Photorearrangements in spiro-conjoined cyclohexa-2,5-dien-1-one |
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| Authors: | Masaya SuzukiKazunori Imai Hidetsugu WakabayashiAtsuko Arita Kohei JohmotoHidehiro Uekusa Keiji Kobayashi |
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| Affiliation: | a Department of Chemistry, Graduate School of Science, Josai University, Keyakidai, Sakado, Saitama 350-0295, Japan
b Department of Chemistry and Material Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551, Japan |
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| Abstract: | The unexpected formation of cyclohexa-2,5-dien-1-one (6) spiro-conjoined with a dihydrobenzofuran framework, and the photochemical behavior of this compound in solution as well as in the solid state are described. The photoreaction of 6 in solution affords two rearranged products, one (7) accompanied by the enlargement of the oxygen heterocyclic ring and the other (8) accompanied by cyclopentadienone fragmentation. In the solid state, the former is the sole photoproduct of both solvated and desolvated crystals. The desolvated crystals were obtained as polycrystalline solids by thermal release of solvent molecules, and its structure was elucidated by ab initio determination from X-ray powder diffraction data followed by the Rietveld refinement. |
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| Keywords: | Solid-state photoreaction Photorearrangement Solvate crystal X-ray powder diffraction Rietveld refinement |
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