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A photochemical study of benzocyclobutenedione is presented using narrow-band excitation and time-dependent spectroscopic measurements. Various photointermediates and the title photoequilibrium are firmly established. The UV/VIS absorption spectra of pure o-benzyne (1) and cyclopentadienylideneketene (4) are given. The results prove that the IR band at 2087 cm-1 previously ascribed to 1 and assigned to the {A figure is presented} vibration is instead the ketene band of 4. © 1990.




Simon, J. G. G., Münzel, N., & Schweig, A. (1990). Matrix isolation photochemistry: photoequilibrium between transient o-benzyne, carbon monoxide and transient cyclopentadienylideneketene in an argon matrix. Chemical Physics Letters, 170(2–3), 187–192. https://doi.org/10.1016/0009-2614(90)87113-6

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