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2-(5-chlorothiophen-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane; CAS No.: 635305-24-7; 5-Chlorothiophene boronic ester demonstrates our meta-substituted thiophene reagents for non-linear conjugation systems. The chlorine at C5 creates twisted -systems in conjugated polymers. ChemShuttle, as chemical synthesis companies, provides these building blocks for organic photovoltaic research.