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In both α-positions relative to the spiro-C-atom substituted spirobipyrans have the expected spiropyran structure, in spite of their exceptional behaviour that their pyrylium salts can not be isolated generally. Strong steric effects are responsible for the instability of those pyrylium salts, as it can be shown by UV- and IR-spectroscopic investigations.

zeitschrift für naturforschung b

Zur Darstellbarkeit von 2.2′-disubstituierten 3.3′ - Spirobi- [3H-naphtho(2.1-b)pyranen] / About the Synthesis of 2,2′-Disubstituted 3,3-Spirobi-[3H-naphtho (2,1-b)pyrans]