1,3:4,6-Di-O-benzylidene-2,5-O-3,6,9,12-tetraoxatetradecane-l,14-diyl-D-mannitol and the solution state structure of its molecular complex with the benzylammonium cation. A variable-temperature 1H n.m.r. spectroscopic investigation

Abstract

The results of variable-temperature ¹H n.m.r. spectroscopic investigations, including both multiple irradiation experiments and qualitative measurements of nuclear Overhauser effects, on D-(2)-PhCH₂NH₃ClO₄ indicate that the conformation (H_a/H_c) in which the phenyl ring in the cation is oriented over one of the 1,3-dioxan rings in D-(2) becomes increasingly preferred in CD₂Cl₂ solution as the temperature is lowered.