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A High-Yield Method for the Methylenation of o-Dihydroxyaromatic Compounds: Synthesis of Methylenedioxycoumarins
  
P. Castillo*, J. C. Rodriguez-Ubis, F. Rodriguez
*Departamento de; Qu¨ªmica Org¨¢nica, Universidad Autonoma de Madrid, Cantoblanco, E-28049 Madrid, Spain

Reaction of o-dihydroxycoumarins and catechols with sodium hydride in hexamethylphosphoric triamide and dihalomethane provides the corresponding methylenedioxy compounds under mild conditions and in excellent yields.
  

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