• Title, Summary, Keyword: Phenol derivatives

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EFFECTS OF PHENOL DERIVATIVES ON BACTERIAL GROWTH (효소조중의 세균성장에 미치는 Phenol 유도분 영향 유도)

  • LEE Kyung-Hee;LEE Keun-Tai
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.11 no.4
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    • pp.213-217
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    • 1978
  • Henri-Michaelis-Menten model for predicting the behavior of culture of Brevibacterium flavum under carbon limiting condition has been evaluated on a chemostat growing in the presence of the phenol derivatives: guaiacol, o-vanillin and vanillin. It is found that Henri-Michaelis-Menten model could be applicable to the evaluation of the growth rate of cells in the phenol derivatives. The marked enhancing abilities of the cells treated by the phenol derivatives during fermentation were ascribed to the formation of charge-transfer complex between the phenol-derivatives and oxygen which supplies oxygen effectively to the fermentation system.

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Determination of Derivatives of Phenol with a Modified Electrode Containing β-Cyclodextrin

  • 김신희;원미숙;심윤보
    • Bulletin of the Korean Chemical Society
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    • v.17 no.4
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    • pp.342-347
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    • 1996
  • Voltammetric determination of phenol derivatives, such as phenol, o-, m-, and p-cresols was studied with a β-Cyclodextrin (β-CD) modified-carbon paste electrode composing of the graphite powder and Nujol oil. Phenol derivatives were chemically deposited via the complex formation with β-CD by immersing the CME into a sample solution. The resulting surfaces were characterized with cyclic and differential pulse voltammetry. Treating the CME with 1 M nitric acid for five sec after a measurement could regenerate the electrode surface. Linear sweep and differential pulse voltammograms were recorded for the above system to optimize the experimental parameters for analysing the phenol derivatives. In this case, the detection limit for phenols was 5.0×10-7M for 25 min of the deposition time with differential pulse voltammetry. The relative standard deviation was ±5.2% of 3.0×10-6M (four repetitions). The interference effect of the following organic compounds was also investigated; Bezoic acid, hippuric acid, o-, m-, and p-methylhippuric acid. Adding the organic compounds into the sample solution reduces the peak current of the phenols to about 25%.

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The “Trivial” Mechanism for the Photo-Fries Reaction of Phenyl Acetate and Biphenylyl Acetates

  • Yun, Hyo Jeong;Go, Seong Hye;Go, Mi Gyeong;Choe, U Gi
    • Bulletin of the Korean Chemical Society
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    • v.21 no.9
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    • pp.901-904
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    • 2000
  • The mechanism for the photo-Fries rearrangement of phenyl acetate andbiphenylyl acetates were reinvestigat-ed in phenol (or phenol derivatives) containing media. The results showed that the phenol (or phenol deriva-tives) which is the most common by-product of Fries reaction reacts with acyl radical togive Fries-product. These phenol (or phenol derivatives) contributions to the Fries-products were suggested as the Trivial mecha-nism for the photo-Fries reaction.

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Thermodynamic Study on the Solubilization of p-Halogenated Phenol Derivatives in TTAB Solution (TTAB 수용액에서 p-할로겐화 페놀유도체들의 가용화에 대한 열역학적 연구)

  • Lee, Byung-Hwan
    • Applied Chemistry for Engineering
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    • v.25 no.1
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    • pp.20-26
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    • 2014
  • The interaction of p-halogenated phenol derivatives with the micellar system of tetradecyltrimethylammonium bromide (TTAB) was studied by the UV/Vis spectrophotometric method. Effects of substituents, additives, and temperatures on the solubilization of phenol derivatives have been measured. The results show that all the values of ${\Delta}G^o$ and ${\Delta}H^o$ were negative and the values of ${\Delta}S^o$ were positive for all phenol derivatives within the measured temperature range. The calculated thermodynamic parameters depended on the size, the electro-negativity, and the hydrophobic property of halogen substituents. The addition of n-butanol results in the decrement in tthe Ks values and the addition of NaCl caused the increment in the Ks values for all the phenol derivatives. From these changes we can postulate that the solubilization sites of the phenol derivatives in the micelle depend severely on properties of the halogen-substituent.

