• Journal of the Korean Society of Tobacco Science
• /
• v.27 no.2
• /
• pp.178-188
• /
• 2005

To use the filter materials for selective removal of carbonyl compounds in cigarette mainstream smoke, hydrazine such as 2,4-dinitrophenylhydrazine and dansylhydraznie impregnated adsorbents were prepared with perchloric acid or phosphoric acid as a accelerator in hydrazone formation reaction. The change of morphology of adsorbents in various of impregnator were investigated by SEM. Impregnation amount caused by reaction time, acid type and impregnation reagent, and the adsorption properties of carbonyl compounds in cigarette mainstream smoke were investigated. Amounts of impregnation was increased as increasing reaction time. The removal amount for vapor phase carbonyl compounds by 2,4-DNPH impregnated adsorbent was higher than that of dansylhydrazine impregnated adsorbent. The selectivity of 2,4-DNPH impregnated polyacrylic type adsorbent was superior to those of other adsorbents. This results indicated that the 2,4-DNPH impregnated polyacrylic adsorbent was applicable to cigarette filter material because of its fast reactivity and porosity.

• Journal of the Korean Chemical Society
• /
• v.48 no.3
• /
• pp.261-265
• /
• 2004

We investigated the order of local movement of functional groups (-C(=O)O) in a liquid crystalline (LC) oligomer (12-4) using 2D Raman correlation spectroscopy. The results suggest that the free carbonyl near the ethyl terminal group moved first, followed by the hydrogen-bonded group. The free carbonyl group between the biphenyl groups rarely moved. Interestingly, 2D sample-to-sample correlation spectroscopy (2D STSCS) revealed that some of the carbonyl modes started to move at far below (50$^{\circ}C$) the LC temperature (135$^{\circ}C$), countering conventional beliefs.

• Journal of the Korean Chemical Society
• /
• v.15 no.3
• /
• pp.117-120
• /
• 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
• /
• v.28 no.7
• /
• pp.1167-1170
• /
• 2007

A simple and convenient method for the addition of TMSCN to carbonyl compounds is described. NbCl5 is found to possess a strong Lewis acid property to transform carbonyl compounds smoothly to the corresponding cyanosilylether in high yields (up to 99 %) in solvent- free conditions.

• Bulletin of the Korean Chemical Society
• /
• v.30 no.5
• /
• pp.1164-1166
• /
• 2009

Aromatic aldehydes are efficiently self-condensed into $\alpha$-hydroxy carbonyl compounds by polystyrene-supported ammonium cyanide as an excellent organocatalyst in C-C bond formation. The reaction proceeds in water under mild reaction conditions. The polymeric catalyst can be easily separated by filtration and reused several times without appreciable loss of activity.

• Bulletin of the Korean Chemical Society
• /
• v.19 no.11
• /
• pp.1244-1248
• /
• 1998

Ozonolysis reactions of cyclic olefins 1a-c and norbomene In in the presence of trifluoroactophenone 6 provided the corresponding cross-ozonides 7a-c and 7n. Further reactions of ozonides 7a-c and 7n with the independently prepared carbonyl oxide 11 gave diozonides of structure l0a-c and 10n. The ozonolysis of 1methylcyclopentene 12a and 1-methylcyclohexene 12b in the presence of trifluoroactophenone 6 provided exclusively ozonide 15 and 16 derived from capture of carbonyl oxide 13. All of the new ozonides have been isolated as pure substances and characterized by their 1H NMR and 13C NMR spectra.

• Bulletin of the Korean Chemical Society
• /
• v.24 no.4
• /
• pp.453-459
• /
• 2003

(Pyridine)(tetrahydroborato)zinc complex, $[Zn(BH_4)_2(py)]$, as a stable white solid, was prepared quantitatively by complexation of an equimolar amount of zinc tetrahydroborate and pyridine at room temperature. This reagent can easily reduce variety of carbonyl compounds such as aldehydes, ketones, acyloins, α-diketones and a, β-unsaturated carbonyl compounds to their corresponding alcohols in good to excellent yields. Reduction reactions were performed in ether or THF at room temperature or under reflux conditions. In addition, the chemoselective reduction of aldehydes over ketones was accomplished successfully with this reducing agent.

• Nutritional Sciences
• /
• v.6 no.2
• /
• pp.94-99
• /
• 2003

The purpose of this study was to investigate in vivo lipid peroxidation in rats under conditions of streptozotocin-induced oxidative stress and the antioxidant effects of probucol. In vivo lipid peroxidation was observed by measuring low molecular weight aldehydes and related carbonyl compounds in rat urine. Three groups of male Wistar rats weighing 165-190 g were used: normal (N), streptozotocin-induced oxidative stress (OS) and oxidative stress plus probucol treatment (P). following streptozotocin treatment of the rats, a variety of secondary lipid peroxidation products were increased. The levels of butanal, hexanal, hex-2-enal, kept-2-enal, octanal, non-2-enal, deca-2,4-dienal, 4-hydroxyhex-2-enal, 4-hydroxyno n-2-enal, malondi aldehyde(MDA), and unknown carbonyl compounds were significantly increased in the oxidative stress group compared to the control group. Treatment with probucol resulted in significant decreases in buoal, hexanal, hex-2-enal, octanal, deca-2,4-dienal, 4-hydroxyhex-2-enal, MDA and unknown carbonyl compounds. Hept-2-enal, hepta-2,4-dienal and non-2-enal appeared to have a tendency to decrease due to pobucol treatment.

• Transactions of Materials Processing
• /
• v.21 no.2
• /
• pp.138-143
• /
• 2012

A polishing method using magnetorheological (MR) fluid has been developed as a new precision technique to obtain a fine surface. The process uses a MR fluid that consists of magnetic carbonyl iron (CI) particles, nonmagnetic polishing abrasives, water and stabilizers. But the CI particles in MR fluids cause a severe corrosion problem. When coated with Xanthan gum, the CI particles showed long-term stability in corrosive aqueous environment. The surface roughness obtained from the MR polishing process was evaluated. A series of experiments were performed on fused silica glass using prepared slurries and various process conditions, including different polishing times. Outstanding surface roughness of Ra=2.27nm was obtained on the fused silica glass. The present polishing method could be used to produce ultra-precision micro parts.

• Journal of the Korean Chemical Society
• /
• v.30 no.2
• /
• pp.248-258
• /
• 1986

The electronic structures and geometries of model substituted oxiranes, and carbonyl ylides containing cyano, methoxy and thiomethoxy substituents were investigated by MNDO-SCF-MO method. Stabilization and geometries caused by substituents, the ease of formation of carbonyl ylides from oxiranes and the reactivities of the cycloaddition of substituted carbonyl ylides were investigated.