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UV‐Laser Photochemistry: Trapping of the Norrish Type II Triplet Diradical 1‐Hydroxy‐4‐methyl‐1‐phenyl‐1,4‐pentanediyl with Molecular Oxygen
Author(s) -
Adam Waldemar,
Grabowski Sven,
Wilson R. Marshall
Publication year - 1989
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19891220326
Subject(s) - chemistry , diradical , flash photolysis , photochemistry , photodissociation , methanol , trapping , tautomer , triplet state , oxygen , radical , ring (chemistry) , medicinal chemistry , molecule , reaction rate constant , kinetics , organic chemistry , excited state , singlet state , ecology , biology , physics , quantum mechanics , nuclear physics
The triplet lifetime ( 3 ι = 131 ± 5 ns) of diradical 2 , produced in the laser photolysis (334 nm) of 4‐methyl‐1‐phenyl‐1‐pentanone ( 1 ) in methanol, was determined by dioxygen trapping. This lifetime agrees well with the value determined by laser flash photolysis ( 3 ι = 97 ns), thereby establishing the reliability of the trapping technique. The trapping product was prepared by independent synthesis and characterized as 3‐hydroxy‐1,2‐dioxolane 9 , the ring tautomer of hydroperoxide 6 .