Abstract
Secondary α-deuterium kinetic isotope effects confirm that [2+4] cycloaddition between (E)-2-phenylnitroethene and cyclopentadiene occurs in concerted manner, on both the pathway leading to 6-endo-phenyl-5-exo-nitronorbornene and the pathway leading to the corresponding 6-exo-phenyl-5-endo-nitro isomer. According to Hammond terminology the transition states on competitive pathways should be considered in terms of symmetrical early states.
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Generous allocation of computing time by the regional computer center “Cyfronet” in Cracow (grant MNiI/SGI2800/PK/053/2003) and financial support from the Polish Ministry of Science and Higher Education (grant C2/263/DS/2008) are gratefully acknowledged.
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Kwiatkowska, M., Jasiński, R., Mikulska, M. et al. Secondary α-deuterium kinetic isotope effects in [2+4] cycloaddition of (E)-2-phenylnitroethene to cyclopentadiene. Monatsh Chem 141, 545–548 (2010). https://doi.org/10.1007/s00706-010-0292-6
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DOI: https://doi.org/10.1007/s00706-010-0292-6