signment based on vicinal coupling constants in the 300-MHz NMR spectrum. "From MM2 model calculations.4 Ratios are obtained from Boltzmann distribution over the six staggered transition-state conformations. ''Conformations with one group anti and one inside are essentially the same in energy as conformations with one group anti and one outside. "No lone pairs were included on the ether oxygen. With lone pairs included, a 96:4 ratio is predicted.
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