Further, it is preferred that the crystallization from {HEAD ~ the crude polar vinyl compound} be performed in {TAIL ~ the presence} of an alcohol or a basic compound 
Further , it is preferred that the crystallization from { HEAD ~ the crude polar vinyl compound } be performed in { TAIL ~ the presence } of an alcohol or a basic compound
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH