Abe M, Kawanami S, Masuyama A, Hayashi T. A Matrix Isolation Study of 2-Isopropylidenecyclopentane-1,3-diyl (Berson-Type Diradical).
J Org Chem 2006;
71:6607-10. [PMID:
16901152 DOI:
10.1021/jo060587l]
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Abstract
The photodenitrogenation of diazene 5 in an argon matrix at 10 K permitted the first observation of an IR spectrum of 2-isopropylidenecyclopentane-1,3-diyl 2 (a Berson-type diradical). A comparison of the IR spectrum with a vibrational simulation at the B3LYP/6-31G(d) level of theory revealed that the diradical 2 has a planar structure. The oxygen-trapping reaction of 2 produced regioselectively fused peroxide 6 in an oxygen-doped argon matrix at 10 K. Irradiation of the diradical 2 afforded enyne 8 in an argon matrix at 10 K.
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