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Isobutyl chloroformate

CAS Number
543-27-1
EC Number
208-840-1
Chemical Formula
C5H9ClO2
Molecular Weight
136.58 g/mol

Description

Isobutyl chloroformate (CAS 543-27-1 ), commonly abbreviated as IBCF, is a reactive acylating agent used across pharmaceutical synthesis, specialty chemical manufacturing, and flavor chemistry. It functions as an activated carbonyl intermediate, enabling efficient coupling and protection reactions under mild conditions. In pharmaceutical manufacturing, IBCF is the reagent of choice for mixed anhydride peptide coupling, where it activates carboxylic acids for amide bond formation in API synthesis. This process is essential for creating complex molecular structures in modern medicine. Flavor and fragrance producers use it to synthesize isobutyl esters that contribute characteristic fruity notes to food and cosmetic formulations. These esters are highly valued for their aromatic profiles and stability in various consumer products. In fine chemical synthesis, it serves as a protecting group reagent for amines and alcohols, a step critical in multi-stage synthesis routes where selectivity is required. This allows chemists to manipulate specific functional groups without affecting others. Specialty polymer and agrochemical manufacturers also employ it as a carbonylating agent to introduce chloroformate functionality into target molecules. This versatility makes it a staple in industrial laboratories and large-scale production facilities. Isobutyl chloroformate is supplied as a clear, moisture-sensitive liquid, typically packaged under inert atmosphere to preserve reactivity. Proper handling and storage are necessary to maintain the chemical integrity of the product over time. It is available in technical and synthesis grades, with purity specifications commonly ranging from 97% to 99%+ for research and industrial use. These grades ensure that the material meets the rigorous demands of high-precision chemical engineering. Packaging options generally include small reagent quantities through to bulk drums for commercial-scale production. This flexibility allows suppliers to meet the needs of both small laboratory trials and large industrial manufacturing cycles. Contact us for supply of Isobutyl chloroformate Request Quote

Other Names (Synonyms)

2-Methylpropyl chloroformate | 2-Methylpropyl carbonochloridate | Isobutyl chlorocarbonate | Chloroformic acid isobutyl ester | CARBONOCHLORIDIC ACID, 2-METHYLPROPYL ESTER | Chlorocarbonic acid isobutyl ester | 6S785TC0OB | IBCF

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point138-140 °C
Boiling Point128-129 °C
Density1.053 g/mL at 25 °C(lit.)
Flash Point82 °F
AppearanceA combustible, colorless to light-colored liquid.
ColorClear
FormLiquid
Water SolubilityImmiscible with water.
Vapor Pressure0.33 mm Hg ( 20 °C)
Refractive Indexn 20/D 1.407(lit.)

Safety & Handling

Danger
GHS02· FlammableGHS05· CorrosiveGHS06· ToxicGHS07· Irritant

Hazard Statements

H226Flammable liquid and vapor
H290May be corrosive to metals
H302Harmful if swallowed
H314Causes severe skin burns and eye damage
H318Causes serious eye damage
H331Toxic if inhaled
H335May cause respiratory irritation

Precautionary Statements

P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233Keep container tightly closed.
P234Keep only in original packaging.
P240Ground and bond container and receiving equipment.
P241Use explosion-proof equipment.
P242Use non-sparking tools.
P243Take action to prevent static discharges.
P260Do not breathe dust/fume/gas/mist/vapours/spray.
P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P264Wash … thoroughly after handling.
P270Do not eat, drink or smoke when using this product.
P271Use only outdoors or in a well-ventilated area.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P316Get emergency medical help immediately.
P317Get emergency medical help.
P319Get medical advice/attention if you feel unwell.
P321Specific treatment (see … on this label).
P330Rinse mouth.
P363Wash contaminated clothing before reuse.
P390Absorb spillage to prevent material damage.
P405Store locked up.
P406Store in a corrosion-resistant/… container with a resistant inner liner.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P317Get emergency medical help.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P378Use … for extinction.
P233Store in a well-ventilated place. Keep container tightly closed.
P235Store in a well-ventilated place. Keep cool.
P331Rinse mouth. Do NOT induce vomiting.
P354IF ON SKIN: Take off immediately all contaminated clothing. Rinse skin with water/shower.
P353IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code29159000
UN Number3390
ADR Class6.1
Packing GroupI
Storage Class3 - Flammable liquids
WGK (Germany)2