Crystal structures of β-chalcogeno-α, β-unsaturated chalcogenoesters: Novel intramolecular interaction between the carbonyl oxygen and the chalcogen atom at the β-position

A series of β‐chalcogeno‐α, β‐unsaturated chalcogenoesters (1 and 2) were synthesized, and their molecular structures were investigated in detail by X‐ray crystal analyses. Interestingly, intramolecular interactions between the carbonyl oxygen and the chalcogen atom at the β‐position (β‐S ···O and β‐Se···O) were observed in most cases, and intermolecular π–π interaction and hydrogen bonding were observed in the case of δ‐hydroxy derivatives (1b and 2b). © 2011 Wiley Periodicals, Inc. Heteroatom Chem 22:579–585, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/hc.20690