Preparation of 6-benzyloxo-spirobenzopyran-indoline compounds and the evaluation of their optical activities

Substituted derivatives of spiropyran compounds bearing a benzyloxo fraction at the 6-position were prepared by direct Friedel–Crafts acylation. The novel compounds exhibited maximum absorption at 580 nm. According to the activation energy and kinetic rate constants, the Cl and Br derivatives were m...

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Bibliographic Details
Published inDyes and pigments Vol. 78; no. 2; pp. 111 - 116
Main Authors Elizalde, Luis E., de los Santos, Gladys
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.08.2008
Subjects
Benzophenone
Friedel–Crafts acylation
Photochromism
Spiropyrans
Friedel–Crafts acylation
Spiropyrans
Photochromism
Benzophenone
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Summary:Substituted derivatives of spiropyran compounds bearing a benzyloxo fraction at the 6-position were prepared by direct Friedel–Crafts acylation. The novel compounds exhibited maximum absorption at 580 nm. According to the activation energy and kinetic rate constants, the Cl and Br derivatives were more stable in the open form than their analogues which did not contain the benzyloxo fraction.
ISSN:0143-7208
1873-3743
DOI:10.1016/j.dyepig.2007.10.011