Journal
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
Volume 89, Issue 3, Pages 296-307Publisher
CHEMICAL SOC JAPAN
DOI: 10.1246/bcsj.20150242
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Funding
- Hayashi Memorial Foundation for Female Natural Science
- Japan Society for the Promotion of Science (JSPS) [24685005]
- Japan Science and Technology Agency (JST) PRESTO program
- Grants-in-Aid for Scientific Research [24685005] Funding Source: KAKEN
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Femtochemistry began from the observation of transition states (TSs) in gas-phase photoreactions. Later developments in visible ultrashort laser pulses enabled visualization of real-time changes in the molecular vibrational modes during photo reactions, including those in the liquid phase. However, TSs in thermal reactions could still not be studied, because the conventional femtosecond laser pulse cannot trigger chemical reactions in the electronic ground state. In the present work, a visible ultrashort laser pulse was used to cause an induced Raman process, whereby Raman active molecular vibrational modes were excited in the electronic ground states, which triggers the reaction induced by coherent molecular vibrational excitation in the electronic ground state just after photo excitation. Using the reaction by coherent molecular vibration, we have successfully observed the TSs in a thermal reaction, thermal Claisen rearrangement.
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