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Synfacts 2009(11): 1217-1217
DOI: 10.1055/s-0029-1218092
DOI: 10.1055/s-0029-1218092
Synthesis of Materials and Unnatural Products
© Georg Thieme Verlag
Stuttgart ˙ New York
Synthesis and Cyclization of Photochromic Bisarylindenones
K. Morinaka, T. Ubukata, Y. Yokoyama*
Yokohama National University, Japan
Further Information
Publication History
Publication Date:
22 October 2009 (online)

Significance
Diarylethenes are an important and well-established class of thermally irreversible photochromic compounds. The authors show that they can diversify the properties of a photochrome by annulating the central double bond to an easily modifiable functional group. Open photochromes 3 O and 4 O were synthesized in one step from the corresponding symmetrical diarylacetylenes through a Pd-catalyzed ring-closing reaction with 2-methoxycarbonylphenylboronic acid. A third photochrome, 5 O, was generated by acetalization of 3 O with 1,2-ethanediol.