Koide, Tsutomu published the artcilePhase transition of the solid phase of 2,2-dibromo-3,3-dimethylbutane and 2,3-dibromo-2,3-dimethylbutane, Formula: C6H12Br2, the publication is Nippon Kagaku Kaishi (1973), 214-19, database is CAplus.
The phase transition temperature of Br2MeC-CMe3 (I) was -59° by DTA. High values of the dielec. constant were observed in the high temperature solid Phase, although in the low tem. phase it was low. The ir spectra showed no remarkable change at temperatures both above and below the phase transition. An x-ray study showed that the crystal structure at room temperature was a body centered cubic lattice with A 7.71 Å and Z = 2. From comparisons between symmetries of the mol. and the crystal, it was concluded that the mol. axis should run parallel to each of the 4 body-diagonals of the unit cell with equal statistical weight and that the C-C axis at the same time acquired at least a statistical symmetry of 3. Reinvestigation of the mol. from BrMe2C-CMe2Br (II) was done by the spectroscopic method. Only the transformed mol. existed in the solid phase II (-89 ∼ 90°) and in CCl4 solution Mechanism of the phase transtions for these 2 crystals was studied from an entropy anal., for I, the statistical orientation of the mol. mentioned above and the intramol rotation should occur at the transition point. At the lower transition point (-89°) of II, the mol. should have the orientational freedom which satisfied a statistical symmetry 4 about the Br… Br mol. axis.
Nippon Kagaku Kaishi 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, Formula: C6H12Br2.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary