Abstract
Application of the variable oxygen probe to low-temperature crystal data from the series of oxygenated anthracene cycloadducts 10-16, revealed a strong response of the C-OR bond distance in these structures to the electron demand of the OR group. It is believed that this represents the manifestation of pi-sigma negative homohyperconjugation in the ground state. Ab initio molecular orbital calculations on the model system 18 provided further support for this.
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