The effect of a sulphur bridge on the photochromic properties of indeno-fused naphthopyrans
authors Coelho, PJ; Salvador, MA; Oliveira, MM; Carvalho, LM
author keywords photochromism; naphthopyrans; spectrokinetics; heterocycles; spiro[thioxanthene-naphthopyrans]
keywords BEHAVIOR
abstract The synthesis of four new 2,2-diphenyl-2H-naphtho[1,2-b]pyrans with a fused indeno group at the f face and a sulphur junction between the 2,2-phenyl groups is described. The photochromic properties in solution of these novel compounds were investigated under continuous irradiation. Compared to known indeno-fused naphthopyrans, these new compounds showed a significant bathochromic shift in the spectra of the open forms, faster ring closure kinetics and an expected decrease in the colourabilities. (C) 2004 Elsevier Ltd. All rights reserved.
issn 0040-4020
year published 2004
volume 60
issue 11
beginning page 2593
ending page 2599
digital object identifier (doi) 10.1016/j.tet.2004.01.034
web of science category Chemistry, Organic
subject category Chemistry
unique article identifier WOS:000220035400016
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