In the procedure for the synthesis of N-anisoyl-2-pyrrolidinone that was given to me, it is written that when triethylamine is added, a "fog" is observed inside the flask.
Triethylamine is added to neutralize the hydrochloric acid that is generated during the reaction, forming triethylammonium chloride.
I searched for similar procedures involving an acyl chloride and an amine, but the formation of a "fog" is never mentioned. A quick search on the internet gave me no clue. In my experience I have never witnessed the formation of a "fog" with this kind of reactions.
Since I cannot enter the lab due to the COVID-19 restrictions, I cannot perform the reaction now, can someone help me to understand if and possibly why in this case a "fog" is formed?