Theoretical and experimental study of [2+2]-photoclosure approachtoward [7]-prismane analogs

All 39 possible intramolecular [2+2]-photocycloaddition pathways toward [7]-prismane and its homo, seco, homo-seco, bishomo and bishomo-seco analogs have been explored by MM2 .calculations. Fourteen of these are predicted to offer reasonable chance of success. Experimental support for a few of these is provided