239216

Calciumcarbonat

ACS reagent, ≥99.0%, powder

• Lineare Formel: CaCO₃
• CAS-Nummer: 471-34-1
• Molekulargewicht: 100.09
• Beilstein: 8008338
• EG-Nummer: 207-439-9
• MDL-Nummer: MFCD00010906
• UNSPSC-Code: 12352300
• PubChem Substanz-ID: 329752519
• NACRES: NA.21

Eigenschaften

• Qualität: ACS reagent
• Qualitätsniveau: 200
• Assay: ≥99.0%
• Form: powder
• Verunreinigungen: ≤0.002 meq/g water-soluble titr. base; ≤0.005% oxidizers; ≤0.01% NH₄OH pptd.; ≤0.01% insol. dil. HCl
• pH-Wert: 8
• Dichte: 2.93 g/mL at 25 °C (lit.)
• Anionenspuren: chloride (Cl^-): ≤0.001%; fluoride (F^-): ≤0.0015%; sulfate (SO₄^2-): ≤0.01%
• Kationenspuren: 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)
• SMILES String: [Ca++].[O-]C([O-])=O
• InChI: 1S/CH2O3.Ca/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2
• InChIKey: VTYYLEPIZMXCLO-UHFFFAOYSA-L

Beschreibung

Allgemeine Beschreibung

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.

Anwendung

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.

Sonstige Hinweise

Go to Redi-Dri^™ Product Listing 795445

Rechtliche Hinweise

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

Sicherheitshinweise

• Lagerklassenschlüssel: 11 - Combustible Solids
• WGK: nwg
• Flammpunkt (°F): Not applicable
• Flammpunkt (°C): Not applicable