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5-(methoxycarbonyl)thiophen-2-ylboronic acid; CAS No.: 876189-21-8; As a chemical synthesis company, ChemShuttle offers ester-functionalized thiophene boronates for conjugated polymer synthesis. The methoxycarbonyl group directs cross-coupling regiochemistry while the boronate enables chain extension. Our process optimization ensures compatibility between ester and boronate functionalities in these air-sensitive intermediates.