It is {HEAD ~ an object} of {TAIL ~ the present invention} to provide a high conversion of isobutylene contained in a mixture of isomeric butenes simultaneously with a reduced yield of by products sec.butylphenols 
of
It is { HEAD ~ an object } of { TAIL ~ the present invention } to provide a high conversion of isobutylene contained in a mixture of isomeric butenes simultaneously with a reduced yield of by products sec.butylphenols
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH