Non-selective, proton spin–lattice relaxation rates measured at 400 mhz: a quantitative determination of the geometry of diamagnetic molecules in solution

Abstract

Initial slope, non-selective, spin–lattice relaxation rates have been determined at 400 MHz for 1,2,3,4-tetra-O-acetyl-β-D-arabinopyranose (1) and for its 5,5-dideuterio derivative (2) and its two isomeric 5-deuterio derivatives (3) and (4); simple comparisons of these data give the specific interproton relaxation contributions arising via the dipole–dipole mechanism, from which the magnitudes of interproton distances can be calculated, the values of which are in very close agreement with values obtained by neutron diffraction.