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Photo-reactions initiated by triplet sensitized excitation of 1,2,3,5-exo-6-pentamethyl- 4-methylene-bicyclo[3.1.0]hex-2-ene (exo-1) and 1,2,3,5-endo-6-pentamethyl-4-methylenebicyclo[3.1.0]hex-2-ene (endo-1) are studied qualitatively and quantitatively. It is demonstrated, that - in contrast to the molecular rearrangement to 1,2,3,4,6-pentamethyl- 5-methylene-cyclohexa-1,3-diene following singlet excitation - under triplet excitation exclusively reversible erro-endo-isomerization occurs.

zeitschrift für naturforschung b

Ein Beitrag zum Mechanismus der triplett- sensibilisierten Photoisomerisierung des Homofulven-Systems / On the Mechanism of the Triplet Sensitized Photo-Isomerization of the Homofulvene System