Posts Tagged ‘G/RT’

Chemistry in an attosecond.

Friday, November 4th, 2011
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An attosecond is 10-18s. The chemistry that takes place on this timescale is called electron dynamics. For example, it is the time taken for an electron to traverse the 1s orbit in a hydrogen atom. And chemists are starting to manipulate electrons (and hence chemistry) on this timescale; for example a recent article (DOI: 10.1021/ja206193t) describes how to control the electrons in benzene using attosecond laser pulses.

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Rate enhancement of the Diels-Alder reaction inside a cavity

Saturday, October 30th, 2010
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Reactions in cavities can adopt quite different characteristics from those in solvents. Thus first example of the catalysis of the Diels-Alder reaction inside an organic scaffold was reported by Endo, Koike, Sawaki, Hayashida, Masuda, and Aoyama[1], where the reaction shown below is speeded up very greatly in the presence of a crystalline lattice of the anthracene derivative shown below.

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References

  1. K. Endo, T. Koike, T. Sawaki, O. Hayashida, H. Masuda, and Y. Aoyama, "Catalysis by Organic Solids. Stereoselective Diels−Alder Reactions Promoted by Microporous Molecular Crystals Having an Extensive Hydrogen-Bonded Network", Journal of the American Chemical Society, vol. 119, pp. 4117-4122, 1997. http://dx.doi.org/10.1021/ja964198s