scholarly journals Effect of Conformation on Ring Opening of Cis and Trans Dimers of Acenaphthylene in the Triplet State. Direct Detection of Hydrocarbon Biradical, 1,1′-Biacenaphthene-2,2′-diyl

1982 ◽  
Vol 55 (9) ◽  
pp. 3013-3018 ◽  
Author(s):  
Harumichi Kobashi ◽  
Hiroki Ikawa ◽  
Reiko Kondo ◽  
Toshifumi Morita
Keyword(s):  
Triplet State ◽  
Ring Opening ◽  
Direct Detection ◽  
Cis And Trans

The Photochemistry of a Dihydropyridazine

1973 ◽  
Vol 51 (11) ◽  
pp. 1729-1736 ◽  
Author(s):  
P. De Mayo ◽  
M. C. Usselman
Keyword(s):  
Triplet State ◽  
Ring Opening ◽  
Quantum Yields ◽  
Trans Isomers ◽  
Absorption Bands ◽  
Cis And Trans

Irradiation of a 5,6-dihydropyridazine in either the n → π* or π → π* absorption bands results in ring-opening to the two isomeric diazatrienes expected of a concerted, electrocyclic process. Population of the triplet state of the dihydropyridazine by sensitization also results in ring-opening, but much less efficiently. The quantum yields of the two processes were found to be 0.40 ± 0.04 and 0.07 ± 0.01, respectively. The primary photoproducts, cis,cis- and cis,trans-4,5-diazatriene, isomerize thermally at temperatures greater than 20° to the trans,cis and trans,trans isomers.

Direction of ring-opening of cis- and trans-2-methylcyclopropylcarbinyl radicals

1976 ◽  
pp. 814 ◽  
Author(s):  
Peter Blum ◽  
Alwyn G. Davies ◽  
Michel Pereyre ◽  
Max Ratier
Keyword(s):  
Ring Opening ◽  
Cis And Trans
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