Anomeric effect cannot be explained by hyperconjugation alone
Computational analysis suggests that the anomeric effect arises from a combination of factors and is not limited to just hyperconjugation. Researchers say that this ‘curiosity-driven’ work reminds chemists that attributing the effect to one dominant cause oversimplifies a ‘fundamentally complex phenomenon’. The anomeric effect helps chemists rationalise why substituents next to a heteroatom in a ring preferentially adopt an axial configuration, rather than the less sterically hindered equatorial orientation. Hyperconjugation of a heteroatom’s lone pair of electrons into the anti-bonding orbital of an adjacent substituent is a common explanation for this effect. However, previous studies suggest that other factors such as stereoelectronics and solvent interactions also play a part.1 Researchers at Florida State University in the US have now tried to quantify the influence of such factors.2 To do this, the team computationally analysed 49 monosubstituted tetrahydropyrans – rings wi...