Ik‐Hwan Um

Ewha Womans University — South Korea

Chemistry · Physical Sciences

37h-index3.9kcitations196works0.02yr avg
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Research Topics

Chemical Reaction Mechanisms(187), Chemical Reactions and Mechanisms(88), DNA and Nucleic Acid Chemistry(66), Organic and Inorganic Chemical Reactions(60), Organic Chemistry Cycloaddition Reactions(43)

Publications196 total

Kinetic study on pyridinolysis of aryl benzenesulfonates: factors governing regioselectivity and reaction mechanism
Canadian Journal of Chemistry·2022Open Access
Effect of medium on reactivity for alkaline hydrolysis of <i>p</i>-nitrophenyl acetate and <i>S</i>-<i>p</i>-nitrophenyl thioacetate in DMSO–H<sub>2</sub>O mixtures of varying compositions: ground state and transition state contributions
Canadian Journal of Chemistry·2021
Hydrazinolysis of aryl cinnamates and related esters: the α-effect arises from stabilization of five-membered cyclic transition state
Canadian Journal of Chemistry·2018· 5 cited
Kinetic study on aminolysis of aryl X-substituted-cinnamates in acetonitrile: differential medium effect determines reactivity and reaction mechanism
Canadian Journal of Chemistry·2018· 2 cited
Unexpected medium effect on the mechanism for aminolysis of aryl phenyl carbonates in acetonitrile and H<sub>2</sub>O: transition-state structure in the catalytic pathway
Canadian Journal of Chemistry·2018· 8 cited
Medium effect on the α-effect for nucleophilic substitution reactions of <i>p</i>-nitrophenyl acetate with benzohydroxamates and <i>m</i>-chlorophenoxide in DMSO–H<sub>2</sub>O mixtures as contrasts with MeCN–H<sub>2</sub>O mixtures: comparing two very different polar aprotic solvent components
Canadian Journal of Chemistry·2018· 3 cited
Medium effect (water versus MeCN) on reactivity and reaction pathways for the S<sub>N</sub>Ar reaction of 1-aryloxy-2,4-dinitrobenzenes with cyclic secondary amines
Canadian Journal of Chemistry·2017· 6 cited
Kinetic Study on Nucleophilic Substitution Reactions of <i>O</i>‐Phenyl <i>O</i>‐Y‐substituted‐Phenyl Thionocarbonates with 1,8‐Diazabicyclo[5.4.0]undec‐7‐ene in Acetonitrile
Bulletin of the Korean Chemical Society·2017· 4 cited
Kinetic Study on Alkaline Hydrolysis of 2‐Pyridyl and 4‐Pyridyl X‐substituted‐Benzoates: Effects of Benzoyl Substituent X and Leaving‐Group Basicity on Reactivity and Reaction Mechanism
Bulletin of the Korean Chemical Society·2017· 7 cited
Kinetic Study on Quinuclidinolysis of <i>O</i>‐Phenyl <i>O</i>‐Y‐substituted‐Phenyl Thionocarbonates: Effects of Changing Nonleaving Group from Thionobenzoyl to Phenyloxythionocarbonyl on Reactivity and Transition‐State Structure
Bulletin of the Korean Chemical Society·2017· 6 cited
Alkaline Hydrolysis of 4‐Nitrophenyl X‐Substituted‐Benzoates Revisited: New Insights from Yukawa–Tsuno Equation
Bulletin of the Korean Chemical Society·2016· 1 cited
Multiparameter kinetic analysis of alkaline hydrolysis of a series of aryl diphenylphosphinothioates: models for P=S neurotoxins
Journal of Physical Organic Chemistry·2016· 8 cited
Kinetic Study on Aminolysis of 4‐Pyridyl Benzoate and <i>O</i>‐4‐Pyridyl Thionobenzoate in Acetonitrile: Factors Influencing Reactivity and Reaction Mechanism
Bulletin of the Korean Chemical Society·2016· 2 cited
Kinetic Study on Aminolysis of <i>O</i>‐2‐Pyridyl Thionobenzoate in Acetonitrile: Effect of Changing Electrophilic Center from CO to CS on Reactivity and Reaction Mechanism
Bulletin of the Korean Chemical Society·2016· 5 cited
Alkali metal ion catalysis and inhibition in alkaline ethanolysis of <i>O</i>-Y-substituted-phenyl <i>O</i>-phenyl thionocarbonates: contrasting M<sup>+</sup> ion effects upon changing electrophilic centre from C=O to C=S
Canadian Journal of Chemistry·2016· 4 citedOpen Access
Kinetic Study on Nucleophilic Substitution Reactions of Aryl Diphenylphosphinates with Butane‐2,3‐dione Monoximate and Aryloxide Anions: Reaction Mechanism and Origin of the α‐Effect
Bulletin of the Korean Chemical Society·2016
Kinetic Study on Nucleophilic Displacement Reactions of Phenyl Y‐Substituted Phenyl Carbonates with 1,8‐Diazabicyclo[5.4.0]undec‐7‐ene: Effects of Amine Nature on Reaction Mechanism
Bulletin of the Korean Chemical Society·2015· 6 cited
Kinetic Study on <scp>S<sub>N</sub>Ar</scp> Reactions of 1‐(Y‐Substituted‐phenoxy)‐2,4‐dinitrobenzenes with Azide Ion: Effect of Changing Nucleophile from Hydroxide to Azide Ion on Reaction Mechanism and Reactivity
Bulletin of the Korean Chemical Society·2015· 1 cited
<scp>S<sub>N</sub>Ar</scp> Reactions of 1‐Halo‐2,4‐dinitrobenzenes with Alkali‐Metal Ethoxides: Differential Stabilization of Ground State and Transition State Determines Alkali‐Metal Ion Catalysis or Inhibition
Bulletin of the Korean Chemical Society·2015· 2 cited
Kinetic Study on Quinuclidinolysis of <i>O</i>‐4‐Nitrophenyl X‐substituted Thionobenzoates and <i>O</i>‐3,4‐Dinitrophenyl Thionobenzoate: Effect of Amine Nature on Reactivity and Reaction Mechanism
Bulletin of the Korean Chemical Society·2015· 3 cited
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Frequent Co-authors

Erwin Buncel(16), Young-Hee Shin(7), Jiyoun Lee(6), Mizue Fujio(5), Yuho Tsuno(5), Sun‐Kun Bae(5), Hye-Ran Park(4), Jeong‐Yoon Han(4), Sangeun Jeon(4), Hyun-Joo Han(3), Jin‐Ah Seok(3), So-Jeong Hwang(3), Julian M. Dust(3), Jin-Young Hong(3), Mi-Hwa Baek(3), Li-Ra Im(3), Ji‐Sun Kang(3), Kyung‐Hee Kim(2), Jung‐Ae Ahn(2), Masaaki Mishima(2)