The mixture is stirred for from {HEAD ~ 6 to 24 hours} at room temperature to complete {TAIL ~ the reaction} 
The mixture is stirred for from { HEAD ~ 6 to 24 hours } at room temperature to complete { TAIL ~ the reaction }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL