Acetic Anhydride → Biphenyl

Participants

Reaction Steps

Dowtherm-A was heated in the presence of 2 wt. % acetic anhydride for 5 hours. The reflux temperature reached 235° C. Color formation appeared after one hour at 235° C. The yellow color gradually turned to yellowish-brown. This color did not seem to increase after this point. It is believed that acetic anhydride either reacted with Dowtherm-A to give acylated diphenyl ether and/or biphenyl or there was a degradation of the diphenyl ether into phenolic compounds.

Provenance & Evidence