247537

Oxalic acid dihydrate

ACS reagent, ≥99%

• Synonym(s): Ethanedioic acid dihydrate
• Linear Formula: HO₂CCO₂H · 2H₂O
• CAS Number: 6153-56-6
• Molecular Weight: 126.07
• Beilstein: 3679436
• EC Number: 205-634-3
• MDL number: MFCD00149102
• UNSPSC Code: 12352100
• eCl@ss: 39021701
• PubChem Substance ID: 24854873
• NACRES: NA.21

Properties

• grade: ACS reagent
• Quality Level: 200
• vapor density: 4.4 (vs air)
• vapor pressure: <0.01 mmHg ( 20 °C)
• Assay: ≥99%; 99.5-102.5% (ACS specification)
• form: solid
• impurities: H₂SO₄, passes test (darkened); ≤0.001% N compounds; ≤0.005% insolubles
• ign. residue: ≤0.01%
• mp: 104-106 °C (lit.)
• anion traces: chloride (Cl^-): ≤0.002%; sulfate (SO₄^2-): ≤0.005%
• cation traces: Ca: ≤0.001%; Fe: ≤2 ppm; heavy metals: ≤5 ppm (by ICP-OES)
• SMILES string: [H]O[H].[H]O[H].OC(=O)C(O)=O
• InChI: 1S/C2H2O4.2H2O/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);2*1H2
• InChI key: GEVPUGOOGXGPIO-UHFFFAOYSA-N

Description

General description

Oxalic acid dihydrate is a promising candidate as a phase change material (PCM) for use in thermal energy storage (TES) technology due to its high heat of fusion and energy storage density/price ratio in comparison to other salt hydrates PCMs.

Application

Oxalic acid dihydrate may be used:

• As a catalyst in the preparation of tetrahydroquinoline derivatives via imino Diels-Alder reaction.
• As a homogeneous catalyst in the preparation of highly functionalized piperidines via multi-component reaction.
• As an oxidant for the formation of triazolinediones from corresponding urazoles and bisurazoles via oxidation.
• In the transformation of thiols to nitrosothiols by reacting with sodium nitrite.

Safety Information

• Pictograms: GHS05,GHS07
• Signal Word: Danger
• Hazard Statements: H302 + H312,H318
• Precautionary Statements: P264 - P280 - P301 + P312 - P302 + P352 + P312 - P305 + P351 + P338 - P362 + P364
• Hazard Classifications: Acute Tox. 4 Dermal - Acute Tox. 4 Oral - Eye Dam. 1
• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 1
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves