Pyridyl-substituted Cyclobutanes via Photodimerisation of Azastilbenes
Mono- and diazastilbenes A1 - A9 as well as their mono- and dihydro- or -alkyl quaternary salts are irradiated (UV).Mono salts are smoothly converted into cyclobutanes C in crystalline state and/or in solution.The free bases A or their bis salts, reacting in solution only, from partly or exclusively different products.Their structures together with the constitutions and configurations of the cyclobutanes A are elucidated.Results from the literature are partly confirmed and partly corrected.
Horner, Michael,Huenig, Siegfried
p. 1183 - 1210
(2007/10/02)
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