• Journal of the Korean Chemical Society
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• v.15 no.3
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• pp.117-120
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• 1971

Possibility of two phase reduction of carbonyl compounds to the corresponding alcohols was studied. Thus the 0.5 M ether solutions of the representative carbonyl compounds were treated with alkaline stabilized sodium borohydride aqueous solution at room temperature. Butyraldehyde was reduced rapidly within one hr., whereas other aldehydes tested; heptaldehyde, benzaldehyde, and 1-naphthaldehyde were reduced in 6-12 hr. 2-Heptanone was reduced much slowly; 87% in 48 hr., however, acetophenone was reduced moderately; 92% in 12 hr. and cycloalkanones were reduced rapidly (cyclohexanone in 0.5 hr., and cyclopentanone in 3-6 hr.).

• Bulletin of the Korean Chemical Society
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• v.23 no.1
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• pp.41-47
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• 2002

The reactions of 3-methyl-1-phenyl-5-oxo-${\Delta}^2$-pyrazoline-4-thiocarbohydrazide towards phenyl isothiocyanate, sodium nitrite, cyclohexanone, aromatic aldehydes, and carbon disulphide has been studied. The Vilsmeier-Haack reaction has been applied on 4-substituted pyrazolone derivatives.

• Bulletin of the Korean Chemical Society
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• v.9 no.5
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• pp.322-324
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• 1988

Selective reduction of aldoximes and ketoximes with lithium borohydride in tetrahydrofuran was investigated. Thus, aldoximes and cyclic ketoximes such as hexanaldoxime, heptanaldoxime, cyclopentanone oxime and cyclohexanone oxime were reduced smoothly to the corresponding N-monosubstituted hydroxylamines at room temperature in 65-93% yield. The reduction of alicyclic ketoxime was very slow, requiring somewhat high reaction temperature ($65^{\circ}C$) for the complete reduction to give the hydroxnylamines. The reduction of aromatic oximes such as benzaldoxime and acetophenone oxime was very sluggish, giving a mixture of the corresponding hydroxylamines and amines at $65^{\circ}C$.

• Applied Chemistry for Engineering
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• v.21 no.4
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• pp.430-434
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• 2010

The sheet for electromagenetic interference (EMI) shielding was prepared with slurry made by the mixture of binder, methyl ethyl ketone, cyclohexanone and metal powder. We tried to enhance the shielding efficiency by adding carbon nanotube (CNT), which has known as highly conducting material. Surface and component analyses were carried out with SEM and EDS, respectively. The electric characteristics and EMI shielding efficiencies were measured with 4-point probe measurement and EMI efficiency measurement equipment. The sheet with 2% CNT addition showed the lowest electrical resistance, $13.13{\Omega}}{\cdot}cm$. It also showed the highest EMI shielding efficiency of 63 dB.

• Journal of the Korean Electrochemical Society
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• v.6 no.2
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• pp.113-118
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• 2003

Processible polyaniline (PAM) dispersions consisting of polyaniline micro-particles, cyclohexanone, and a polymeric surfactant were prepared in a micro-milling machine with various mixing conditions. The electrochemical properties of the dispersion film coated on Pt electrode were investigated by cyclic voltammetry (CV). The electrochemistry of the PAM dispersion coatings was basically similar to a pure PAM coating based on the results of CV. The results of polarization measurements and open circuit potential measurements carried out in $3\;wt.\%$ NaCI solution showed increase in corrosion potential when the PANI dispersion coatings applied on steel surface. Variation of open circuit potential $(OCP,\;V_{OC})$ of the dispersion coating/steel electrodes was observed, which differed with milling conditions. The results demonstrated practical use of the conducting polymer dispersion as a coating material for corrosion prevention of steel.

• Applied Chemistry for Engineering
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• v.9 no.7
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• pp.1053-1058
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• 1998

Poly(vinyl butyral)s (PVB) with different butyral content were synthesized from poly(vinyl alcohol)(PVA) and n-butylaldehyde with acid catalyst. Bound butyral unit in PVB was determined by elemental analysis. Synthesized PVBs were reacted with p-azidobenzaldehyde to give photosensitive polymer with azidobenzene group(PVB-AZ). Bound photosensitive azidobenzene group in PVB-AZ was determined by UV spectrophotometry. The photosensitivity of PVB-AZ was compared with that of PVB/2,6-bis(p-azidobenzylidene)cyclohexanone(BAC) photosensitizer mixture system by gray scale method. Photosensitivity of PVB-AZ was higher than that of PVB/BAC mixture system. The photosensitivity of PVB-AZ was dependent on the developer used due to the solubility of PVB-AZ in a developer solvent.

• Biomedical Science Letters
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• v.12 no.3
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• pp.241-247
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• 2006

To evaluate an effect of pathological liver damage on the cyclohexane (CH) metabolism, rats were pretreated with 50% carbon tetrachloride $(CCl_4)$ dissolved in olive oil (0.1ml/100g body weight) 10 or 17 times intraperitoneally at intervals of every other day. To these liver damaged animals, CH (a single dose of 1.56g/kg body weight, i.p.) was administered at 48hr after the last injection of $CCl_4$. The CH metabolites; cyclohexanol (CH-ol), cyclohexane-l,2-diol (CH-l,2-diol) and cyclohexane-l,4-diol (CH-l,4-diol) and cyclohexanone (CH-one) were detected in the urine of CH treated rats. After CH treatment, the serum levels of CH-ol and CH-one were remarkably increased at 4 hr and then decreased at 8hr in normal group. Whereas in liver damaged rats, these CH metabolites were higher at 8hr than at 4hr. The excretion rate of CH metabolites trom serum into urine was more decreased in liver damaged animals than normal group, with the levels of excretion rate being lower in $CCl_4$ 17 times injected animals than 10 times injected ones. It was interesting that the urinary concentration of CH metabolites was generally more increased in liver damaged animals than normal ones, and the increasing rate was higher in $CCl_4$ 17 times injected rats than 10 times injected ones. Taken all together, it is assumed that reduced urinary excretion rate of CH metabolites in liver damaged rats might be resulted from deteriorated hepatic and renal blood flow, and an increased urinary excretion amount of CH metabolites in liver damaged rats might be caused by reduced expiration amount of the metabolites due to lung damage.

• Journal of the Korean Magnetics Society
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• v.6 no.4
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• pp.251-257
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• 1996

A coercivity of barium ferrite (BaM) tape was found to be higher than the coercivity of BaM powder, This difference is in the range of 50 Oe to 600 Oe, which depends on substituted cations. physical properties of powder, and preparation conditions of the tape. The coercivity difference is attributed to both particle stacking and adsorption of organic solvent on particle surface. Regardless of substituted cations, the coercivity of longitudinally oriented BaFe tape was higher than that of BaM powder by a range of 100 Oe to 120 Oe, which is caused by particle stacking' During the active adsorption process on preparation of magnetic paint, where MEK (methyl ethyl ketone), TOL (toluene) and CHO (cyclohexanone) were used, chemisorption of solvents on the surface of substituted BaFe particle occurred to form polymeric compounds surrounding the particle. An increase in coercivity, caused by the solvent adsorption, was significant for Co-substutited BaM tape. Among these solvents CHO was the most effective one in increasing the coercivity of the Co-Ti substituted BaM tape.

• Food Science and Preservation
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• v.12 no.1
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• pp.68-74
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• 2005

This study was carried out to analyze to the flavor components of Lindera obtusiloba BL leaf teas by different processing methods. 81 kinds of flavor components in the masted tea, 78 in the roasted tea after steaming, 88 in the withered tea, 86 in the fermented tea, 72 in the steamed tea, and 89 in the air dried tea ware by GC/MS. Hydrocarbones in Lindera obtusiloba BL leaf teas were 45 kinds of $\beta-piepne$, and 16 kinds of alcohols such as Linalool, n-octanoal, phenyl acetaldehyde, $(-)-\alpha-terpineol$, elemol, and cholest-5-en-3-ol. 11 kinds of ketones sachas 2-ethyl-2- propyl-cyclohexanone, and 8 kinds of aldehydes sach as phenyl acetaldehyde, tetradecanal, 10-undecanal, 4-Bromo-2-methylbutanal were found. Esters were methyl 9,12,15-octadecatrienate, didodecyl phthalace, 1,2-benzenediccarbaboxy acid-bis (2-ethylhexyl)ester and phenols was 2,6-bis(1,1-dimethylethyl)-4-methyl-phenol.

• Bulletin of the Korean Chemical Society
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• v.33 no.8
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• pp.2494-2498
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• 2012

Preparation of several new spirocyclic mercapto derivatives is described. Thiol protection on multi-carbonyl compounds allows of high sulfur content necessary to induce high refractive index. Condensation of 1,3-dimercapto-2-propanol and cyclohexanone followed by successive oxidation and thioacetalization affords a dispirocycle with four sulfurs. Selective S,S-protection of cyclohexane-1,4-dione is achieved with 1,3-dimercapto-2-propanol and 2,3-dimercapto-1-propanol to provide dispirocycles with four sulfurs. Olefine-oxidation of norbornene gives a useful dialdehyde intermediate which is transformed to 1,3-dithiolane for a linearly-bound-cyclic molecule. Refractive index of linearly-bound-cycles was below 1.60 and dispirocycles exhibited high refractive index of 1.57-1.69.