Abstract
AbstractThermally reversible novel photochromic 4,5‐ and 6,7‐dihydroindoles possessing a hexafluoropropano‐bridge, a spiro‐adamantane moiety and a phenyl group were synthesized and their photochemical forward as well as thermal back reactions were investigated. While the open coloured form of 4,5‐dihydroindole had an absorption maximum at 417 nm in toluene, that of 6,7‐dihydroindole at 553 nm. Although the thermal back reaction of the former took about 2 h at r.t., that of the latter completed within a few minutes. Copyright © 2007 John Wiley & Sons, Ltd.
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