SEQUENTIAL MULTI-PHOTON PHOTOCHEMISTRY STRUCTURE OF A HIGHLY STRAINED 10-OXAPENTACYCLOUNDECENE DERIVATIVE. J. A. Krause Bauer¹, K. A. Schnapp², R. M. Wilson¹, ¹Chemistry Dept, University of Cincinnati, Cincinnati, OH 45221, ²Chemistry Dept, Northern

Kentucky University, Highland Hts, KY 41099

Unlike most acyclic enones which are observed to give mechanistically simplistic photochemistry, we have examined several sterically congested acyclic enones exhibiting unique photorearrangement reactions. Insights into the mechanistic pathways of this novel photorearrangement will be given.

During the course of the investigation, a highly strained 10-oxapentacyclo-[5,3,1,0^5,7,0,^8,9,0^2,11] undecene derivative was synthesized under high-intensity laser-jet conditions. The structure of this unusual species as well as other photoproducts will be presented.