Description
5-Methyl-4-isoxazolecarboxylic acid is a heterocyclic carboxylic acid building block with a minimum assay of 95 %, CAS number 42831-50-5 and empirical formula C₅H₅NO₃. The molar mass of 127,1 g/mol enables precise dosing in synthetic and preparative work. The isoxazole core with a carboxylic acid handle supports standard coupling, esterification and further functionalisation strategies common in medicinal and organic chemistry. Clear identity data—CAS, formula and assay—facilitate quality documentation and batch records. This biochemical-grade reagent from manufacturer Carl ROTH is intended for research and development laboratories that need a reliable methyl-substituted isoxazolecarboxylic acid in a convenient bulk unit. The stated minimum purity supports reproducible experimental design across synthesis, screening and method optimisation tasks.
This article is part of Acids, in Acids & bases.
Key features
- Assay: ≥ 95 %
- Colour: reported
- Form: reported
- CAS number: 42831-50-5
- Pack sizes: 250 g, 500 g
- Empirical formula: C₅H₅NO₃
- Molar mass: 127,1 g/mol
- Weight: 0,322 kg
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
DangerHazard Statements (H-Phrases)
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Questions about 5-Methyl-4-isoxazolecarboxylic acid, min. 95 %, 250 g
What is this article?
5-Methyl-4-isoxazolecarboxylic acid, min. 95 %, 250 g is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Acids, inside Acids & bases, in Lab chemicals.
An acid on this shelf is the substance itself, concentrated or as a stated solution: hydrochloric, sulfuric, nitric, acetic and the rest. Concentration, purity and the trace metals decide the use. A concentrated acid and a volumetric solution of the same name are different products, and both burn.
An acid donates a proton. A base accepts one. In the bottle, the practical differences are the concentration, the purity and the anion or cation that comes along. Concentrated mineral acids are a different article from a dilute volumetric solution. The water in the acid, and the trace metals, decide whether it can be used for analysis. Check the substance on PubChem and the classification on ECHA CLP. Transport is the UNECE dangerous-goods framework. The legal texts are the CLP Regulation and REACH.
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Shelves beside this one are Bases & alkalis.
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