If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf
247537
Oxalic acid dihydrate
ACS reagent, ≥99%
Synonym(s):
Ethanedioic acid dihydrate
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About This Item
Recommended Products
grade
ACS reagent
Quality Level
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 (SO42-): ≤0.005%
cation traces
Ca: ≤0.001%
Fe: ≤2 ppm
heavy metals: ≤5 ppm (by ICP-OES)
functional group
carboxylic acid
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
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General description
Application
- As a catalyst in the preparation of tetrahydroquinoline derivatives via imino Diels-Alder reaction.[2]
- As a homogeneous catalyst in the preparation of highly functionalized piperidines via multi-component reaction.[3]
- As an oxidant for the formation of triazolinediones from corresponding urazoles and bisurazoles via oxidation.[4]
- In the transformation of thiols to nitrosothiols by reacting with sodium nitrite.[5]
Signal Word
Danger
Hazard Statements
Precautionary Statements
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
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How is shipping temperature determined? And how is it related to the product storage temperature?
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Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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