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CAS RN: 124522-09-4 | Product Number: A5553

3-Bromomethyl-7-methoxy-1,4-benzoxazin-2-one [for HPLC Labeling]

Purity: >98.0%(T)
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Product Number A5553
Purity / Analysis Method >98.0%(T)
Molecular Formula / Molecular Weight C__1__0H__8BrNO__3 = 270.08  
Physical State (20 deg.C) Solid
Storage Temperature 0-10°C
Condition to Avoid Light Sensitive,Heat Sensitive
CAS RN 124522-09-4
PubChem Substance ID 87563171
MDL Number


Appearance Light yellow to Brown powder to crystal
Purity(HPLC) min. 97.0 area%
Purity(Argentmetric Titration) min. 98.0 %
Effect test of HPLC derivatization Effective as labeling agent for Linoleic Acid , Oleic Acid
Properties (reference)
Pictogram Pictogram
Signal Word Warning
Hazard Statements H315 : Causes skin irritation.
H319 : Causes serious eye irritation.
Precautionary Statements P264 : Wash skin thoroughly after handling.
P280 : Wear protective gloves/ eye protection/ face protection.
P302 + P352 : IF ON SKIN: Wash with plenty of water.
P337 + P313 : If eye irritation persists: Get medical advice/ attention.
P305 + P351 + P338 : IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P362 + P364 : Take off contaminated clothing and wash it before reuse.
P332 + P313 : If skin irritation occurs: Get medical advice/ attention.
Related Laws:
Transport Information:
H.S.code* 2934.99-000
*This code is applied to the products when TCI exports from Japan and not for import in your country.
HPLC Labeling Reagent for Carboxylic Acids

The compound 1 is an HPLC labeling reagent, which has a bromoacetyl group and easily reacts with a carboxyl group to form the corresponding ester in the presence of a base. The resultant ester is stable and can reach the detector without any decomposition under reversed phase HPLC. An excellent chromatogram can be obtained by measuring at 254 nm, an absorption wavelength that is generally used for UV detection. Application examples:[Fatty acids]1, 2, 8, 9)Dissolve a sample in methanol or water, and then neutralize the sample solution with methanol solution of KOH-crown ether. Evaporate to dryness under reduced pressure, and then you will see a generally almost white solid substance remaining (potassium salt of fatty acid). Next, add the HPLC labeling reagent 1 with acetonitrile solution* of 18-crown 6-ether to this white solid and further add acetonitrile for a volume up to 1 mL. Incubate the solution at 8 ºC for 15 min. Cool the resultant solution to room temperature and use it as an HPLC sample.* Benzene can be used in the place of acetonitrile. The mixing ratio (molar ratio) for the HPLC labeling reagent 1 and 18-crown 6-ether should be 2 to 1 and 1 to 1 for the sample fatty acid concentrations at .5~2 mM and less than .5 mM, respectively. Use the excessive amount of the reagent 1.[Others]Dicarboxyl acids2), synthetic prostaglandins3), unsaturated fatty acids4), alkyl methylphosphonate5), ganglioside6), betaine7)TCI Products Pamphlet


1)H. Naganuma, A. Nakanishi, J. Kondo, K. Watanabe, Y. Kawahara, Sankyo Kenkyusho Nempo 1988,

2)A. Nakanishi, H. Naganuma, J. Kondo, K. Watanabe, Y. Kawahara, Program and Abstracts 109th Congress of the Pharmaceutical Society of Japan, 6TA, 2-1.

3)A. Nakanishi, H. Naganuma, J. Kondo, K. Watanabe, K. Hirano, T. Kawasaki, Y. Kawahara,J. Chromatogr. 1992, 591, 159.

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