Photoreactivity of quinoline derivatives. Part 2. Photodimers of trans-4-styrylbenzo[h]quinoline

Abstract
The solution-phase photochemistry of trans-4-styrylbenzo[h]quinoline (1) was reinvestigated with the aim of obtaining more detailed information about the photodimerization reaction. Four new isomeric (benzoquinolyl)-diphenylcyclobutanes (5)–(8) were isolated in addition to the previously described cyclobutane derivative (4). Mass and 1H n.m.r. spectra provided valuable information about the structures, configurations, and conformations of these compounds. The effects of monomer concentration, irradiation time, and the presence of oxygen are briefly discussed with a view to preparative applications of the photodimerization.

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