著者

Chapyshev Sergei Victorovich Tomioka Hideo

出版者

公益社団法人 日本化学会

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.76, no.11, pp.2075-2089, 2003-11-15

参考文献数

47

被引用文献数

49

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Photochemical transformations of quintet dinitrenes have been studied for the first time by FTIR spectroscopy during the photolysis of 1,3-diazidobenzene and its 2-methyl- and 2,4,6-trimethyl-substituted derivatives in solid argon at 13 K. The reactions involve two competitive processes. In the first one, the intramolecular insertion of the nitrene unit into the 1,6-aromatic bond induces ring-opening, which leads to the formation of aminoacetylenes. The second process involves the intramolecular addition of the nitrene unit to the 1,2-aromatic bond followed by ring-opening to form 4(2<I>H</I>-azirin-2-ylidene)-2-butenenitrile derivatives. Methyl groups in <I>ortho</I>-positions to the nitrene units of quintet dinitrenes efficiently protect their aromatic ring from nitrene attacks, substantially increasing the photochemical stability of such species. However, even quintet 2,4,6-trimethylphenylene-1,3-dinitrene decomposes to ring-opened products on extended irradiation. This indicates that quintet dinitrenes are much more photochemically reactive species than triplet nitrenes. Undesirable photochemical rearrangements of the latter at early stages of the photolysis of 1,3-diazidobenzenes are suppressed on introducing the methyl group in position 2 of these azides.