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4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)thiophene-2-carbaldehyde; CAS No.: 881381-12-0; Thiophene-2-carbaldehyde boronic ester serves as a regioisomerically pure building block for thiophene-based semiconductors. The C2 substitution pattern directs polymer chain growth. As a worldwide chemical supplier, we ensure precise regiochemical control in these halogen-free coupling precursors.