DFT Calculations and Synthesis Reveal: Key Intermediates,Omitted Mechanisms,and Unsymmetrical Bimane Products |
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Authors: | Bat-El Oded Yael Diskin-Posner Dr. Vered Marks Prof. Haya Kornweitz Prof. Flavio Grynszpan |
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Affiliation: | 1. Department of Chemical Sciences, Ariel University, Ramat HaGolan 65, Ariel, Israel;2. Department of Chemical Research Support, Weizmann Institute of Science, 234 Herzl Street, Rehovot, Israel |
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Abstract: | Theoretical and experimental mixed approaches are complementary and valuable. Our DFT calculations support the mechanism suggested by Kosower, adding to it a key diaziridine intermediate that determines the relative product distribution of this reaction. Our results are consistent with the formation of the diazoketene intermediate as the rate-limiting step. Based on curve fittings, first or second-order kinetics cannot be ruled out. This may indicate that more than one mechanism is simultaneously at play in this transformation. This unexpected outcome led us to study an alternative cyclopropenone intermediate. Although cyclopropenone is not likely to be formed under thermal conditions, adding it to the reaction mixture results in bimane structures. The most staggering finding from this investigation was the unanticipated generation of the unsymmetrical anti-(Me,Me)(Ph,Ph)bimane. The optimization of this route towards unsymmetrical bimanes will require additional investigation. |
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Keywords: | bimane cyclopropenone DFT mechanism unsymmetric |
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