... 0002-7863/84/1506-5335$01.50/0 0 1984 American Chemical Society ... to gain further insight into the early steps of ACPC ring fragmentation process, we have undertaken stereo- chemical studies ... of (Z)-[4-2Hl]- and (E)-[3,4-2H2]vinylglycine (11 and 12), reported by us previou~ly ...