Synthesis of Chromans via [3 + 3] Cyclocoupling of Phenols with Allylic Alcohols Using a Mo/o-Chloranil Catalyst System

The combination of a molybdenum complex (CpMoCl(CO)₃ or [CpMo(CO)₃]₂) and o-chloranil was used as a catalyst in the [3 + 3] cyclocoupling of phenols and allylic alcohols under microwave heating conditions. Substituted chromans were selectively obtained in moderate to good isolated yields.