5-Methyl-1,2,4-oxadiazole-3-carboxylic acid

CAS 19703-92-5 C₄H₄N₂O₃ 128.09 g/mol Catalogue item Heterocycles

Structure of 5-Methyl-1,2,4-oxadiazole-3-carboxylic acid, CAS 19703-92-5 — Structure · C4H4N2O3

CAS number: 19703-92-5
Molecular formula: C₄H₄N₂O₃
Molecular weight: 128.09 g/mol
Standard packing: 1kg / 25kg / 100kg

CAS 19703-92-5, 5-Methyl-1,2,4-oxadiazole-3-carboxylic acid, is a C4H4N2O3 acid supplied in kilogram lots with a batch COA.

The carboxylic acid is activated in situ for amidation or esterification, or used directly for salt formation; the free acid is also the form that stores best. The methyl branch at C5 changes how the chain packs, which shows up in melting behaviour and in the solubility of the free material.

The formula C4H4N2O3 resolves to 4 carbons with 3 oxygens and 2 nitrogens. Short-chain entries of this size are volatile enough that headspace and packing matter: the lot is shipped in sealed units and opened in a fume hood.

Handling and storage

Acids are stored away from amines and bases, and the container is kept closed because the material is hygroscopic.

Ordering

The unit weights held are 1kg / 25kg / 100kg. A split shipment across two of those sizes is treated as one lot and one certificate. Where a specification has to be met on paper before shipment, it is agreed in writing and the lot is qualified against it rather than against the catalogue text.

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32477-35-3	1-(Heptafluorobutyryl)imidazole	C₇H₃F₇N₂O	264.10	1kg / 25kg / 100kg	Request
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872701-04-7	1H-1,2,3-Triazole-4-butanoic acid	C₆H₉N₃O₂	155.15	1kg / 25kg / 100kg	Request
16681-70-2	1H-1,2,3-Triazole-5-carboxylic acid	C₃H₃N₃O₂	113.08	1kg / 25kg / 100kg	Request
521300-19-6	1H-Pyrazole-3-carboxylic acid, 5-cyclopentyl-, ethyl ester	C₁₁H₁₆N₂O₂	208.26	1kg / 25kg / 100kg	Request
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Specification

CAS	19703-92-5
Formula	C₄H₄N₂O₃
Molecular weight	128.09 g/mol
Packing	1kg / 25kg / 100kg
Assay	lot specific, on COA
Appearance	see COA
Storage	cool, dry, inert

Ordering

Catalogue items ship from stock or are made to order, whichever the lot status requires. A gram-scale sample is available before a kilo lot is committed.

Request a quotation

Or email [email protected] quoting 19703-92-5.

Supplied for laboratory and industrial use. Not for drug, cosmetic or household use.

Quotation

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Entry	5-Methyl-1,2,4-oxadiazole-3-carboxylic acid
CAS	19703-92-5
Typical lead time	Stock or 2–4 weeks
Documentation	COA, SDS, spec sheet

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