Vershinin, S. S. published the artcileStereochemical aspect of 2,2,4-trimethyl-1,3-dioxolane bromination by molecular bromine, Synthetic Route of 1193-11-9, the publication is Bashkirskii Khimicheskii Zhurnal (2015), 22(1), 92-95, database is CAplus.
Bromination of 2,2,4-trimethyl-1,3-dioxolane by mol. bromine in carbon tetrachloride with molar ratio of dioxolane:Br2:CCl4 equal to 1:1:5 at the boiling temperature of the reaction mixture occurs regio- and stereoselectively with full conversion of the substrate to 61% of cis-2-bromomethyl-2,4-dimethyl-1,3-dioxolane and 39% of trans-2-bromomethyl-2,4-dimethyl-1,3-dioxolane. The structure, configuration, and the molar ratio of the isomers were determined by 1H and 13C NMR and gas chromatog. The predominant conformation of the obtained bromodioxolanes is half-chair with pseudoequatorial position of the CH3-group at carbon atom C-4 with prevalence of the cis-isomer with equatorial orientation of the bromoalkyl substitute.
Bashkirskii Khimicheskii Zhurnal published new progress about 1193-11-9. 1193-11-9 belongs to dioxole, auxiliary class Dioxolanes, name is 2,2,4-Trimethyl-1,3-dioxolane, and the molecular formula is C9H12O, Synthetic Route of 1193-11-9.
Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem