Methyl Cyanoacetate

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Appearance: Methyl cyanoacetate is a colorless to pale yellow, transparent liquid with a faint aromatic or characteristic odor.
Melting point: Approx. -13°C
Boiling point: 204–207°C (atmospheric pressure); 115°C / 4.8 kPa (reduced pressure)
Density: 1.122–1.123 g/cm³ (20°C)
Refractive index: n²⁰_D ≈ 1.417
Flash point: Closed-cup approx. 110°C (classified as a combustible liquid; not a low-flash-point flammable substance)
Solubility: Slightly soluble in water (approx. 54 g/L at 20°C); miscible with ethanol, diethyl ether, benzene, methanol, etc.
pKa: α-hydrogen approx. 2.75-much more reactive than typical esters; due to the dual electron-withdrawing effects of the –CN and –COOMe groups, the methylene group exhibits distinct acidity and can form a carbanion.

Active methylene chemistry: Undergoes deprotonation with weak bases (e.g., sodium alkoxides, NaH) and participates in Knoevenagel condensation (with aldehydes/ketones), Michael addition, and cyclization (forming heterocycles such as pyrimidines, thiophenes, and pyrazoles).
Cyano group transformations: Hydrolysis (yielding cyanoacetic acid or malonic acid derivatives); partial reduction (to amides); reaction with amines (forming cyanoacetamides).
Base sensitivity: Methyl cyanoacetate is susceptible to hydrolysis by strong bases or upon prolonged exposure to water or alkoxides; caution regarding high-temperature decomposition releasing HCN due to the –CN group.
Incompatible materials: Strong oxidizing agents, strong acids, acid chlorides, and acid anhydrides.

Esterification of cyanoacetic acid with methanol (mainstream method): H₂SO₄-catalyzed reflux followed by neutralization and vacuum rectification; offers high yields and a clean process route.
Cyanation of methyl chloroacetate with NaCN: Chloroacetic acid is first esterified to methyl chloroacetate, followed by an SN₂ substitution reaction with sodium cyanide; requires treatment of cyanide-containing wastewater but can leverage existing chloroacetic acid production facilities.
Transesterification: Ethyl cyanoacetate + methanol; base-catalyzed exchange reaction.

Instant adhesive monomer intermediates: Condensation with formaldehyde → poly(methyl 2-cyanoacrylate) → depolymerization to yield methyl α-cyanoacrylate (core component of "501" adhesive)
Pharmaceutical intermediates: Vitamin B₆, caffeine, buspirone, minoxidil, gabapentin, 2-aminothiophene carboxylates, etc.
Pesticide intermediates: Sulfonylurea herbicides, aminopyrimidines; synthesis of 2,4-diamino-6-hydroxy/chloropyrimidine
Dyes/Pigments: Azo dyes, Solvent Red 196, Cationic Yellow, etc.
Others: Precursors for UV absorbers/stabilizers, raw material for malononitrile production

Toxicity: Moderately toxic; absorbable through the skin. Oral LD₅₀ (guinea pig): 400–800 mg/kg; intraperitoneal LD₅₀ (mouse): ≈ 750 mg/kg; dermal LDLo (guinea pig): 400 mg/kg.
Irritation: Causes serious eye irritation (GHS Eye Irritation Category 2, H319); vapors irritate the respiratory tract; skin contact causes inflammation.
Cyanide-related risks: Does not release HCN under normal conditions, but hydrogen cyanide may be generated upon thermal decomposition or prolonged heating with strong acids/bases; managed as an organic cyanide compound.
Protection: Closed-system operations with local exhaust ventilation; use chemical-resistant gloves, safety goggles, and a half-face respirator (if exposure limits are exceeded); keep away from oxidizing agents, strong acids, and bases.
Firefighting: Alcohol-resistant foam, dry chemical, CO₂, sand/earth; firefighters require protective suits and self-contained breathing apparatus (SCBA).
Storage and transport: Store in a cool, well-ventilated area; keep tightly sealed and protected from light (slightly light-sensitive); store separately from food and other chemicals; handle as a flammable, toxic liquid; UN 3276 (Class 6.1, Packing Group III).

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