2,2′-Biphenols via Protecting Group-Free Thermal or Microwave-Accelerated Suzuki–Miyaura Coupling in Water

User-friendly protocols for the protecting group-free synthesis of 2,2′-biphenols via Suzuki–Miyaura coupling of <i>o</i>-halophenols and <i>o</i>-boronophenol are presented. The reactions proceed in water in the presence of simple additives such as K₂CO₃, KOH, KF, or TBAF and with commercially available Pd/C as precatalyst. Expensive or laboriously synthesized ligands or other additives are not required. In the case of bromophenols, efficient rate acceleration and short reaction times were accomplished by microwave irradiation