Nakamura, Karin published the artcileFacile preparation of poly(3-substituted thiophene) block copolymers by nickel-catalyzed deprotonative polycondensation without external generation of thiophene organometallic species, HPLC of Formula: 303734-52-3, the publication is Chemistry Letters (2013), 42(10), 1200-1202, database is CAplus.
Thiophene-based block copolymers are synthesized by addition of bromothiophene and the Knochel-Hauser base (TMPMgCl.LiCl). Ni-catalyzed deprotonative C-H coupling polycondensation of 3-substituted-thiophenes gives head-to-tail-type poly(3-substituted thiophen-2,5-diyl) bearing Ni at the polymer end. Block copolymers of thiophene derivatives are obtained by successive addition of 2-bromo-3-alkylthiophene and Mg amide to a living polythiophene end. The use of Ni catalyst bearing an o-tolyl group gives the tolyl-group-terminated thiophene diblock copolymers in high efficiency. Triblock copolymer is also synthesized by the iterative addition of bromothiophene and TMPMgCl.LiCl.
Chemistry Letters published new progress about 303734-52-3. 303734-52-3 belongs to bromides-buliding-blocks, auxiliary class Thiophene,Bromide, name is 2-Bromo-3-(2-ethylhexyl)thiophene, and the molecular formula is C12H19BrS, HPLC of Formula: 303734-52-3.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary