3,6-diphenylfuro[3,2-b]furan-2,5-dione

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pulvinic acid (19.0 g., 0.0616 mol.) was refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution was stirred into 1200 ml. of ice and water and the oily mass was crystallized by stirring in 500 ml. of ethanol. The yellow solid was removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5°-223°. of ice and water and the oily mass was crystallized by stirring in 500 ml The yellow solid was removed washed with ethanol dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pulvinic acid (19.0 g., 0.0616 mol.) was refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution was stirred into 1200 ml. of ice and water and the oily mass was crystallized by stirring in 500 ml. of ethanol. The yellow solid was removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5°-223°. of ice and water and the oily mass was crystallized by stirring in 500 ml The yellow solid was removed washed with ethanol dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pulvinic acid (19.0 g., 0.0616 m.) is refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution is stirred into 1200 ml. of ice and water and the oily mass crystallized by stirring in 500 ml. of ethanol. The yellow solid is removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5° -223° C. of ice and water and the oily mass crystallized by stirring in 500 ml The yellow solid is removed washed with ethanol dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pulvinic acid (19.0 g., 0.0616 m.) is refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution is stirred into 1200 ml. of ice and water and the oily mass crystallized by stirring in 500 ml. of ethanol. The yellow solid is removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5° -223° C. of ice and water and the oily mass crystallized by stirring in 500 ml The yellow solid is removed washed with ethanol dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pulvinic acid (19.0 g., 0.0616 mol.) was refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution was stirred into 1200 ml. of ice and water and the oily mass was crystallized by stirring in 500 ml. of ethanol. The yellow solid was removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5°-223°. of ice and water and the oily mass was crystallized by stirring in 500 ml The yellow solid was removed washed with ethanol dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pulvinic acid (19.0 g., 0.0616 m.) is refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution is stirred into 1200 ml. of ice and water and the oily mass crystallized by stirring in 500 ml. of ethanol. The yellow solid is removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5° -223° C. of ice and water and the oily mass crystallized by stirring in 500 ml The yellow solid is removed washed with ethanol dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pulvinic acid (19.0 g., 0.0616 m.) is refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution is stirred into 1200 ml. of ice and water and the oily mass crystallized by stirring in 500 ml. of ethanol. The yellow solid is removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5° -223° C. of ice and water and the oily mass crystallized by stirring in 500 ml The yellow solid is removed washed with ethanol dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pulvinic acid (19.0 g., 0.0616 mol.) was refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution was stirred into 1200 ml. of ice and water and the oily mass was crystallized by stirring in 500 ml. of ethanol. The yellow solid was removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5°-223°. of ice and water and the oily mass was crystallized by stirring in 500 ml The yellow solid was removed washed with ethanol dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pulvinic acid (19.0 g., 0.0616 mol.) was refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution was stirred into 1200 ml. of ice and water and the oily mass was crystallized by stirring in 500 ml. of ethanol. The yellow solid was removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5- 223°. of ice and water and the oily mass was crystallized by stirring in 500 ml The yellow solid was removed washed with ethanol dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pulvinic acid (19.0 g., 0.0616 mol.) was refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution was stirred into 1200 ml. of ice and water and the oily mass was crystallized by stirring in 500 ml. of ethanol. The yellow solid was removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5°-223°. of ice and water and the oily mass was crystallized by stirring in 500 ml The yellow solid was removed washed with ethanol dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Pulvinic acid (19.0 g., 0.0616 m.) is refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution is stirred into 1200 ml. of ice and water and the oily mass crystallized by stirring in 500 ml. of ethanol. The yellow solid is removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5° -223° C. of ice and water and the oily mass crystallized by stirring in 500 ml The yellow solid is removed washed with ethanol dried