500mL unjacketed reaction vessel made of borosilicate glass to accomm ODate ACE 7854, 7856, or 7857 immersion wells. Vessel has one 14/20 angled joint for sparger tube, one 24/40 vertical joint for condenser, and one #7 Ace-Thred side arm for a thermometer. Center joint is 60/40, and the bottom of the reactor is flat to allow use of a stir magnet.