Azete, Azetine and Azetidine

azetine and azetidine are the aza analogues of cyclobutadiene, cyclobutene and cyclobutane, respectively (Box 8.1). 

As the gases emerge from the heated area of the reactor, 2-phenyl-benzo[ ]azete can be trapped out on a cold finger maintained at -78 C. However, if the temperature is allowed to rise to about -40 C, the compound forms a dimer. 

The loss of nitrogen from an azide to form a nitrene can b /isuatlzed as shown, atthougi. vhether the fragmentation involves two electrons (doubte-headedi arrows) or a single electron (fish-hooks) is not important to this discussion  

Nnronos rea -1 r adiK/ with electron ficli Systems m order to acquire an outer electron shell orn N containing eiglit etactTons. 

Because of their immense importance to mankind, the discovery and the mode of action of the (3-lactams has been surveyed in detail, and similarly there are numerous methods for their synthesis.  

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