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2 239.1548, found 239.1572
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2 239.1548, found 239.1572.
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In a few cases, unsubstituted methylenecyclopropane and other simple derivatives, such as perfluoromethylenecyclopropane, 2,2- difluoromethylenecyclopropane, and methyl 2-chloro-2-cyclopropylidene acetate, have been used in intermolecular [4 + 2] cycloadditions, (20) but to the best of our knowledge there is only one prior report of an intramolecular, high pressure Diels-Alder variant with this strain-activated dienophile
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In a few cases, unsubstituted methylenecyclopropane and other simple derivatives, such as perfluoromethylenecyclopropane, 2,2- difluoromethylenecyclopropane, and methyl 2-chloro-2-cyclopropylidene acetate, have been used in intermolecular [4 + 2] cycloadditions, (20) but to the best of our knowledge there is only one prior report of an intramolecular, high pressure Diels-Alder variant with this strain-activated dienophile: Heiner, T.; Kozhushkov, S. I.; Noltemeyer, M.; Haumann, T.; Boese, R.; De Meijere, A. Tetrahedron 1996, 52, 12185
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