Thionyl Chloride → 4,9-Bis(ethyloxy)naphtho[2,3-c]furan-1,3-dione

Participants

Reaction Steps

1,4-Diethoxy-2,3-naphthalenedicarboxylic acid (25 g, 82 mmol) was added to a solution of thionyl chloride (23.3 g) in chloroform (150 ml) and stirred at reflux for 1 h. The resulting solution was cooled and evaporated to dryness. Further chloroform was added and evaporation repeated to give the title compound as a yellow solid (23.3 g, 99%).

Provenance & Evidence