13C nuclear magnetic resonance spectra. Part 9. Strain effects on 13C chemical shifts of triamantane
Abstract
The 13C n.m.r. spectrum of triamantane (3) observed at 22.64 and 62.8 MHz is assigned using selective 1H decoupling. Internal strain causing geometrical distortions at the quaternary carbon leads to a non-additive down-field shift of its signal.