• 대한화학회지
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• 제41권2호
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• pp.82-87
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• 1997

다양한 bis(silacyclopentadienyl)aromatic 화합물 합성에 필요한 전구체인 1,4-bis(alkyldichlorosilyl)benzene을 합성하였다. 이 전구체에 1,4-dilithio-1,2,3,4-tetraphenyl-1,3-butadiene을 첨가하여 고리화반응을 시킴으로써 리간드로 또는 안정한 silacyclopentadienyl anion 전구체로 사용될 1,4-bis(1'-alkyl-2',3',4',5'-tetraphenyl-1'-silacyclopentadienyl)benzene을 합성하였다.

• 한국응용과학기술학회지
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• 제11권2호
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• pp.99-103
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• 1994

A stability to the spreading solvent, which is acetonitrile, benzene, chloroform and acetonitrile-benzene(1:1, v/v) of (3-Alkyl benzimidazdium)-TCNQ(1:2) complex was investigated by UV-visible spectrometer and was confirmed stabilized on acetonitrile, acetonitrile-benzene (1:1, v/v) for five hours. Using Ultra pure water as subphase for Langmuir-Blodgett(LB) films, it was achived successively to fabricate the Y-type LB films of (3-Alkyl benzimidazolium)-TCNQ(1:2) complex. For the identification of (3-Alkyl benzimidazolium)-TCNQ(1:2) complex, UV-visible spectra was recorded on HP 8452A spectrometer.

• 약학회지
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• 제53권5호
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• pp.281-285
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• 2009

The retention of solutes in reversed-phase high-performance liquid chromatography depends on their hydrophobicity. Although the retention behaviors of alkyl benzenes have been reported so far, quite a few authors have mentioned the retention behavior of alkyl benzenes with plural hydrophobicity parameters. In this sense, we were interested in the retention behaviors of alkyl benzenes having benzene moiety and increasing alkyl chain. In this study, we therefore investigated the retention behavior of alkyl benzenes in reversed-phase high-performance liquid chromatography in order to obtain information concerning the effects of the aromatic moiety and the carbon chain on the retention mechanism by comparing their capacity factor (k') in relation to the carbon chain length. The eluent acetonitrile ($CH_3CN$) showed high selectivity on alkyl benzenes, showing the high difference of capacity factor (${\Delta}log\;k'$) between toluene and octyl benzene. Indeed, the ${\Delta}log\;k'$ of 80% $CH_3CN$ represented 1.42- and 4.25-times longer than 90% MeOH and 60% THF, respectively. The hydrophobicity parameters, van der Waals volume, bond constant, partition constant, $\pi$-energy effect and enthalpy were evaluated with the capacity factor (k') of alkyl benzenes eluted on 80% CH3CN, 90% MeOH and 60% THF, respectively. The best eluent for predicting retention behavior of alkyl benzenes was 90% MeOH ($R^2$ 0.999). The three parameters, van der Waals volume, bond constant and partition constant were well coincident to log k' by increasing alkyl benzenes. However, $\pi$-energy effect and enthalpy were severely disagreeable. Taken together, van der Waals volume, bond constant and partition constant were a reliable parameters to predict the retention behaviors of alkyl benzenes on reversed-phase column.

• Korean Chemical Engineering Research
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• 제49권1호
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• pp.56-61
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• 2011

Methyl vinyl ether, propyl vinyl ether, isopropyl vinyl ether, butyl vinyl ether 그리고 isobutyl vinyl ether 등의 alkyl vinyl ether는 화학 및 의약산업에서 용매와 합성중간체로 널리 사용된다. 최근 들어 alkyl vinyl ether는 고분자 전해질막 연료 전지에 대한 원료와 셀룰로오스의 염색가공에 선호되나, 공정 및 운전변수의 최적화를 위한 alkyl vinyl ether계의 혼합물성은 극히 일부가 보고되고 있고, propyl vinyl ether(PVE)에 대한 상평형과 물성 데이터는 거의 알려진 바가 없다. 따라서 본 연구는 {PVE + ethanol + benzene} 삼성분계 333.15 K에서 기액평형을 headspace gas chromatography (HSGC)을 이용하여 측정하였고 Wilson, NRTL 및 UNIQUAC 식에 상관시켰다. 또한 삼성분계를 구성하는 혼합물성으로써 {PVE + ethanol}, {ethanol + benzene} 그리고 {PVE + benzene}계에 대한 과잉부피($V^E$) 및 굴절율 편차(${\Delta}R$)를 303.15 K에서 측정하였다. 측정된 이성분계 혼합물성은 Redlich-Kister 다항식을 이용하여 매개변수를 상관시켰으며, 이를 이용하여 Radojkovi 식으로 삼성분계 혼합물성을 예측하였다.

