反应详情

2,3,3′,4′-Biphenyltetracarboxylic acid (4) (33 gm, 100 mmol) was suspended in minimum amount of acetic anhydride and heated to reflux for 4 hours. The reaction mixture was cooled to room temperature. The corresponding dianhydride precipitated out and was collected and washed with ether to remove trace of acetic acid before drying under vacuum to afford 26.5 g (90%) of a-BPDA. Mp=195-196° C.

1. temperatureheated
2. temperatureto reflux for 4 hours
3. customThe corresponding dianhydride precipitated out
4. customwas collected
5. washwashed with ether
6. customto remove trace of acetic acid
7. custombefore drying under vacuum