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Femtosecond Dynamics of Transition States and the Concept of Concertedness: Nitrogen Extrusion of Azomethane Reactions

Diau, Eric W.-G. and Abou-Zied, Osama K. and Scala, Alfred A. and Zewail, Ahmed H. (1998) Femtosecond Dynamics of Transition States and the Concept of Concertedness: Nitrogen Extrusion of Azomethane Reactions. Journal of the American Chemical Society, 120 (13). pp. 3245-3246. ISSN 0002-7863. https://resolver.caltech.edu/CaltechAUTHORS:20160823-144515373

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Abstract

In this communication, we report femtosecond, real-time studies of the nature of the transition states and the concept of concertedness in the nitrogen extrusion reaction of azomethane. Many thermal and photochemical reactions involve the breaking or making of several chemical bonds. Important to the mechanism are the following questions:  How do the two (or more) bonds break? What is the time scale for the elementary steps? What is the true nature of the transition states (TS)? The literature is very rich with discussions on the relationship between the nature of the transition state or structural intermediate and the two extreme descriptions of the reaction, concerted or consecutive, i.e., stepwise (see, e.g., refs 1 and 2). These descriptions are critical to the understanding of the reaction path, the stereochemistry, and the structure of the TS, but in many studies their definition is operational depending on the experimental approach and time scales. With femtosecond resolution, nuclear motions can be studied, allowing for a true definition of concertedness and a clear distinction between TS(s) and intermediate(s).


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http://dx.doi.org/10.1021/ja9743553DOIArticle
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Additional Information:© 1998 American Chemical Society. Received December 31, 1997. Publication Date (Web): March 21, 1998. This work was supported by the Office of Naval Research and the National Science Foundation. A.A.S. thanks Worcester Polytechnic Institute for a sabbatical leave at Caltech.
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Office of Naval Research (ONR)UNSPECIFIED
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Issue or Number:13
Record Number:CaltechAUTHORS:20160823-144515373
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160823-144515373
Official Citation:Femtosecond Dynamics of Transition States and the Concept of Concertedness:  Nitrogen Extrusion of Azomethane Reactions Eric W.-G. Diau, Osama K. Abou-Zied, Alfred A. Scala, and Ahmed H. Zewail Journal of the American Chemical Society 1998 120 (13), 3245-3246 DOI: 10.1021/ja9743553
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69862
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:23 Aug 2016 23:01
Last Modified:03 Oct 2019 10:26

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