• 한국응용과학기술학회지
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• 제11권1호
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• pp.39-44
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• 1994

A Stability to the Spreading solvents, Which is acetonitrile, dichloromethane, benzene, chloroform and acetonitrile-benzene(1:1, v/v) of (3-Alkyl benzimidazolium)-TCNQ(1:1) Complex was investigated by UV-visible Spectrometer and was confirmed stabilized on acetonitrile, acetonitrilbenzene(1:1, v/v) for five hours. Using Ultra pure water as subphase for Langmuir-Blodgett (LB) Films, it was achived successively to fabricate the Y-type LB films of (3-Alkyl benzimidazolium)-TCNQ(1:1) Complex. For the identification of deposition of (3-Alkyl benzimidazolium)-TCNQ(1:1) Complex, UV-visible spectra was recorded on HP 8452A spectrometer.

• Journal of Pharmaceutical Investigation
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• 제8권3호
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• pp.11-15
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• 1978

The contamination concentrations of the alkyl benzene sulfonate (ABS) pollution in the Han river were investigated at 3 sites from July through september, 1977. The samples were taken on the upper, the middle, and the lower Han river and 5points of each part, respectively. The contamination concentrations of ABS pollution in the river were 0.012 p.p.m of the upper site, 0.206 p.p.m of the middle site, and 0.486 p.p.m of the lower site in average, respectively. Consequently, the contamination concentrations of ABS pollution in the Han river were the highest at the lower site, where is between second Han river bridge and Nan Ji island.

• Bulletin of the Korean Chemical Society
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• 제14권4호
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• pp.481-485
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• 1993

Dialkyl 1-bromobenzene-2,6-diacetates were easily prepared by the carbonylation of the moiety of benzylic bromide in 1-bromo-2,6-bis(bromomethyl)benzene with alcohol in the presence of NaOAc< TEX>${\cdot}$3H$_2$O and a catalytic amount of Co$_2$(CO)$_8$under the atmospheric pressure of carbon monoxide at room temperature in excellent yield. Alkyl 2,6-bis(alkoxymethyl)benzoates were obtained by the carbonylation of the moiety of aryl bromide in 1-bromo-2,6-bis(alkoxymethyl)-benzene, which derived from 1-bromo-2,6-bis(bromomethyl)benzene, alcohol, NaOR, and CH$_3$I under the same conditions. Alkyl 2,6-bis(carboxymethyl)benzoate was also obtained in a trace amount for 24 hrs at room temperature.

• 한국안전학회지
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• 제20권2호
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• pp.44-49
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• 2005

Real-scale experimental study was performed to characterize the surface flame propagating velocity along the OF cable in the underground utility fire. Temperatures of oil filled OF cable and dried OF cable with the diameter of 90mn were measured using thermocouple and data log system. The hexane and alkyl-benzene oil were used as a fire source using the ignition device. As a result while the surface flame propagating velocity of the three cables was $0.06\~0.09cm/s$, the surface flame propagating velocity of the one cable was $0.028\~0.032cm/s$. Therefore, it was found that the surface propagating flame velocity of the three OF cables is $2.1\~2.8times$ faster than that of one OF cable case. The results show that the surface propagating flame velocity became larger as increase of the number of cable, the volume of alkyl-benzene oil in the cable. The characteristics of surface propagating flame velocity in the OF cable can be helpful to fire suppression system in utility.

• Environmental Analysis Health and Toxicology
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• 제15권1_2호
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• pp.39-43
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• 2000

Linear alkyl sulfonates (LAS) constitute a large fraction of the surfactants used in cleaning processes in households, trade and industry Despite the industrial significance and the possible environmental impact of these compounds, the fast and inexpensive determination of LAS concentrations is still a difficult task. In this study, near infrared (NIR) spectroscopy which is a rapid spectroscopic analysis method compared with a traditional analytical method for the measurement of LAS concentration such as HPLC, GC and standard wet chemistry method. NIR spectra of LAS between 0.313 and 25.0% (w/v) in water were utilized to develop a calibration model. The best results (R ＝ 0.998, SEP ＝ 0.244% (w/v)) obtained by using partial least-squares regression with spectral data treatment and 2nd derivatization were comparable to the results (SEC ＝ 0.186% (w/v), SEP ＝ 0.206% (w/v)) obtained by using multiple linear least-squares regression (MLR). However, models based on derivative spectra have no significant advantage with MLR.

• 공업화학
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• 제5권5호
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• pp.795-800
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• 1994

새로운 기능성을 갖는 sodium monoglycerol ${\alpha}$-sulfonated alkanonate류에서 소수성 부분의 알킬기의 탄소수에 따른 세정력을 비교한 결과 $C_{16}$>$C_{18}$>$C_{14}$>$C_{12}$의 순으로 나타났고, 이들 중 세정력이 가장 우수한 sodium monoglycerol ${\alpha}$-sulfonated hexadecanonate는 무공해 세정제로서 기대성이 있는바 현재 공업적으로 대량 사용하고 있는 sodium ${\alpha}$-sulfonated alkanoic acid methyl ester와 sodium alkyl benzene sulfonate를 상대 비교한 결과, 보다 우수한 세정력을 나타내며 공업적 응용성에 기대성이 크다.