(b)The OGH proton may be anti to one NGH proton and gauche to the other (left) or it may begauche to both (right).3.16Conformation (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 substituentgroups attached to C-2 and C-3. As shown at left, C-2 bears three methyl groups, and C-3bears two hydrogens and a methyl group. The most stable conformation is the staggered oneshown 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 ofthe 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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