A process for preparing an azetidinone represented by the formula ##STR16## wherein {HEAD ~ Q} is hydrogen, {TAIL ~ lower alkyl}, phenyl 0 3 or phenyl 0 3  
is
A process for preparing an azetidinone represented by the formula # # STR16 # # wherein { HEAD ~ Q } is hydrogen , { TAIL ~ lower alkyl } , phenyl 0 3 or phenyl 0 3
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH