| Abstrakt: |
Azobenzenophanes may be suitable precursor molecules for tetrazetidines with a four-membered nitrogen ring. The synthesis and photochemistry of azobenzenophanes with at least one three-carbon bridge are reported. The photochemistry is dominated by EZ isomerization. This class of azobenzenophanes has thermally stable Z,Z isomers, probably due to the rigidity of the three-carbon bridge. This stiffness, however, hampers tetrazetidine formation. Some clues to tetrazetidine formation are presented and an unusual thermal isomerization E,E → E,Z is reported. |
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