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Photoelectron spectra of 1,2-dialkyl-1,2-diazetidines show that the 1,2-dimethyl compound (1) exists overwhelmingly in the "diequatorial" trans conformation, while a significant amount of the "diaxial" trans conformation is detected for the diisopropyl compound (2), and the tricyclic structure holds the diazetidine ring in nearly eclipsed geometry for 3,4-dimethyl-3,4-diazatricyclo[4.2.1,02•5]non-7-ene (4) and its saturated analogue (3). Although A-dimethylaminoazetidine (5), TV-dipropylaminoazetidine (6), and biazetidine (8) are predominantly in gauche conformations, the anti conformation predominates for A-piperidinylazetidine (7). The rates of double nitrogen inversion for 3 and 4 are nearly identical and increase slightly with increasing solvent polarity, and SG*29S is about 3.8 kcal/mol lower than for 1. The ESR splitting constants for the cations from 1, 2, and 8 are reported, and compared to those for other tetraalkylhydrazine radical cations.

Mit Hilfe der PE‐Spektren werden die vertikalen Ionisationspotentiale der Tetrazene (I) in Acetonitril und CH2Cl2 bestimmt.

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