The structures of the four 1,2,3,4,5,6,7-heptaacetates derived from D-
glycero-D-galacto-heptitol and its racemate, D-glycero-D-manno-heptito
l, and meso-glycero-gulo-heptitol have been determined by X-ray crysta
llography, using direct methods. The latter two substances are found i
n conformations that involve a 1,3-parallel O//O interaction.