Abstract
The reaction mechanism between cyclopropenylidene and azacyclopropane has been systematically investigated by employing the second-order Møller–Plesset perturbation theory (MP2) method to better understand the reactivity of cyclopropenylidene with the three-membered ring compound azacyclopropane. Geometry optimization and vibrational analysis have been performed for the stationary points on the potential energy surfaces of the system. It was found that, in the first step of this reaction, cyclopropenylidene can insert into azacyclopropane at its C–N bond to form a spiro intermediate. In the second, ring-opening step, a carbene intermediate is formed. Through the following two H-transfer steps, the carbene intermediate forms an allene [pathway (1)] or alkyne [pathway (2)] product. From the kinetic viewpoint, the pathway with alkyne formation is easier than that with allene formation. From the thermodynamic viewpoint, the allene is the dominant product because the reaction is exothermic (287.8 kJ mol−1).
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Acknowledgments
This work is supported by NSFC (21003082, 21303093), the project of Shandong Province Higher Educational Science and Technology Program (J13LM06, J13LM53), and the State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences (KF2013-05).
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Tan, X., Wang, W., Jing, Y. et al. Theoretical study on the reaction mechanism of cyclopropenylidene with azacyclopropane: ring expansion process. Monatsh Chem 145, 1109–1115 (2014). https://doi.org/10.1007/s00706-014-1174-0
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DOI: https://doi.org/10.1007/s00706-014-1174-0