• Title/Summary/Keyword: Ketones.

검색결과 524건 처리시간 0.024초

Fragrance and Metabolite Components of Flowers from Korean Native Apocynum lancifolium Russanov

  • Kim, JoHoon;Lee, JaeMyun;Park, YeGun;Ann, SeoungWon;Baik, JungAe
    • 한국환경과학회지
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    • 제30권10호
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    • pp.879-889
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    • 2021

  • This study characterizes the volatile aromatic and metabolite components of domestic native Apocynum lancifolium blossom. The accurate characterization of fragrances collected from the blossom was carried out using gas chromatography-mass. A total of 70 chemical components were identified, including ketones of acetophenone (29.22%), phenylethyl alcohol (10.54%), methyl-benzenemethanol (8.43%), benzyl alcohol (7.97%), natural bicyclic sesquiterpene types of caryophyllene (6.08%), gurjunene (6.20%), humulene (1.90%), and ocimene (1.04%). Overall, the content of ketones, alcohols, and terpenes was higher than that of others. The major metabolite components were pentanoic acid, malic acid, fructofuranoside, quinic acid, tagatose, sorbose, galactose, inositol, galactaric acid, glucopyranoside, and octadecenoic acid.

  • https://doi.org/10.5322/JESI.2021.30.10.879 인용 PDF KSCI

Addition Compounds of Alkali Metal Hydrides. 32. A Comparison Study of Chiral Trialkylborohydrides and Chiral Dialkylmonoalkoxyborohydrides for the Asymmetric Reduction of Prochiral Ketones: The Effect of Comparable Chiral Alkyl and Alkoxy Groups on Asymmetric Industion$^\dag$

  • Brow, Hervert C.;Park, Won-Suh;Cho, Byung-Tae
    • Bulletin of the Korean Chemical Society
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    • 제8권4호
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    • pp.276-280
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    • 1987

  • Several chiral potassium B-alkyl-9-boratabicyclo[3.3.1]nonanes $(K\; B-R^*-9-BBNH)$ and potassium B-alkoxy-9-boratabicyclo[3.3.1]nonanes $(K \;B-OR^*-9-BBNH)$ were synthesized by treatment of the corresponding trialkylboranes and dialkylmonoalkoxyboranes with a small excess of potassium hydride. The chiral B-alkoxy derivatives generally reduce representative ketones, such as acetophenone and 3-methyl-2-butanone, with greater optical induction than the corresponding B-alkyl derivatives, suggesting the involvement of the oxygen atom in the control process for asymmetric synthesis.

  • https://doi.org/10.5012/bkcs.1987.8.4.276 인용 PDF

Raction of Thexylbromoborane-Methyl Sulfide in Methylene Chloride with Selected Organic Compounds Containing Representative Functional Groups$^\dag$

  • Cha, Jin-Soon;Kim, Jin-Euog;Oh, Se-Yeon
    • Bulletin of the Korean Chemical Society
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    • 제8권4호
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    • pp.313-318
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    • 1987

  • The approximate rate and stoichiometry of the reaction of excess Thexylbromoborane-methyl sulfide, $ThxBHBr{\cdot}SMe_2,$ with selected organic compounds containing representative functional groups under standardized conditions (methylene chloride, $0^{\circ}C)$ were studied in order to characterize the reducing characteristics of the reagent for selective reductions. The selectivity of the reagent was also compared to the selectivity of thexylchloroborane-methyl sulfide. Thexylbromoborane appears to be a much milder and hence more selective reducing agent than thexylchloroborane. The reagent tolerates many organic functionalities. Thus, the reagent shows very little reactivity or no reactivity toward acid chlorides, esters, epoxides, amides, nitro compounds including simple olefins. However, this reagent can reduce aldehydes, ketones, carboxylic acids, nitriles, and sulfoxides. Especially the reagent reduces carboxylic acids including ${\alpha},{\beta}$ -unsaturated ones and nitriles to the corresponding aldehydes. In addition to that, thexylbromoborane shows good stereoselectivity toward cyclic ketones, much better than the chloro-derivative.

  • https://doi.org/10.5012/bkcs.1987.8.4.313 인용 PDF

초피 정유의 저장 중 향기성분 변화 (Compositional Changes in Essential Oil of Zanthoxylum piperitum A.P. DC. During Storage)

  • 정미숙
    • 한국식생활문화학회지
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    • 제21권4호
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    • pp.433-438
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    • 2006

  • Compositional changes In essential oil of Zanthoxylum piperitum A.P. DC. were investigated under six different storage conditions for 3 months. Essential oil from Zanthoxylum piperitum was collected by steam distillation method and analyzed by gas chromatography-mass selective detector (GC-MSD). Forty-one volatile compounds, consisting of 12 hydrocarbons, 11 alcohols, 8 aldehydes, 3 oxides, 3 esters, 3 ketones and 1 acid were identified from the fresh essential oil of Zanthoxylum piperitum. In essential oils, compositional changes occurred in particularly monoterpene hydrocarbons. Total levels of ketones, esters, oxides and alcohols increased during storage. Moreover, aerobic condition caused decrease in a few constituents duringstorage even at low temperature.

  • https://doi.org/10.7318/KJFC.2006.21.4.433 인용 PDF KSCI