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Fluorescent Dyes with Large Stokes Shifts – a Simple Synthesis of <2,2'-Bipyridine>-3,3′-diol
<2,2'-Bipyridine>-3,3′-diol (4) is obtained in one step from furoin (8) by Zincke rearrangement in 32percent yield.The fluorescence quantum yield of the dye is 50percent in chloroform – absorption and fluorescence spectra are completely separated (TZ = 1011).The large Stokes shift is caused by a proton transfer according to the Foerster mechanism.
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Benzofuran – Wikipedia,
Benzofuran | C8H911O – PubChem