Conformational equilibria and barriers to rotation in monohalogenobutanes with methyl substituents. Methyl–halogen interactions. The size of a halogen atom
Abstract
An n.m.r. study of barriers to rotation and conformational equilibria in 2-halogeno-2, 3, 3-trimethylbutanes and 2-halogeno-2, 3-dimethylbutanes is reported. Results are discussed in terms of the steric requirement of halogen atoms, and the interaction of these atoms with adjacent methyl groups.