• Title/Summary/Keyword: New technology

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Gossypiline, a New Lignan from Jatropha gossypifolia

  • Das, R.;Das, B.;Kashinatham, A.
    • Natural Product Sciences
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    • v.4 no.4
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    • pp.238-240
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    • 1998

  • A new lignan, gossypiline (1) has been isolated from the aerial parts of Jatropha gossypifolia. The structure of 1 was established from its spectral data. The conversion of isogadain, a known lignan, to 1 confirmed the structure as well as the stereochemistry of 1.

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Synthesis and herbicidal activity of new benzenesulfonylurea derivatives possessing ${\alpha}$-diketone or ${\alpha}$-keto ester moiety (${\alpha}$-Diketone 또는 ${\alpha}$-keto ester기를 포함하는 신규 벤젠술포닐우레아 유도체의 합성 및 제초활성)

  • Ko, Young-Kwan;Chang, Hae-Sung;Ryu, Jae-Wook;Woo, Jae-Chun;Koo, Dong-Wan;Kim, Jin-Seog;Kim, Dae-Whang
    • The Korean Journal of Pesticide Science
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    • v.2 no.3
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    • pp.147-150
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    • 1998

  • A series of new benzenesuIfonylurea derivatives possessing ${\alpha}$-diketone or ${\alpha}$-keto ester moiety as an ortho substituent were synthesized by employing new methodology starting from 2-bromophenyl methoxymethyl sulfide and some of them were found to have good herbicidal activity at foliar application.

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New Tactics for Stereospecificity in Metallocene-based Olefin Polymerization

  • Kim, Seong-Kyun;Park, Sung-Jin;Kim, Hwa-Kyu;Yoon, Seung-Woong;Lee, Jun-Seong;Park, Myung-Hwan;Do, Young-Kyu
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.221-221
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    • 2006

  • The stereochemical control in polypropylenes and styrene-ethylene copolymers based on homogeneous single-site polymerization catalysts has received great attention since the stereocpecificity is one of the key factors in tailoring the polymer properties. Thus, we have developed new tactics for isospecificity in propylene polymerization with the unbridged metallocenebased systems and syndiospecific styrene-styrene sequence in styrene-ethylene copolymerization with the group 4 metallocene system. Brief details of the synthesis, structures and the polymerization behavior of a set of new metallocene catalysts will be presented.

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