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The cyclobutanes obtained on photosensitized cyclo-addition of indene and acrylonitrile have been reinvestigated and the structures formerly assigned (1) have been unambiguously confirmed. The photo-addition of indene and cyanoacetylene has been shown to smoothly afford a single adduct, 7-cyano-2,3-benzobicyclo[3.2.0]hepta-2,6-diene.
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Bowman et al. (1969) studied this question.
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