239216

Calcium carbonate

ACS reagent, ≥99.0%, powder

• Wzór liniowy: CaCO₃
• Numer CAS: 471-34-1
• Masa cząsteczkowa: 100.09
• Beilstein: 8008338
• Numer WE: 207-439-9
• Numer MDL: MFCD00010906
• Kod UNSPSC: 12352300
• Identyfikator substancji w PubChem: 329752519
• NACRES: NA.21

Właściwości

• klasa czystości: ACS reagent
• Próba: ≥99.0%
• Postać: powder
• zanieczyszczenia: ≤0.002 meq/g water-soluble titr. base; ≤0.005% oxidizers; ≤0.01% NH₄OH pptd.; ≤0.01% insol. dil. HCl
• pH: 8
• gęstość: 2.93 g/mL at 25 °C (lit.)
• ślady anionów: chloride (Cl^-): ≤0.001%; fluoride (F^-): ≤0.0015%; sulfate (SO₄^2-): ≤0.01%
• ślady kationów: Ba: ≤0.005%; Fe: ≤0.003%; K: ≤0.01%; Mg: ≤0.02%; NH₄⁺: ≤0.003%; Na: ≤0.1%; Sr: ≤0.1%; heavy metals: ≤0.001% (by ICP-OES)
• ciąg SMILES: [Ca++].[O-]C([O-])=O
• InChI: 1S/CH2O3.Ca/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2
• Klucz InChI: VTYYLEPIZMXCLO-UHFFFAOYSA-L

Opis

Opis ogólny

CaCO₃ occurs naturally as the principal constituent of limestone, marble, and chalk, which can be prepared by the precipitation from dissolved calcium hydroxide and carbon dioxide.

Zastosowanie

Calcium carbonate can be used as a precursor to prepare Pd/CaCO₃, which can be used as a catalyst:

• In Miyaura-Suzuki cross-coupling reactions.
• In the ligand-free Stille cross-coupling reaction between aryl halides and tributylphenyltin to synthesize biphenyls.

It can also be used as a base in the Pd-catalyzed regioselective Heck reaction of fluorinated haloaryls with olefins to synthesize substituted olefins.

Inne uwagi

Go to Redi-Dri^™ Product Listing 795445

Informacje prawne

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

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Informacja o środkach bezpieczeństwa

• Kod klasy składowania: 11 - Combustible Solids
• Klasa zagrożenia wodnego (WGK): nwg
• Temperatura zapłonu (°F): Not applicable
• Temperatura zapłonu (°C): Not applicable