Portmess Homework Q&S 57

Portmess Homework Q&S 57 - 51 CONFORMATIONS OF...

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( b ) The O G H proton may be anti to one N G H proton and gauche to the other (left) or it may be gauche to both (right). 3.16 Conformation ( a ) is the most stable; all its bonds are staggered. Conformation ( c ) is the least stable; all its bonds are eclipsed. 3.17 ( a ) First write out the structural formula of 2,2-dimethylbutane in order to identify the substituent groups attached to C-2 and C-3. As shown at left, C-2 bears three methyl groups, and C-3 bears two hydrogens and a methyl group. The most stable conformation is the staggered one shown at right. All other staggered conformations are equivalent to this one. ( b ) The constitution of 2-methylbutane and its two most stable conformations are shown. Both conformations are staggered. In one (left), the methyl group at C-3 is gauche to both of the C-2 methyls. In the other (right), the methyl group at C-3 is gauche to one of the C-2
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