Hanefeld, Ulf et al. published their research in Liebigs Annalen der Chemie in 1991 | CAS: 108940-96-1

3,5-Dibromo-4-methoxybenzaldehyde (cas: 108940-96-1) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. One prominent application of synthetic organobromine compounds is the use of polybrominated diphenyl ethers as fire-retardants, and in fact fire-retardant manufacture is currently the major industrial use of the element bromine.SDS of cas: 108940-96-1

Synthesis of isopentabromopseudilin was written by Hanefeld, Ulf;Laatsch, Hartmut. And the article was included in Liebigs Annalen der Chemie in 1991.SDS of cas: 108940-96-1 This article mentions the following:

Isopentabromopseudilin (I, R = OH, R1 = Br, R2 = H) and the analogs I (R = H, R1 = Br, R2 = OH; R = R2 = Br, R1 = OH) have been synthesized by base-catalyzed cyclization of substituted benzaldehydes with CNCH2CO2Me. In contrast to the highly antibiotic and cytotoxic active natural product pentabromopseudilin, I are inactive. In the experiment, the researchers used many compounds, for example, 3,5-Dibromo-4-methoxybenzaldehyde (cas: 108940-96-1SDS of cas: 108940-96-1).

3,5-Dibromo-4-methoxybenzaldehyde (cas: 108940-96-1) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. One prominent application of synthetic organobromine compounds is the use of polybrominated diphenyl ethers as fire-retardants, and in fact fire-retardant manufacture is currently the major industrial use of the element bromine.SDS of cas: 108940-96-1

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary