8.05958

Manganese(IV) oxide

(precipitated active) for synthesis

• Synonym(e): Manganese(IV) oxide, Manganese dioxide, Pyrolusite
• Empirische Formel (Hill-System): MnO₂
• CAS-Nummer: 1313-13-9
• Molekulargewicht: 86.94
• MDL-Nummer: MFCD00003463
• UNSPSC-Code: 12352303
• EG-Index-Nummer: 215-202-6
• NACRES: NA.22

Eigenschaften

• Qualitätsniveau: 200
• Form: powder
• Wirksamkeit: >3478 mg/kg LD₅₀, oral (Rat)
• Eignung der Reaktion: reagent type: oxidant
• Löslichkeit: insoluble <0.001 g/L
• Dichte: 5.21 g/cm³ at 21 °C
• Schüttdichte: 600‑800 kg/m³
• Lagertemp.: 2-30°C
• InChI: 1S/Mn.2O
• InChIKey: NUJOXMJBOLGQSY-UHFFFAOYSA-N

Beschreibung

Anwendung

Manganese(IV) oxide (MnO₂) can be used as an oxidizing agent for the oxidation of:

• Allylic alcohols to α, β-ethylenic aldehydes, or ketones.
• Propargylic alcohols to alkynic aldehydes or ketones.
• Benzylic and heterocyclic alcohols to conjugated aromatic aldehydes or ketones.
• Amines to aldehydes, imines, amides, and diazo compounds. Methyl arenes to form primary amides in the presence of urea and oxygen.
• MnO₂ can also be used to synthesize disubstituted oxazolines from aldoximes via in situ nitrile oxide formation. Non-activated cyclic and acyclic alcohols oxidized to ketone analogs using stoichiometric MnO₂ and a ruthenium catalyst.

Hinweis zur Analyse

Gehalt (iodometrisch, ber. auf getrocknete Substanz): ≥ 90.0 %
Trocknungsverlust: ≤ 3.5 %
Oxidationsaktivität: entspricht

Sicherheitshinweise

• Piktogramme: GHS07,GHS08
• Signalwort: Warning
• H-Sätze: H302 + H332 - H373
• P-Sätze: P260 - P264 - P270 - P301 + P312 - P304 + P340 + P312 - P314
• Gefahreneinstufungen: Acute Tox. 4 Inhalation - Acute Tox. 4 Oral - STOT RE 2 Inhalation
• Zielorgane: Brain
• Lagerklassenschlüssel: 13 - Non Combustible Solids
• WGK: WGK 1
• Flammpunkt (°F): does not flash
• Flammpunkt (°C): does not flash