3.21Van der Waals strain between the tert-butyl groups in 2,2,4,4-tetramethylpentane causes theC-2GC-3GC-4 angle to open to 125–128°.3.22The structure shown in the text is not the most stable conformation, because the bonds of the methylgroup are eclipsed with those of the ring carbon to which it is attached. The most stable conforma-tion has the bonds of the methyl group and its attached carbon in a staggered relationship.3.23Structure A has the hydrogens of its methyl group eclipsed with the ring bonds and is less stablethan B. The methyl group in structure B has its bonds and those of its attached ring carbon in a stag-gered relationship.Furthermore, two of the hydrogens of the methyl group of A are uncomfortably close to two axialhydrogens of the ring.3.24Conformation B is more stable than A. The methyl groups are rather close together in A, resulting in
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