• Journal of the Korean Chemical Society
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• v.39 no.1
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• pp.71-75
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• 1995

Tricarbonyl(2-methyl-1-phenylpentadienyl)iron(+1) hexafluorophosphate cation was prepared by the protonation of tricarbonyl(4-methyl-5-hexadien-1-ol)iron wit hexafluorophosphoric acid. Reaction of the cation with water, dimethyl cuprate, diphenylacetylenyl cuprate, and enolate of cyclohexanone gave the corresponding (η4-1,3-diene)Fe(CO)3. The regioselectivity for the nucleophilic attack appears to the predominantly the result of steric effect.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2003.10a
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• pp.149.2-149
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• 2003

비조사 김치와 2.5, 5 및 10 kGy로 방사선 조사된 김치로부터 SDE 방법으로 추출한 휘발성 유기화합물을 분석하여 변화를 확인하였다. 김치의 주요 휘발성 유기화합물로 ethyl formate, ethyl acetate, ethanol, dimethyl disulfide, methyl 2-propenyl disulfide가 다량 함유되어 있었고, ethyl methyl disulfide, 4-cyano-1-butene, pentane dinitrile 등도 상당량 함유되어 있었다. Ethyl formate, ethyl acetate, ethanol은 조사선량이 증가함에 따라 상당량 증가하는 것으로 확인되었으며, dimethyl disulfide, ethyl methyl disulfide, methyl propyl disulfide, pentane dinitrile, S-methyl methyl thiosulfonate 등도 선량이 증가함에 따라 함량이 증가하였다. 1-Penten-3-ol은 조사선량에 따라 감소하였다.

• YAKHAK HOEJI
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• v.33 no.4
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• pp.237-240
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• 1989

A new synthetic method for tiaprofenic acid, which is a potent anti-inflammatory agent, was described. Friedel-Crafts reaction of thiophene with ethyl ${\alpha}-chloro-{\alpha}-(methylthio)$ acetate (1) gave ethyl ${\alpha}-methylthio-2-thiopheneacetate$ (3). Ethyl ${\alpha}-methyl-2-thiopheneacetate$ (5) was prepared by treatment of (3) with NaH and MeI, followed by desulfurization with zinc dust-acetic acid of the resultant ethyl ${\alpha}-methyl-{\alpha}-methylthio-2-thiopheneacetate$ (4). Tiaprofenic acid (7) could be easily synthesized by benzoylation of (5) and hydrolysis of the resultant ethyl $5-benzoyl-{\alpha}-methyl-2-thiopheneacetate$ (6).

• YAKHAK HOEJI
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• v.33 no.4
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• pp.246-252
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• 1989

2-Amino-1-N-methyl benzamide, 2-N-benzyl amino benzamide, 2-N-phenyl amino benzamide of 2-amino benzamide derivatives were reacted with ${\alpha}-bromo$ acetaldehyde diethyl acetal in basic condition. 2-N-alkylated products were prepared from 2-amino-1-N-methyl benzamide and 2-N-phenyl amino benzamide. 1-N-benzyl-1.4-benzodiazepin-5-one was prerpared from 2-N-benzyl aminobenzamide via intramolecular cyclization. However, 2-amino-1-N-methyl benzamide with sodium amide did not react to 1.4-benzodiazepin-5-one derivative but 3-methyl-quinazoline-2.4-dione was obtained.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.37 no.5 s.113
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• pp.35-40
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• 2005

We tried to synthesize the 2-methyl anthraquinone (2-MAQ) with reaction between phthalic anhydride and toluene instead of using 2-methyl phthalic anhydride and benzene. This process didn't generate significant of amount of 1-methyl anthraquinone (l-MAQ) as byproduct. The other advantage of this pathway is using less toxic toluene instead of benzene known as carcinogen. 2-MAQ synthesized this pathway was as effective as reagent grade from commercial available based on soda-anthraquinone(AQ) pulping results.

• The Korean Journal of Food And Nutrition
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• v.12 no.4
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• pp.415-420
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• 1999

Petal of Azalea(Rhododendron mucronulatum Turcz) was incubated with Gokja at 3$0^{\circ}C$ for seven days and the essential oil components of petal of Azalea before and after incubated were analyzed using a GC/MSD. Ten or more essential oil components including n-heneicosane n-tricosane n-tetreacosane n-pentacosane n-heptacosane n-nonacosane and n-hentriacontane were identified from the petal of Azal-ea before incubated while oxygen-containng compounds including (E)-heptenal 2-ethoxy-1 -hexanol n-hexadecanoic acid methyl ester 9, 12-octadecadienoic acid methyl ester 9,12,15-octadecatrienoic acid methyl ester, n-octadecanoic acid methyl ester n-eicosanoic acid methyl ester and 9-docosaenoic acid methyl ester as well as n-alkanes such as n-tricosane that n-pentacosane were identified from the petal of Azalea after incubated. These results suggest that n-alkanes in petal of Azalea might be degraded and some oxygen-containing compounds such as aldehyde, esters and /or acids might be produced when pet-al of Azalea is incubated with Gokja.

• Archives of Pharmacal Research
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• v.10 no.1
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• pp.50-59
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• 1987

(E)-2-Phenylcyclopropylamine ((E)-TCP), (Z)-2-Phenylacyclopropylamine ((Z)-TCP), (E)-1-methyl-2-phenylcyclopropylamine ((E)-MTCP), and (Z)-1-methyl-2-phenylcyclopropylamine ((Z)-MTCP) were synthesized and used to determine to what extent 1-methylsubstitution and stereochemistry of 2-phenycyclopropylamines affect inhibition of monoamine oxidase (MAO). Inhibition of rat brain mitochondrial MAO-A and B by the compounds were measured using serotonin and benzylamine as the substrate, respectively and $IC_{50}$ values obtianed with 95% confidence limits by the method of computation. For the inhibition of MAO-A, (E)-MTPC ($IC_{50}$ = 6.2 * $10^{-8}$M) was found to be 37 times more potent than (Z)-MTCP ($IC_{50}$ = 7.8 * $10^{-8}$M), was 7 times more potent than (Z)-MTCP($IC_{50}$= 4.7 * $10^{-7}$M) and (E)-TCP($IC_{50}$ =7.8 * $10^{-8}$M),0.6 times as potent as (Z)- TCP ($IC_{50}$ = 4.4 * $10^{-8}$M). The results suggested that while without 1-methyl group, potency of a (Z)-isomer was comparable to that of (E)-isomer, the methyl group in its (Z)-position was very unfavorable to the inhibition of MAO and that in its (E)-position, the methyl group contributed positively to the potency as found by the fact that (E)-MTCP was 1-5 times more potent than (E)-TCP. In view of the selective inhibition of MAO-A- or B over MAO-A and 1-methyl substitution as well as the stereochemical factors did not significantly influence the selectivity.

• Journal of the Korean Chemical Society
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• v.55 no.3
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• pp.405-411
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• 2011

The ab initio calculations for fluoromethyl fluoroperoxides have been carried out using MP2/6-311G(d,p) and B3LYP/6-311++G(d,p) method. The structural optimizations were performed for several isomers and conformers of methyl fluoroperoxide, $CH_3OOF$ and the vibrational frequencies were calculated. The most stable conformer of $CH_3OOF$ is skew form and has fairly short O-O bond distance. The trans and cis conformers have 8-12 kcal/mol higher energies than skew form and the other isomers are very unstable. The structures of $CH_2FOOF$, $CHF_2OOF$ and $CF_3OOF$ are also optimized and vibrational frequencies were calculated. These molecules also have skew forms as the lowest energy conformers. The O-O bond distances are longer and C-O bond distances are shorter than $CH_3OOF$, but the structural parameters are almost independent of the number of fluorine atoms in methyl group.

• Journal of Food Hygiene and Safety
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• v.2 no.4
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• pp.181-189
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• 1987

To find esterase inhibitors and in the metabolites of Streptomyces strain DMC-498, two active compounds were isolated from the methanol extract of the mycelia of the strain by Silica gel column chromatography and preparatory argentation TLC. These compounds were proved to show competitive inhibition. Compound B was found to consist of linoleic and oleic acids. Fifty percent inhibition concentration ($lC_{50}$) of linoleic acid was $0.045\mu\textrm{g}/ml$, whereas oleic acid exhibited no inhibitory activity. Associated lipids: isostearic acid, isostearic acid methyl ester, oleic acid methyl ester and linoleic acid methyl ester, were isolated from the same extract, showing no inhibition of the esterase. Compound A was found to be a liquid inhibitor with an alicyclic ring and two or more oxygens, its molecular weight being more than 500.

• Applied Biological Chemistry
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• v.50 no.3
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• pp.233-237
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• 2007

The roots of Brassica campestris ssp rapa were extracted with 80% aqueous MeOH, and the concentrated extract was partitioned with EtOAc, n-BuOH and $H_{2}O$. From the EtOAc and n-BuOH fractions, five compounds were isolated through the repeated silica gel column chromatographies. From the result of spectroscopic data including NMR and MS, the chemical structures of the compounds were determined as palmitic acid methyl ester (1), linolenic acid methyl ester (2), linoleic acid methyl ester (3), ${\beta}-sitosterol$ (4) and daucosterol (5).