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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

✍ Scribed by Adam, Waldemar ;Grabowski, Sven ;Wilson, R. Marshall

Publisher
Wiley (John Wiley & Sons)
Year
1989
Tongue
English
Weight
374 KB
Volume
122
Category
Article
ISSN
0009-2940

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✦ Synopsis

The triplet lifetime (% = 131 f 5 ns) of diradical 2, produced in the laser photolysis (334 nm) of 4-methyl-1-phenyl-1-penfanone

(1) in methanol, was determined by dioxygen trapping. This lifetime agrees well with the value determined by laser flash photolysis (% = 97 ns), thereby establishing the reliability of the trapping technique. The trapping product was prepared by independent synthesis and chracterized as 3-hydroxy-I ,2-dioxolane 9, the ring tautomer of hydroperoxide 6.

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Thc UV-VIS laser irradiatiun o f 4-puntcn-4-olidc ( I ) with hcii-Lophenone (BPI o r with p-bcnzoquinone (BQ) undcr an argon xtniosphcrc dTorded the acctal-type oxctanes 2-BP arid 2-BQ. rcspcctivrly. Only for BP was the oxctanc regioisorncr 3-BP oht;iinrd. x t u a l l y iis rn;ijnr product. while 34