Anderson, J. E. published the artcileIntrinsic asymmetry. Its effect on the chemical shift of groups which are not diastereotopic, SDS of cas: 594-81-0, the publication is Tetrahedron (1976), 32(22), 2789-93, database is CAplus.
The effect was determined of intrinsic asym. on the chem. shifts of Me2CRCMe2R1 (R = H, R1 = Cl, Br, I; R1 = R2 = Cl, Br, I, CN, Ph, 3-ClC6H3, Et, Me3CCH2; R = I, R1 = 4-MeOC6H4), in which rotation is slow on the NMR timescale. When R = R1 = alkyl or diamagnetically anisotropic Ph groups the intrinsic asym. shifts are very small. When either R or R1 is a halogen atom substantial intrinsic asym. shifts were observed; I > Br > Cl. The effect of 2 C-halogen bonds compared with one C-halogen and one C-H bond is inconsistent; 2 C-Cl bonds gave no shift, 2 C-Br bonds gave a reduced shift, and 2 C-I bonds gave an enhanced shift. The effect is tentatively linked to bond polarizability.
Tetrahedron published new progress about 594-81-0. 594-81-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 2,3-Dibromo-2,3-dimethylbutane, and the molecular formula is C6H12Br2, SDS of cas: 594-81-0.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary