Bis(2,4-pentanedionato)vanadium(IV) oxide
Vanadyl(IV)-acetylacetonate
CAS: 3153-26-2
Molecular Formula: C10H14O5V
Bis(2,4-pentanedionato)vanadium(IV) oxide - Names and Identifiers
Bis(2,4-pentanedionato)vanadium(IV) oxide - Physico-chemical Properties
| Molecular Formula | C10H14O5V |
| Molar Mass | 265.16 |
| Density | 1,4 g/cm3 |
| Melting Point | 235°C (dec.)(lit.) |
| Boling Point | 140°C 13mm |
| Flash Point | 79 °C |
| Water Solubility | practically insoluble |
| Solubility | Moderately soluble in acetone, ether and chloroform. Soluble in ethanol and benzene |
| Vapor Presure | 0Pa at 20℃ |
| Appearance | Brown crystalline powder |
| Specific Gravity | 1.4 |
| Color | Green to blue-green |
| Exposure Limit | NIOSH: Ceiling 0.05 mg/m3 |
| BRN | 4138236 |
| Storage Condition | Store below +30°C. |
| Stability | Stable, but air sensitive. May discolour upon exposure to air. Incompatible with strong oxidizing agents. |
| Sensitive | 4: no reaction with water under neutral conditions |
| MDL | MFCD00000033 |
| Physical and Chemical Properties | Blue crystals. Almost insoluble in water, soluble in methanol (6.4g/100mL), ethanol, ether, chloroform, acetone, benzene (0.9g/100mL). Density: 1.4,UN32856.1/PG3 |
| Use | Used as an organic synthesis catalyst and resin curing accelerator. |
Bis(2,4-pentanedionato)vanadium(IV) oxide - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R22 - Harmful if swallowed R36/37/38 - Irritating to eyes, respiratory system and skin. R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. |
| Safety Description | S22 - Do not breathe dust. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. |
| UN IDs | 3285 |
| WGK Germany | 3 |
| TSCA | Yes |
| HS Code | 29420000 |
| Hazard Class | 6.1 |
| Packing Group | III |
Bis(2,4-pentanedionato)vanadium(IV) oxide - Introduction
Sensitive to air.
Last Update：2022-10-16 17:24:32
Bis(2,4-pentanedionato)vanadium(IV) oxide - Reference Information
| LogP | 0.4 at 20℃ |
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Overview | Vanadium acetylacetonate [VO(acac)2] is a common oxidation catalyst, which is combined with tert-butyl hydrogen peroxide (TBHP) and other oxidants in the reaction system to rapidly oxidize into homogeneous pentavalent vanadium compounds, which can effectively oxidize a variety of organic functional groups, such as tertiary amine oxidation to N-oxide, thioether oxidation to sulfoxide, the epoxidation of olefins and other reactions, especially can carry out regional and chiral oxidation. |
| use | vanadium acetylacetonate [VO(acac)2] is widely used as an oxidation catalyst, catalyst precursor, medicine, paint desiccant, pigment, etc. as a common organometallic compound. As an oxidation catalyst, vanadyl acetylacetonate can be combined with oxidants such as tert-butyl hydrogen peroxide to be quickly oxidized into homogeneous pentavalent vanadium compounds, thereby effectively oxidizing a variety of organic functional groups, such as the oxidation of amines to nitro and thioether Oxidation to sulfoxide, epoxidation of olefins and other reactions. It can be used as a catalyst and synthesis intermediate, as well as as a coating desiccant and pigment Oxidation catalyst in organic synthesis; metal surface treatment. |
| synthesis method | concentrated sulfuric acid, ethanol and vanadium pentoxide are used as raw materials. a large amount of concentrated sulfuric acid is used in the reaction process, which requires high equipment requirements and produces pollution with 71% yield. the specific process is as follows: the oxidation reaction Sharpless of double bonds is reported in non-polar solvents such as toluene or dichloroethane, tert-butyl hydrogen peroxide (t -BuOOH) and vanadyl acetylacetonate [VO( acac) 2] generated by the organic complex of vanadyl peroxide, the oxidation of allyl alcohol organics is ideal, the reaction is fast, the stereoselective, the conditions are mild and the yield is high. The following reactions confirm this mechanism, and also explain the superior performance of vanadium acetylacetonate as an oxidation promoter. The complex can also be prepared from tetravalent vanadium compounds, such as vanadium sulfate (IV): VOSO4 2Hacac→VO (acac)2 H2SO4 It can also be prepared by the redox reaction of vanadium pentoxide and acetylacetone. But a part of acetylacetone will be oxidized to acetic anhydride. |
Last Update：2024-04-10 22:29:15
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