Photoreduction on Irradiation of 3, 3, 5, 5??Tetramethyl??4??methylene??1??pyrazoline.—An Overlooked Example of a Reaction Competing with the Extrusion of Molecular …

H Quast, H Jakobi

Index: Quast, Helmut; Jakobi, Harald Chemische Berichte, 1991 , vol. 124, # 7 p. 1613 - 1618

Full Text: HTML

Citation Number: 8

Abstract

The photolysis of the 4-methylene-1-pyrazoline 1 is reinvestigated under a variety of experimental conditions. Direct irradiation (350-nm light) affords the alkylidenecyclopropanes 4 and 5 as predominant products, besides molecular nitrogen, and in a constant ratio of (55* 1):(45 T l), which is not altered in the presence of 1, 4-diazabicyclo [2.2. 2] octane (DABCO) or piperylene nor in [D,] acetone solution. When oxygen is ...