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Review | Special issue | Vol 30, No. 2, 1990, pp.1307-1318
Published online, 1st January, 1970
DOI: 10.3987/REV-89-SR10
The Thermal and Photochemical Behaviors of the Cyclomers of Ethylenebis- and Trimethylenebis(pyridinyl) Diradicals

Takashi Muramatsu, Yusaku Ikegami,* and Kaoru Hanaya

*Chemical Research Institute of Non-Aqueous Solutions, Tohoku University,. Katahira, Aoba-ku, Sendai 980-8577, Japan


Pyridinyl diradicals of the type Py-(CH2)n-Py (Py = pyridinyl, n=2,3), which possess two pyridinyl monoradicals connected through a methylene chain, exist usually in equilibrium with the meso and dl cyclomers formed by intramolecular cyclization of the diradical. The equilibrium between diradical and cyclomers tends overwhelmingly toward the cyclomers in the dark and the cyclomers photodissociate to generate the diradical. This paper concentrates ou recent results on the preparation, structure, and thermal and photochemical behaviors of the diradicals and the cyclomers.