Correlations between hardness, electronegativity, anomeric effect associated with electron delocalizations and electrostatic interactions in 1,4,5,8-tetraoxadecalin and its analogs containing S and Se atoms

Schematic representation of the donor-acceptor electron delocalizations in the cis- and trans-stereoisomers of compounds 1-3 [M = O (1), M = S (2), M = Se (3)].