Schwiderski, Ryan L. published the artcileSynthesis and Characterization of Thieno[3,4-b]pyrazine-Based Terthienyls: Tunable Precursors for Low Band Gap Conjugated Materials, Synthetic Route of 52431-30-8, the publication is Journal of Organic Chemistry (2013), 78(11), 5453-5462, database is CAplus and MEDLINE.
Synthetic methods have been developed for the preparation of new 2,3-dihalo- and 2,3-ditriflato-5,7-bis(2-thienyl)thieno[3,4-b]pyrazines. From these reactive intermediates, a variety of new 2,3-difunctionalized 5,7-bis(2-thienyl)thieno[3,4-b]pyrazines have been produced as precursors to conjugated materials. Structural, electronic, and optical characterization of these new analogs illustrate the extent to which the electronic nature of the functional groups can be used to tune the electronic properties of these thieno[3,4-b]pyrazine-based terthienyl units.
Journal of Organic Chemistry published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C9H22OSi, Synthetic Route of 52431-30-8.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary