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2-(4-bromo-phenyl)-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane; CAS No.: 68716-49-4; 4-Bromophenyl boronic ester exemplifies our halogenated coupling partners for sequential cross-coupling. The bromine enables Negishi or Stille reactions post Suzuki coupling. Through custom synthesis services, we enable complex polycyclic assembly through iterative metal-mediated reactions.