81759-40-2Relevant academic research and scientific papers
Scavenging of 1,4-Biradicals by Bis(acetylacetonato)copper(II). The Importance of Paramagnetic Effects
Scaiano, J. C.,Lee, Carolyn W. B.,Chow, Yuan L.,Marciniak, Bronislaw
, p. 2452 - 2455 (1982)
Cu(acac)2 is shown to interact with the triplet biradical (CH3)2C.CH2CH2C.(OH)C6H5 promoting its intersystem crossing to the product forming singlet species.The scavenging of the biradicals does not lead to any new products, but the product ratios (cyclobutanol and acetophenone) are modified, showing that paramagnetic scavengers can exert some control on the conformation of the nascent singlet biradical.The rate of scavenging in methanol at 27 deg C is 2.0E9 M-1 s-1, as determined by laser flash photolysis.
UV-Laser Photochemistry: Trapping of the Norrish Type II Triplet Diradical 1-Hydroxy-4-methyl-1-phenyl-1,4-pentanediyl with Molecular Oxygen
Adam, Waldemar,Grabowski, Sven,Wilson, R. Marshall
, p. 561 - 564 (2007/10/02)
The triplet lifetime (3τ = 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 (3τ = 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. - Keywords: Norrish type II triplet diradical/ UV-Laser photochemistry
Photochemistry of Phenyl Alkyl Ketones in the Presence of Triphenylphosphine
Chow, Yuan L.,Marciniak, Bronislaw
, p. 2910 - 2914 (2007/10/02)
Photolysis of butyrophenone, valerophenone, γ-methylvalerophenone, and acetophenone in methanol in the presence of triphenylphosphine gave triphenylphosphine oxide and 1-phenyl-1-methoxyalkanes in addition to the expected Norrish type II products.Kinetic studies of these photoreactions by steady-state measurements show that triplet-state ketones are quenched by Ph3P but that the corresponding biradicals do not interact with Ph3P.
