Portmess Homework Q&S 58

Portmess Homework Q&S 58 - 52 CONFORMATIONS OF...

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3.19 All the staggered conformations about the C-2 G C-3 bond of 2,2-dimethylpropane are equivalent to one another and of equal energy; they represent potential energy minima. All the eclipsed confor- mations are equivalent and represent potential energy maxima. The shape of the potential energy pro f le for internal rotation in 2,2-dimethylpropane more closely resembles that of ethane than that of butane. 3.20 The potential energy diagram of 2-methylbutane more closely resembles that of butane than that of propane in that the three staggered forms are not all of the same energy. Similarly, not all of the
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