• 제목/요약/키워드: alkyne

검색결과 61건 처리시간 0.023초

Synthesis of Dendrimer Containing Dialkylated-fluorene Unit as a Core Chromophore via Click Chemistry

  • Han, Seung-Choul;Jin, Sung-Ho;Lee, Jae-Wook
    • Bulletin of the Korean Chemical Society
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    • 제33권1호
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    • pp.137-142
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    • 2012

  • The convergent synthetic strategy for the emissive dendrimers having the chromophore at core via the coppercatalyzed 1,3-dipolar cycloaddition reaction between alkyne and azide was described. 2,7-Diazido-9,9-dioctyl-9H-fluorene, designed to serve as the core in dendrimer, was stitched with the alkyne-functionalized Frechettype and PAMAM dendrons by the click chemistry leading to the formation of the corresponding fluorescent dendrimers in high yields. The preliminary photoluminescence studies indicated that 2,7-diazido-9,9-dioctyl-9H-fluorene showed no fluorescence due to the quenching effect from the electron-rich ${\alpha}$-nitrogen of the azido group but the dendrimers fluoresced due to the elimination of the quenching through the formation of the triazole ring.

  • https://doi.org/10.5012/bkcs.2012.33.1.137 인용 PDF KSCI

Convergent Synthesis of PAMAM-like Dendrimers from Azide-functionalized PAMAM Dendrons

  • Lee, Jae-Wook;Kim, Jung-Hwan;Kim, Byung-Ku;Kim, Ji-Hyeon;Shin, Won-Suk;Jin, Sung-Ho;Kim, Myung-hak
    • Bulletin of the Korean Chemical Society
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    • 제27권11호
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    • pp.1795-1800
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    • 2006

  • The convergent synthesis of symmetric PAMAM-like dendrimers from azide-functionalized poly(amido- amine) (PAMAM) dendrons and two different multi-alkynes was investigated. The stitching method was based on the click chemistry protocol, i.e., the copper-catalyzed cycloaddition reaction between an alkyne and an azide.

  • https://doi.org/10.5012/bkcs.2006.27.11.1795 인용 PDF KSCI

Molecular Orbital Study of Bonding and Stability on Rh(Ⅰ)-Alkyne Isomers

  • 강성권;송진수;문정현;윤석성
    • Bulletin of the Korean Chemical Society
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    • 제17권12호
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    • pp.1149-1153
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    • 1996

  • Ab initio and extended Huckel calculations were carried out on the isomers of trans-RhCl(η2-C2H2)(PH3)2 (1). Due to π-back donation in 1 complex, the rotational energy barrier of alkyne ligand is computed to be in the range of 18.6-25.2 kcal/mol at MP4 levels. The optimized hydrido-alkynyl complex (2) at ab initio level has the distorted trigonal bipyramidal structure. Vinylidene complex (3) is computed to be more stable than 1 complex by 17.1 kcal/mol at MP4//MP2 level. The stabilities of isomers show similar trend at the various level calculations, that is, EHT, MP4//HF, and MP4//MP2 levels. The optimized geometries at ab initio level are in reasonable agreement with experimental data. A detailed account of the bonding in each isomers (1-3) have been carried out in terms of orbital analyses.

  • https://doi.org/10.5012/bkcs.1996.17.12.1149 인용 PDF

Diastereomeric Strain-Promoted Azide-Alkyne Cycloaddition: determination of configuration with the 2D NMR techniques

  • Hye Jin Jeong
    • 한국자기공명학회논문지
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    • 제27권2호
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    • pp.10-15
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    • 2023

  • The Strain-Promoted Azide-Alkyne Cycloaddition (SPAAC) is a powerful method for synthesizing triazoles, even under physiological conditions, without a copper catalyst. This technique provides an efficient means for everyone to synthesize complex triazole derivatives rapidly. In order to investigate the configuration of triazole derivatives using bicyclo[6.1.0.]-nonyne (BCN) and chiral azide, it is necessary to employ the 2D NMR. Both 1D and 2D NMR (COSY, HSQC, 15N HMBC) are used to analyze the complex triazole product containing cyclooctyne, a diastereomeric product. The stereometric difference of the proton bonded to the same carbon is determined through the HSQC assignment. The intriguing splitting pattern of carbon resonances also reveals their diastereomeric configuration and will aid in further research based on physiological knowledge.

  • https://doi.org/10.6564/JKMRS.2023.27.2.010 인용 PDF