Abstract
The cycloaddition reaction mechanism between interstellar molecules, ketenimine and methyleneimine, has been systematically investigated employing the second-order Møller-Plesset perturbation theory (MP2) method in order to better understand the reactivity of nitrogenous cumulene ketenimine with the C =N double bond compound methyleneimine. Geometry optimizations and vibrational analyses have been performed for the stationary points on the potential energy surfaces of the system. Calculations show that five-membered cyclic carbene intermediates could be produced through pericyclic reaction processes between ketenimine and methyleneimine. Through the subsequent hydrogen transfer processes, carbene intermediates can be isomerized to the pyrazole and imidazole compounds, respectively. The present study is helpful to understand the formation of prebiotic species in interstellar space.
The cycloaddition reaction mechanism between interstellar molecules, ketenimine and methyleneimine, has been systematically investigated theoretically. The products of this reaction are pyrazole and imidazole compounds, respectively.
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Acknowledgements
This work is supported by NSFC (21003082, 21303093, 21577076, 21403088), the NSF of Shandong Province (ZR2014BM020), and the project of Shandong Province Higher Educational Science and Technology Program (J13LM06). The State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences (KF2013-05) are also acknowledged.
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Atomic coordinates and other data for the molecules are available at www.ias.ac.in/chemsci.
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WANG, N., TAN, X., WANG, W. et al. Theoretical insights into the cycloaddition reaction mechanism between ketenimine and methyleneimine: An alternative approach to the formation of pyrazole and imidazole. J Chem Sci 128, 279–285 (2016). https://doi.org/10.1007/s12039-015-1028-2
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DOI: https://doi.org/10.1007/s12039-015-1028-2