The base can be, for example, {TAIL ~ pyridine}, {HEAD ~ dimethylaminopyridine}, quinoline, trialkylamines, and mixtures thereof 
The base can be , for example , { TAIL ~ pyridine } , { HEAD ~ dimethylaminopyridine } , quinoline , trialkylamines , and mixtures thereof
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH