Studies of sterically hindered and overcrowded molecules

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Abstract
The proton magnetic resonance spectra of ten mono-derivatives of benzene, mesitylene and 1,3,5-tri-t-butylbenzene have been compared to investigate (a) the effect of substituent-ring angle on the chemical shifts of ring protons, substituent protons and protons of groups attached to the ring, and (b) the properties of molecules in which the atoms approach closer than their van der Walls radii.