Journal
TETRAHEDRON LETTERS
Volume 50, Issue 1, Pages 111-114Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2008.10.098
Keywords
1,2-Dihydroindol-3-one; Robinson ring annulation; Fluorophores; Stokes shift
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Various organic dyes were synthesized from 1,2-dihydroindol-3-one analogue via Robinson ring annulation, which proceeded efficiently using DBU as a base to give the pi-expanded compounds. These compounds exhibited longer Stokes shifts (over 100 nm) than the 1,2-dihydroindol-3-ones (50-80 nm). Emission peaks of the obtained materials covered the 440-640 nm range. (C) 2008 Elsevier Ltd. All rights reserved.
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