The presence of {TAIL ~ the catalyst} in a mixture of the substance to be succinylated and succinic anhydride results in {HEAD ~ significantly greater yield} of the desired succinylated product  
The presence of { TAIL ~ the catalyst } in a mixture of the substance to be succinylated and succinic anhydride results in { HEAD ~ significantly greater yield } of the desired succinylated product
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH