4-Bromo-1,8-naphthalic anhydride

4-Bromo-1,8-naphthalic anhydride (CAS 81-86-7, EC 201-382-3, formula C12H5BrO3) is an aromatic dicarboxylic anhydride derived from naphthalene, carrying a bromine substituent at the 4-position. It is also referred to commercially as 4-bromonaphthalic anhydride. No E-code designation applies to this substance.

In textile and plastics applications, this compound serves as a reactive intermediate for synthesising naphthalimide-based fluorescent dyes and pigments, where the bromine atom acts as a leaving group enabling nucleophilic substitution to introduce chromophoric functionality. In printing and packaging, it contributes to photoinitiator systems and polymer-bound colorant structures that require controlled light absorption profiles.

This material is supplied under REACH compliance for the European market and is available in solid form in standard laboratory and industrial packaging quantities. Buyers should confirm purity grade requirements prior to ordering, as specifications vary between research-grade and technical-grade batches.