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Synthesis and Photoisomerization of Diarylcyclobutenes

Raster, P. ; Weiss, Stefan ; Hilt, G. ; König, Burkhard


Symmetrically and unsymmetrically substituted diarylcyclobutenes are synthesized in 20-70% yields from alkyne precursors via cobalt-catalyzed [2+2] cycloadditions. The reactions proceed under mild conditions and provide access to differently substituted diarylethene derivatives. All the diarylcyclobutene products undergo reversible photoisomerization upon irradiation with UV/Vis light. The ...


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