We have previously reported that p-azido-a-chloroy-methoxy-A aT lF-crotonolactone (la) undergoes thermolysis in refluxing benzene to give chlorocyanoketene (2%) and methylformate. 1Reported here is the observation that the corresponding a-bromo-and a-iodo-analogs ofA under-
Die thermo‐ und photolytische Ringverengung der Azido‐pyrrolinone (Ib), (IC) und (IV) [Photolyse im Falle (IVd), Ausb. 72% (VId)] zu den Azetidinonen (IIa) bzw. (IIb) + (III) bzw. (VI) wird untersucht [(Ia) reagiert nicht analog, sondern bildet den Amido‐Ester (VII)].
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