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| CAS No.: | 78-84-2 |
| Formula: | C4h8o |
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1. Fundamental Identifiers
IUPAC Name: 2-Methylpropanal
Common Names:Isobutyraldehyde
Isobutanal
CAS Registry Number: 78-84-2
EC Number: 201-149-6
UN Number: 2045 (Class 3, Flammable Liquid)
Molecular Weight: 72.11 g/mol
2. Structural & Chemical Profile
Chemical Class: Aliphatic aldehyde (a branched-chain C4 aldehyde).
Key Feature: A highly reactive carbonyl compound. The aldehyde group is susceptible to oxidation, reduction, nucleophilic addition (e.g., Grignard reactions, aldol condensation), and reductive amination.
3. Physical Properties
Appearance: Clear, colorless, mobile liquid.
Odor: Pungent, characteristic aldehyde odor.
Boiling Point: 63-64 °C
Melting Point: -65 °C
Flash Point: -18 °C (closed cup) - Highly Flammable
Density: 0.79 g/cm³ at 20°C (lighter than water)
Vapor Pressure: 157 hPa at 20°C - Highly Volatile
Solubility:Slightly soluble in water (~11 g/L at 20°C).
Miscible with most organic solvents (alcohols, ethers, benzene).
| Item | Specifications |
| Appearance | Colorless liquid,No visible impurities |
| Purity | 99.2% Min |
| Chroma(Hazen) | 10 Max |
| Density(20ºC,g/cm3) | 0.786-0.790 |
| N-butyraldehyde | 0.26% Max |
| Water | 0.3% Max |
| Isobutyric acid | 0.3% Max |
| Fe(mg/L) | 1 |
1. Bulk Chemical Intermediate (Major Use):
Neopentyl Glycol (NPG): Via aldol condensation with formaldehyde. NPG is a key monomer for high-performance unsaturated polyester resins used in coatings and plastics.
Methyl Methacrylate (MMA): Via oxidation/esterification processes (an alternative to the acetone cyanohydrin route). MMA is the monomer for poly(methyl methacrylate) (PMMA, acrylic glass).
Isobutanol & Isobutyric Acid: Produced by hydrogenation and oxidation, respectively. These serve as solvents, fuel additives, and intermediates for esters.
2. Fine Chemical Intermediate:
Amino Acids: Key precursor for the synthesis of valine and leucine.
Fragrances & Flavors: Used to synthesize esters like isobutyl isobutyrate (fruity odor).
Agrochemicals: Intermediate for certain pesticides and herbicides.
3. Miscellaneous Uses:
Rubber Chemicals: Production of vulcanization accelerators and antioxidants.
Solvent: Limited use as a specialty solvent.
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