videographer/Editor:
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Steve Dykema
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University of Illinois at Springfield, Springfield, IL 62794
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Voice:
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Margaret Biddle
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University of Wisconsin - Madison, Madison, WI 53706
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Audio Production:
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Greg Minix
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University of Wisconsin - Madison, College of Engineering, Madison, WI 53706
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Jerrold J. Jacobsen
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University of Wisconsin - Madison, Madison, WI 53706
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