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247537

Sigma-Aldrich

Oxalic acid dihydrate

ACS reagent, ≥99%

Sinonimo/i:

Ethanedioic acid dihydrate

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About This Item

Formula condensata:
HO2CCO2H · 2H2O
Numero CAS:
Peso molecolare:
126.07
Beilstein:
3679436
Numero CE:
Numero MDL:
Codice UNSPSC:
12352100
eCl@ss:
39021701
ID PubChem:
NACRES:
NA.21

Grado

ACS reagent

Livello qualitativo

Densità del vapore

4.4 (vs air)

Tensione di vapore

<0.01 mmHg ( 20 °C)

Saggio

≥99%
99.5-102.5% (ACS specification)

Forma fisica

solid

Impurezze

H2SO4, passes test (darkened)
≤0.001% N compounds
≤0.005% insolubles

Residuo alla calcinazione

≤0.01%

Punto di fusione

104-106 °C (lit.)

Anioni in tracce

chloride (Cl-): ≤0.002%
sulfate (SO42-): ≤0.005%

Cationi in tracce

Ca: ≤0.001%
Fe: ≤2 ppm
heavy metals: ≤5 ppm (by ICP-OES)

Stringa SMILE

[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
GEVPUGOOGXGPIO-UHFFFAOYSA-N

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Descrizione generale

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.

Applicazioni

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.

Pittogrammi

CorrosionExclamation mark

Avvertenze

Danger

Indicazioni di pericolo

Classi di pericolo

Acute Tox. 4 Dermal - Acute Tox. 4 Oral - Eye Dam. 1

Codice della classe di stoccaggio

11 - Combustible Solids

Classe di pericolosità dell'acqua (WGK)

WGK 1

Dispositivi di protezione individuale

dust mask type N95 (US), Eyeshields, Gloves


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Effects of sodium chloride on the thermal behavior of oxalic acid dihydrate for thermal energy storage
Han L, et al
Applied Energy, 185, 762-767 (2017)
A Convenient Method for the Oxidation of Urazoles to Their Corresponding Triazolinediones Under Mild and Heterogeneous Conditions with Sodium Nitrite and Oxalic Dihydrate.
Zolfigolo MA and Mallakpour SE.
Synthetic Communications, 29(22), 4061-4069 (1999)
One-pot five-component synthesis of highly functionalized piperidines using oxalic acid dihydrate as a homogenous catalyst.
Sajadikhah SS, et al.
Chinese Chemical Letters = Zhongguo Hua Xue Kuai Bao, 23(5), 569-572 (2012)
An Efficient Method for Production and Storage of Unstable S-Nitrosothiols Under Mild and Heterogeneous Condition with Sodium Nitrite and Oxalic Acid Dihydrate.
Zolfigol MA, et al.
Synthetic Communications, 29(13), 2277-2280 (1999)
Imino Diels-Alder reactions catalyzed by oxalic acid dihydrate. Synthesis of Tetrahydroquinoline derivatives.
Nagarajan R and Perumal PT.
Synthetic Communications, 31(11), 1733-1736 (2001)

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