Abstract
A new unsymmetrical bisspiropyran was synthesized on the basis of 2,4-dihydroxyisophthalic aldehyde with naphthoxazinone and indoline fragments in the structure. The structure of the obtained compound was proved by the data from 1 H NMR and IR spectroscopy and X-ray crystallographic analysis. The photochromic characteristics of the obtained compound were investigated. It was established by means of the data from B3LYP/6-31G** quantum-chemical calculations that irradiation of a solution of the obtained biphotochrome with unfiltered light leads to opening of both pyran fragments. This is the first corroborated example of the twofold cleavage of C spiro -O bonds for compounds of this class.
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