2-chlorobenzaldehyde

CAS: 89-98-5

Overview

2-Chlorobenzaldehyde (CAS 89-98-5 ), also known as o-chlorobenzaldehyde, is an aromatic aldehyde used as a reactive intermediate in the synthesis of pharmaceuticals, agrochemicals, and specialty dyes.

Its chloro-substituted structure makes it a valued building block where precise reactivity at the aldehyde and ring positions drives downstream synthesis efficiency in various chemical processes.

In pharmaceutical manufacturing, it serves as a key precursor in the synthesis of active ingredients, including antihistamines and antimicrobial compounds for the healthcare sector.

Dye and pigment producers use it to construct azo and triarylmethane colorants applied in textile and paper dyeing processes, ensuring high-quality results for industrial applications.

In printing and packaging, it contributes to the formulation of specialty inks where reactive intermediates determine color fastness and substrate adhesion for commercial use.

It also functions as a biocide intermediate, incorporated into preservation systems for leather treatment and industrial process fluids to maintain product integrity and safety.

The product is supplied as a clear to pale yellow liquid in standard commercial packaging, including drums and IBC containers for bulk orders and large-scale distribution.

Technical grade is the primary specification, with purity levels typically at 98% or higher as confirmed by GC analysis to meet rigorous industrial manufacturing requirements.

Physical Properties

Melting Point	12.39 °C
Boiling Point	211.9 °C @ Press: 760 Torr
Density	1.2483 g/cm³ @ Temp: 20 °C
Flash Point	190 °F
Appearance	colourless to brown liquid
Color	Clear colorless to light yellow
Odor	Penetrating odor
Form	Liquid
Water Solubility	0.1-0.5 g/100 mL at 24 ºC
Vapor Pressure	1.27 mm Hg ( 50 °C)
Refractive Index	n 20/D 1.566(lit.)
pH	2.9 (H2O)(saturated aqueous solution)
Log P	2.44 at 25℃

Safety & Handling

Danger GHS05 GHS07 GHS09 Hazard Statements H227 Combustible liquid H302 Harmful if swallowed H314 Causes severe skin burns and eye damage H317 May cause an allergic skin reaction H318 Causes serious eye damage H411 Toxic to aquatic life with long lasting effects H412 Harmful to aquatic life with long lasting effects Precautionary Statements P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P321 Specific treatment (see … on this label). P330 Rinse mouth. P363 Wash contaminated clothing before reuse. P391 Collect spillage. P403 Store in a well-ventilated place. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P333+P317 Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P370+P378 Use … for extinction. P301+P330+P331 Rinse mouth. Do NOT induce vomiting. P302+P361+P354 IF ON SKIN: Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code	29130000
UN Number	3265
ADR Class	8
Packing Group	III
Storage Class	8A - Combustible corrosive hazardous materials
WGK (Germany)	1

Other Names

Industries

Printing & Packaging Textile, Leather & Paper Pharmaceuticals & Healthcare