• Title/Summary/Keyword: Cyanohydrins

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Cyanogenic glycosides : Alternative insecticides?

  • Park, Dong-Sik;Coats, Joel R.
    • The Korean Journal of Pesticide Science
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    • v.6 no.2
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    • pp.51-57
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    • 2002
  • Cyanogenic glycosides are secondary plant metabolites that are known as plant defense chemicals. They are found in cassava, bamboo, flax, and other plants. In this paper, the role of cyanogenic glycosides, their characteristics, and their interactions with insects are discussed. Previous and current research in our laboratory found that several natural and synthetic cyanohydrins were effective against stored-product insects as fumigants. Due to their insecticidal activity to insects, cyanohydrins can be used as an alternative fumigant and also as soil fumigants. Risk assessment, however, should be done to account for possible environmental problems, non-target wildlife effects, and human health effects.

Asymmetric Cyanosilylation of Aldehydes by Chiral Ti-TADDOL Complex

  • Kim, Sung-Soo;Kwak, Ju-Myung;Rajagopal, Gurusamy
    • Bulletin of the Korean Chemical Society
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    • v.27 no.10
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    • pp.1638-1640
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    • 2006
  • A variety of chiral cyanohydrins were readily prepared from aldehydes with TMSCN under the influence of chiral titanium complex formed in situ from $Ti(O^iPr)_4$/TADDOL(I) in the presence of $Ph_3PO$ as additive. The double activation method produces trimethylsilylethers in excellent yield (95%) with moderate enantiomeric excess.

Cyanosilylation of Carbonyl Compounds Catalyzed by Potassium L-Aspartate

  • George, Soney C.;Kim, Sung-Soo;Kim, Ho-Sub
    • Bulletin of the Korean Chemical Society
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    • v.28 no.12
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    • pp.2431-2434
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    • 2007
  • Potassium L-aspartate has been used as a catalyst for the cyanosilylation of carbonyl compounds producing corresponding cyanohydrin trimethylsilyl ethers in excellent yield of up to 98%. Although the catalyst is chiral, the enantioselectivities observed are generally poor except for one case, α-naphthaldehyde, 89% ee.

Solvent-free Cyanosilylation of Carbonyl Compounds Catalyzed by NbCl5

  • Georgea, Soney C.;Kim, Sung-Soo
    • Bulletin of the Korean Chemical Society
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    • v.28 no.7
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    • pp.1167-1170
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    • 2007
  • A simple and convenient method for the addition of TMSCN to carbonyl compounds is described. NbCl5 is found to possess a strong Lewis acid property to transform carbonyl compounds smoothly to the corresponding cyanosilylether in high yields (up to 99 %) in solvent- free conditions.