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Spiropyrans of the phenanthridine series

descriptionPublicationkeyboard_double_arrow_right Article 01 Jun 1974Publisher:Springer Science and Business Media LLCJournal:Chemistry of Heterocyclic Compounds, volume 10, pages 650-653 (issn: 0009-3122, eissn: 1573-8353,

Authors: É. R. Zakhs; L. S. Efros; V. P. Martynova;

doi: 10.1007/bf00480915

Spiropyrans of the phenanthridine series

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Abstract

The relative stabilities of the cyclic and open forms of spiropyrans of the phenanthridine series depend on the character and position of the substituents in the chromene ring and also on the polarity of the media. The structure of the open forms of the spiropyrans is closer to the limiting dipolar structure. The open forms of the carboxy derivatives of the spiropyrans are stabilized in alcohol solutions due to proton transfer to the phenoxide oxygen.

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