3,4-Dichlorobenzaldehyde: name and identification

2 min

3,4-Dichlorobenzaldehyde: an explanation of the name and catalogue data, with guidance on distinguishing variants and checking documentation.

How to read the name

“3,4-Dichlorobenzaldehyde” is recorded in the OCA catalogue under number 6287-38-3. Preserving the full name is important because the catalogue contains many similarly named aromatic derivatives. The initial notation 3,4 specifies the positions of the substituents named afterwards. Removing these numbers loses information about compound structure.

Reference record

A distinction that matters

Fluoro, chloro and bromo describe different atoms substituting the ring. Replacing one of these fragments is not a language correction; it changes the substance identified. This interprets nomenclature; it does not predict a particular sample’s melting point, solubility or reactivity.

What the catalogue establishes and what remains unconfirmed

For 3,4-Dichlorobenzaldehyde, the listing is a starting point for identification, not a test certificate for the supplied batch. Read the purity result together with its method and batch number. A required water content, impurity profile or physical parameter needs its own specification entry. We do not add these values based on a similar isomer.

Similar notation, separate catalogue item

The formula C7H4Cl2O also appears in the “2,3-Dichlorobenzaldehyde” listing. The molecular formula alone should therefore not be the sole search key. Compare full names and identifiers before merging documentation. A shared formula does not prove identical properties or product interchangeability.

2,3-Dichlorobenzaldehyde

Sources and catalogue variants

3,4-Dichlorobenzaldehyde

Editorial material based on the OCA catalogue checked on 31 October 2026. Product data remain catalogue claims. This article does not replace the current specification, certificate of analysis or manufacturer’s instructions.