239216

Carbonate de calcium

ACS reagent, ≥99.0%, powder

• Formule linéaire : CaCO₃
• Numéro CAS: 471-34-1
• Poids moléculaire : 100.09
• Numéro Beilstein : 8008338
• Numéro CE : 207-439-9
• Numéro MDL: MFCD00010906
• Code UNSPSC : 12352300
• ID de substance PubChem : 329752519
• Nomenclature NACRES : NA.21

Propriétés

• Qualité: ACS reagent
• Niveau de qualité: 200
• Pureté: ≥99.0%
• Forme: powder
• Impuretés: ≤0.002 meq/g water-soluble titr. base; ≤0.005% oxidizers; ≤0.01% NH₄OH pptd.; ≤0.01% insol. dil. HCl
• pH: 8
• Densité: 2.93 g/mL at 25 °C (lit.)
• Traces d'anions: chloride (Cl^-): ≤0.001%; fluoride (F^-): ≤0.0015%; sulfate (SO₄^2-): ≤0.01%
• Traces de cations: 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)
• Chaîne SMILES: [Ca++].[O-]C([O-])=O
• InChI: 1S/CH2O3.Ca/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2
• Clé InChI: VTYYLEPIZMXCLO-UHFFFAOYSA-L

Description

Description générale

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.

Application

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.

Autres remarques

Go to Redi-Dri^™ Product Listing 795445

Informations légales

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

Informations sur la sécurité

• Code de la classe de stockage: 13 - Non Combustible Solids
• Classe de danger pour l'eau (WGK): nwg
• Point d'éclair (°F): Not applicable
• Point d'éclair (°C): Not applicable