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Your search keyword '"Shimizu, Haruka"' showing total 2 results
Start Over Author "Shimizu, Haruka" Topic alkenes
2 results on '"Shimizu, Haruka"'

1. Asymmetric Intramolecular [3 + 2] Cycloaddition Reaction of Acylhydrazones/Olefins Using a Chiral Zirconium Catalyst.

Author

Kobayashi, Shũ, Shimizu, Haruka, Yamashita, Yasuhiro, Ishitani, Haruro, and Kobayashi, Jun

Subjects
*RING formation (Chemistry), *ALKENES
Abstract

Examines the catalytic asymmetric intramolecular cycloaddition of hydrazones/olefins. Molecular structure; Use of chiral zirconium complex as a catalyst; Chemical bonds of the adducts.

Published
2002
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2. Lewis acid-mediated [3+2] cycloaddition between hydrazones and olefins

Author

Kobayashi, Shū, Hirabayashi, Ryoji, Shimizu, Haruka, Ishitani, Haruro, and Yamashita, Yasuhiro

Subjects
*RING formation (Chemistry), *ALKENES, *HYDRAZONES
Abstract

[3+2] Cycloaddition between hydrazones and olefins was accelerated in the presence of a stoichiometric amount of BF3·OEt2 or a catalytic amount of Zr(OTf)4, Hf(OTf)4, or Sc(OTf)3 under mild conditions. The corresponding pyrazolidine derivatives were obtained in moderate to high yields using this novel [3+2] Lewis acid catalysis. [Copyright &y& Elsevier]

Published
2003
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