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Synthesis and photochromic properties of tricarbonylchromium complexes of 2H-η6-benzochromenes

✍ Scribed by Patrick Hannesschlager; Pierre Brun

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
56 KB
Volume
14
Category
Article
ISSN
0268-2605

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✦ Synopsis

Although in the 2H-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.

📜 SIMILAR VOLUMES

Photochromic properties of η6-2H-chromen
Photochromic properties of η6-2H-chromene chromium tricarbonyl complexes
✍ Patrick Hannesschlager; Pierre Brun 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 56 KB 👁 1 views

In the 2H-chromene series, complexation of the aromatic ring with chromium tricarbonyl, under thermal conditions, is totally regioselective even when aromatic substituents are introduced on the pyran ring. The complexation stabilizes the open form of these photochromic compounds and reduces the ther