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Laser-flash photolysis of naphthyl diselenides; reactivities of naphthylseleno radicals

✍ Scribed by Maksudul M. Alam; Osamu Ito; Yoshinori Koga; Akihiko Ouchi

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 212 KB
Volume: 30
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(1998)30:3<193::aid-kin4>3.0.co;2-n

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✦ Synopsis

Transient absorption spectra of 1-naphthylseleno and 2-naphthyl-и (1-NaphSe ), seleno radicals, which are generated by laser-flash photolysis of the correspond-и (2-NaphSe ) ing diselenides, were observed. The reactions of and with 2-methyl-и и

1-NaphSe , 2-NaphSe 1,3-butadiene and ␣-methylstyrene were investigated by following the decay rates of these seleno radicals. By both steady-state and laser-flash photolysis, it is proved that these seleno radicals add to alkenes in a reversible manner. The reaction rate constants for such reversible addition reactions were determined by conducting the reaction in the presence of O 2 , which traps selectively the carbon-centered radicals formed by the addition reaction of the seleno radicals to the alkenes. The reactivity of is higher than that of both of и и 2-NaphSe 1-NaphSe , which are less reactive than These reactivities were interpreted with the properties of и PhSe . SOMO calculated by MO method.

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