Clean Reduction of $\alpha,\beta$-Unsaturated Carboxylic Acid Derviatives to the Saturated Derivatives by Potassium Triphenylborohydride in the Presence of Phenol

  • Park, Soo-Bong;Kim, Kwan-Eung;Yoon, Nung-Min
    • Bulletin of the Korean Chemical Society
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    • v.9 no.6
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    • pp.352-355
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    • 1988
  • ${\alpha},{\beta}$-unsaturated carboxylic acid derivatives such as esters, amides, and nitriles are readily reduced to the corresponding saturated derivatives by potassium triphenylborohydride, $KPh_3BH$, in the presence of phenol, a quenching agent, in excellent yields.

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Preparation of Polyenaryloxynitriles from Dicyanovinyl Chloride and Diphenol Derivatives in the Presence of DABCO

  • Geum, Ne Ri;Gong, Myeong Seon
    • Bulletin of the Korean Chemical Society
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    • v.21 no.11
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    • pp.1111-1114
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    • 2000
  • The kinetic study of the enaryloxynitriles via the nucleophilic vinylic substitution reaction of various phenol derivatives with 1-chloro-1-phenyl-2,2-dicyanoethene (1) was conducted in the presence of 1,4-diazabicyclo[2,2,2]octane (DABCO). Nucleo philic vinylic substitution of phenol derivatives with electrophilic olefins carrying sluggish leaving group involves a third-order reaction. The reaction was applied to solution polymerization of diphenol derivatives with p-bis(1-chrolo-2,2-dicyanovinyl)benzene (2), which yielded various polyenaryloxynitriles with moderate molecular weight.

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THE KINETIC STUDIES OF GLUCONIC ACID FERMENTATION (PART 1) Effect of Phenol and Catechol Derivatives on Oxygen Transfer in the Fermentation (Gluconic acid의 발효에 관한 연구(제1보) 발효조중 산소이동에 미치는 Phenol 유도분 및 Catechol 유도분의 영향)

  • LEE Keun-Tai;LEE Kyung-Hee
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.11 no.4
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    • pp.205-211
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    • 1978
  • The effect of phenol derivatives (guaiacol, vanillin, o-vanillin, eugenol) and catechol derivatives (pyrogallol, resoicinol) to enhance the volumetric oxygen transfer coefficient, in the aerobic fermentation was studies. Guaiacol, vanillin, o-vanillin, pyrogallol and resorcinol revealed to enchance the volumetric oxygen transfer coefficient, and eugenol had no such ability. The enhancement of the oxygen transfer ability is probably due to the formation of the charge transfer complex by the derivatives and oxygen molecules.

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Synthesis of New 4-(tert-Octyl)phenol Derivatives and Their Anticancer Activity against Human Prostate and Lung Cancer Cell Lines

  • Che, Haiyan;Fang, Yuanying;Gurung, Santosh K.;Luo, Jun;Yoon, Deok Hyo;Sung, Gi-Ho;Kim, Tae Woong;Park, Haeil
    • Bulletin of the Korean Chemical Society
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    • v.35 no.7
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    • pp.2038-2042
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    • 2014
  • 4-(tert-Octyl)phenol derivatives bearing the D-mannitol substructure (6a, 6b, 7) were prepared from $\small{D}$-mannitol and evaluated their anticancer activity against human lung (A549) and prostate (Lncap, Du145, PC3) cancer cell lines. Among derivatives tested, the bis(tert-octyl)phenoxy compound 7 exhibited strongest proliferation inhibitory activities against human cancer cell lines tested, especially high sensitivity to human Du145 prostate cancer cells ($IC_{50}=7.3{\mu}M$).

Synthesis and Analgesic-antiinflammatory Activity of Cinmetacin Derivatives (Cinmetacin유도체의 합성과 진통항염활성)

  • 임채욱;이종민;유재학;이현수;임철부
    • YAKHAK HOEJI
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    • v.45 no.1
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    • pp.1-6
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    • 2001
  • Nine cinmetacin derivatives as potential nonsteroidal analgesic and antiinflammatory compounds were prepared and their analgesic-antiinflammatory activity was compared with cinmetacin. Salicylic acid and phenols were reacted with dicyclohexyl carbodiimide (DCC) to give phenol salicylates (1-4). Cinmetacin was treated with DCC and phenol derivatives to yield cinmetacin esters (5-13). Compounds (5, 7, 8, 10, 12, and 13) showed stronger analgesic activity than cinmetacin, but only compound (5) showed comparable antiinflammatory activity to cinmetacin.

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