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Synthesis and photochromic properties of tricarbonylchromium complexes of 2 H ‐η 6 ‐benzochromenes
Author(s) -
Hannesschlager Patrick,
Brun Pierre
Publication year - 2000
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/1099-0739(200007)14:7<371::aid-aoc11>3.0.co;2-j
Subject(s) - chemistry , regioselectivity , photochromism , chromium , lewis acids and bases , polymer chemistry , organic chemistry , catalysis
Although in the 2 H ‐chromene (benzopyran) series complexation with tricarbonylchromium, under thermal conditions, is totally regioselective, in the naphthopyran series the same reaction cannot be observed. We show here that with tricarbonyl(trispyridine)chromium as complexing agent, in the presence of Lewis acid, complexation of naphthopyrans can be achieved and is totally regioselective. The complexes formed are photochromic compounds, and their thermal bleaching kinetic constants are reduced as compared with the non‐complexed homologous compound. Copyright © 2000 John Wiley & Sons, Ltd.