Bong Ser Park
Dongguk University
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Publication
Featured researches published by Bong Ser Park.
Organic Letters | 2011
Peter Šebej; Bum Hee Lim; Bong Ser Park; Richard S. Givens; Petr Klán
A clean bifurcation between two important photochemical reactions through competition of a triplet state Type II H-abstraction reaction with a photo-Favorskii rearrangement for (o/p)-hydroxy-o-methylphenacyl esters that depends on the water content of the solvent has been established. The switch from the anhydrous Type II pathway that yields indanones to the aqueous-dependent pathway producing benzofuranones occurs abruptly at low water concentrations (~8%). The surprisingly clean yields suggest that such reactions are synthetically promising.
Tetrahedron Letters | 2002
Dong Jo Chang; Keepyung Nahm; Bong Ser Park
Abstract 1-Benzoy1-1-( o -ethylphenyl)cyclopropane favors the E -indanol formation in its photochemical reaction and the selectivity is maximized in methanol. These are exactly opposite to the photochemical behavior of α-( ortho -ethylphenyl)acetophenone. Our computational studies suggest that the different stereochemical outcome of the two systems originates from the geometric difference of initially formed biradical intermediates.
Tetrahedron Letters | 1996
Bokyung Jung; Hongbum Kim; Bong Ser Park
Abstract The title compounds were prepared by the Erlenmeyer synthesis and irradiated with or without a Pyrex filter using 450 W medium pressure mercury arc lamp. Cis-trans isomerization was the major reaction under pyrex filtered condition, whereas irradiation without a Pyrex filter resulted in decarbonylation, followed by trapping of the ketenimine intermediate by protic solvents.
Photochemical and Photobiological Sciences | 2012
Bokolombe Pitchou Ngoy; Peter Šebej; Tomáš Šolomek; Bum Hee Lim; Tomáš Pastierik; Bong Ser Park; Richard S. Givens; Dominik Heger; Petr Klán
A 2-hydroxyphenacyl moiety absorbing below 370 nm is proposed as a new photoremovable protecting group for carboxylates and sulfonates. Laser flash photolysis and steady-state sensitization studies show that the leaving group is released from a short-lived triplet state. In addition, DFT-based quantum chemical calculations were performed to determine the key reaction steps. We found that triplet excited state intramolecular proton transfer represents a major deactivation channel. Minor productive pathways involving the triplet anion and quinoid triplet enol intermediates have also been identified.
Tetrahedron Letters | 1999
Dong Jo Chang; Eunsook Koh; Tae Young Kim; Bong Ser Park; Taeg Gyum Kim; Hahkjoon Kim; Du-Jeon Jang
Abstract Photolysis of the title compounds results in efficient hydrogen transfer reaction to produce 1,5-biradical intermediate, which does not form in the photolysis of a structurally similar compound, α-(o-tolyl)isobutyrophenone. From their kinetic studies we have measured the rearrangement rate constant of a substituted oxiranylcarbinyl radical.
Journal of Physical Chemistry A | 2001
Hahkjoon Kim; Taeg Gyum Kim; Joeoong Hahn; Du-Jeon Jang; Dong Jo Chang; Bong Ser Park
Tetrahedron Letters | 2001
Dong Jo Chang; Bong Ser Park
Tetrahedron Letters | 2010
Bong Ser Park; Hyuk Jun Ryu
Bulletin of The Korean Chemical Society | 2008
Bong Ser Park; Hye Mi Lee
Bulletin of The Korean Chemical Society | 2004
Sungsu Cho; Bong Ser Park