Gadelle, Andree et al. published their research in Angewandte Chemie in 1991 | CAS: 53784-83-1

Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin (cas: 53784-83-1) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents. 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.Name: Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin

Selective halogenation of cyclic maltose oligosaccharides in the C-6 position and synthesis of per(3,6-anhydro) cyclic maltose oligosaccharides was written by Gadelle, Andree;Defaye, Jaques. And the article was included in Angewandte Chemie in 1991.Name: Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin This article mentions the following:

Cyclic maltose oligosaccharides were treated with PPh3 and iodine (or bromine) to give the per-6-deoxy-6-halo derivatives Treatment of per(6-deoxy-6-iodo) cyclic maltose oligosaccharide with aqueous NaOH gave the per(3,6-anhydro) derivatives In the experiment, the researchers used many compounds, for example, Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin (cas: 53784-83-1Name: Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin).

Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin (cas: 53784-83-1) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents. 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.Name: Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary