4-Chlorobutyric acid
4-Chlorobutyric acid (CAS: 627-00-9) is a halogenated carboxylic acid with the linear formula Cl(CH<sub>2</sub>)<sub>3</sub>COOH and a molecular weight of 122.55 g/mol. This compound serves as a valuable building block in organic synthesis. It is commonly employed in the preparation of pharmaceuticals, agrochemicals, and other fine chemicals, facilitating the introduction of a four-carbon chain with a terminal acid functionality and a reactive chlorine atom.

Organic Synthesis Intermediate
4-Chlorobutyric acid is a versatile intermediate used in various chemical transformations. Its bifunctional nature allows for reactions at both the carboxylic acid group and the alkyl chloride moiety, making it useful for constructing complex molecules.
Pharmaceutical Precursor
This compound is utilised in the synthesis of active pharmaceutical ingredients (APIs). It can be incorporated into molecular structures to form key intermediates for a range of therapeutic agents.
Agrochemical Synthesis
The chemical structure of 4-Chlorobutyric acid lends itself to the development of new agrochemicals. It can be a starting material or intermediate in the production of pesticides, herbicides, or plant growth regulators.
| Molecular weight | 122.55 |
|---|---|
| Linear formula | Cl(CH2)3COOH |
| Assay | 99% |
| Boiling point | 196 °C/22 mmHg(lit.) |
| Density | 1.24 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.451(lit.) |
| Melting point | 12-16 °C(lit.) |


Hazard statements
- H302Harmful if swallowed
- H314Causes severe skin burns and eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Faceshields, full-face respirator (US), Gloves, Goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 113 °C / 235.4 °F |
| Transport (UN / ADR) | UN 3265 8 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | C |
| Risk statements (R) | 22-34 |
| Safety statements (S) | 26-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 4-Chlorobutyric acid used for?
+
4-Chlorobutyric acid is primarily used as a building block and intermediate in organic synthesis, particularly in the preparation of pharmaceuticals and agrochemicals.
What is the CAS number and formula for 4-Chlorobutyric acid?
+
The CAS number for 4-Chlorobutyric acid is 627-00-9, and its linear formula is Cl(CH<sub>2</sub>)<sub>3</sub>COOH.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies 4-Chlorobutyric acid with an assay of 99%. This product is typically considered a research or technical grade; TSS does not represent it as USP, BP, or EP grade.
How should 4-Chlorobutyric acid be handled safely?
+
4-Chlorobutyric acid is classified as Danger (GHS05, GHS07) and causes severe skin burns and eye damage (H314) and is harmful if swallowed (H302). Appropriate personal protective equipment, including gloves, goggles, and a respirator, should be worn. Handle in a well-ventilated area and avoid contact with skin, eyes, and clothing.
How is 4-Chlorobutyric acid packed and shipped?
+
4-Chlorobutyric acid is shipped as a UN 3265, Class 8, Packing Group II corrosive material. Packaging is suitable for international export, adhering to all relevant transport regulations.
How can I request a quote or sample for 4-Chlorobutyric acid?
+
To request a quote or sample of 4-Chlorobutyric acid, please use the contact form on our website or call our sales department, quoting the CAS number 627-00-9.
▶ Related products

1-(2-Fluorobenzyl)piperazine
C11H15FN2
Chemical Synthesis
1-(2-Fluorophenyl)biguanide hydrochloride
Chemical Synthesis

1-(2-Fluorophenyl)cyclopropanecarboxylic acid
C10H9FO2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine
C10H13FN2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine monohydrochloride
C10H13FN2 · HCl
Chemical Synthesis
1-(2-Furoyl)-1H-benzotriazole
C11H7N3O2
Chemical Synthesis
1-(2-Furoyl)piperazine
C9H12N2O2
Chemical Synthesis
1-(2-Hydroxy-5-methylphenyl)-3-phenyl-1,3-propanedione
Chemical Synthesis
▶ Explore more

3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis

3-Methyl-1,5-pentanediol
Chemical Synthesis

3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis