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2-(5-bromothiophen-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane; CAS No.: 676501-84-1; 5-Bromothiophene boronic ester combines halogen and boronic ester for iterative cross-coupling. The bromine enables subsequent functionalization after initial coupling. Through our Library of Compounds platform, researchers access these sequentially reactive building blocks for dendritic macromolecule synthesis.