• Bulletin of the Korean Chemical Society
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• v.22 no.6
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• pp.644-646
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• 2001

• Korean Journal of Food Science and Technology
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• v.7 no.1
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• pp.15-21
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• 1975

Soong-Neung is a Korean traditional beverage served after meals and is made from cooked and roasted rice produced on the bottom of the container during the rice cooking process. The volatiles from the extract of cooked and roasted rice were separated into pyrazine and carbonyl fractions and qualitatively investigated. The pyrazine fraction was characterized by gas chromatography and combined gas chromatography-mass spectrometry and five pyrazines were positively identified. Pyrazine compounds identified are 2-methylpyrazine, 2,3-dimethylpyrazine, 2,5-dimethylpyrazine, 2-ethyl-5-methylpyrazine and 2-ethyl-3-methylpyrazine. Carbonyls were converted to their 2,4-dinitrophenylhydrazones and identified by gas chromatography, combined gas chromatography-mass spectrometry and thin layer chromatography. Acetaldehyde, propionaldehyde, iso-butyraldehyde and iso-valeraldehyde were positively identified in the carbonyl compounds. The aroma of the fractions indentified as 2,3-dimethylpyrazine and 2,5-dimethylpyrazine had a nut-like or roasted cereal-like flavor, which is one of the characteristic flavors of Soong-Neung.

• Bulletin of the Korean Chemical Society
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• v.24 no.4
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• pp.407-408
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• 2003

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2007.10a
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• pp.123-125
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• 2007

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2010.04a
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• pp.438-440
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• 2010

• Journal of the Korean Chemical Society
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• v.46 no.5
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• pp.462-483
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• 2002

• Bulletin of the Korean Chemical Society
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• v.24 no.7
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• pp.1002-1004
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• 2003

• Bulletin of the Korean Chemical Society
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• v.25 no.1
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• pp.42-44
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• 2004

Valerophenones containing a substituent at alpha position to the carbonyl group show the remarkable substituent effects on their photochemical reactions. ${\alpha}$-Bromovalerophenone gives only the C-Br bond cleavage products, but the ${\alpha}$-chlorovalerophenone follows the classical Norrish/Yang reaction pathway predominantly.

• Bulletin of the Korean Chemical Society
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• v.20 no.12
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• pp.1437-1440
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• 1999

Ozonolysis reactions of indene 5 in the presence of carbonyl compounds 6 provided the corresponding indenemonoozonide 9 and cross-ozonides 10a-c and 11a-c. Further reactions of ozonides 10 and 11 with the independently prepared carbonyl oxide 13 gave diozonides of structure 14a-c and 15a-c.

• Journal of the Korean Wood Science and Technology
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• v.37 no.1
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• pp.12-18
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• 2009

This study was attempted to investigate indoor air quality of a wooden house. Emission characteristics of carbonyl compounds from indoors whose interiors were finished using ecofriendly materials were detected. From the results of the examination, the carbonyl compounds mostly consisted of formaldehyde, acetaldehyde, and hexaldehyde. Especially, formaldehyde accounted for the largest portion of the compounds at 25.6~30.5%. All the rooms except for R2-2 contained formaldehyde less than criteria of indoor air quality of newly-constructed houses. In addition, all the rooms except for room R1-3, contained acetaldehyde more than the level of $48{\mu}g/m^3$ recommended by Japan's Ministry of Health, Labour and Welfare. As a results of the different wall covering, the room R1-1 of Hwangto emitted relatively higher levels of carbonyl compounds than the room R2-1 of phytoncide. In addition, the room R2-2 of the bamboo charcoal panels emitted more carbonyl compounds than the room R1-2. The living room R1-3 of Japanese cypress (Cryptomeria Japonica) emitted lower levels of carbonyl compounds than other rooms.