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21169-71-1 - Isoxazole-5-carboxylic acid, 98% - A13739 - Alfa Aesar

A13739 Isoxazole-5-carboxylic acid, 98%

CAS Number

Size Price ($) Quantity Availability
1g 66.90
5g 249.00
25g 1055.00
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Isoxazole-5-carboxylic acid, 98%


Chemical Properties

Formula Weight
Melting point
Moisture Sensitive
Slightly soluble in water.


Reaction conditions were found to allow the exclusive formation of isoxazole-5-carboxylic acid derivatives by conjugate addition, in acidic medium, of hydroxylamine to β-alkoxyvinyl trichloromethyl ketone in synthesis and reactivity of isoxazoles. Isoxazole-5-carboxylic acid participates in the Synthesis and evaluation of acylguanidine FXa inhibitors. 1, 1, 1-trichloro-4-methoxy-3-penten-2-one postulated in the preparation of isoxazole-5-carboxylic acid from trichloroacetyl chloride, ethyl vinyl ether and hydroxylamine is developed in a fully saturated nitrogen atom theerefore there is no possibility of conjugation with 4- substituents.


Moisture Sensitive. Store in cool place. Keep container tightly closed in a dry and well-ventilated place. Store away from strong oxidizing agents, reducing agents, bases.

Literature References

Pinho e Melo,; Teresa M.V.D. Recent Advances on the Synthesis and Reactivity of Isoxazoles. Current Organic Chemistry. 2005, 9(10), 925-958(34)

Martins, Marcos A. P.; Cunico, Wilson; Pereira, Claudio M. P.; Sinhorin, Adilson P.; Flores, Alex F. C.; Bonacorso, Helio G.; Zanatta, Nilo. 4-Alkoxy-1,1,1-Trichloro-3-Alken-2-ones: Preparation and Applications in Heterocyclic Synthesis . Current Organic Chemistry. 2004, 1(4), 391-403(13).

GHS Hazard and Precautionary Statements

Hazard Statements: H315-H319-H335

Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.

Precautionary Statements: P260-P201-P280g-P304+P340-P405-P501a

Do not breathe dust/fume/gas/mist/vapours/spray. Obtain special instructions before use. Wear protective gloves. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.

Other References

Harmonized Tariff Code


  • B20081

    Benzyl mercaptan, 99%
  • H26082

    O-(7-Aza-1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate, 99%
  • H30179

    Oxazole-5-carboxylic acid, 98+%
  • H32992

    (4-Imidazolyl)acetonitrile, 97%
  • L00821

    Carbon tetrabromide, 98% (dry wt.), may cont. up to ca 6% water

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