NDLI: Aminolysis of 4-nitrophenyl phenyl carbonate and thionocarbonate: effects of amine nature and modification of electrophilic center from CO to CS on reactivity and mechanism

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Aminolysis of 4-nitrophenyl phenyl carbonate and thionocarbonate: effects of amine nature and modification of electrophilic center from CO to CS on reactivity and mechanism

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Organic & Biomolecular Chemistry Vol - 6 Issue - 8

Organic & Biomolecular Chemistry Vol - 6 Issue - 7

Organic & Biomolecular Chemistry Vol - 6 Issue - 6

Organic & Biomolecular Chemistry Vol - 6 Issue - 5

Organic & Biomolecular Chemistry Vol - 6 Issue - 4

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Organic & Biomolecular Chemistry Vol -5

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Organic & Biomolecular Chemistry Vol -2

Aminolysis of 4-nitrophenyl phenyl carbonate and thionocarbonate: effects of amine nature and modification of electrophilic center from CO to CS on reactivity and mechanism

Content Provider	Royal Society of Chemistry (RSC)
Author	Yoon, Sora Um, Ik-Hwan Park, Hye-Ran Han, Hyun-Joo
Copyright Year	2008
Abstract	A kinetic study is reported for the reactions of 4-nitrophenyl phenyl carbonate (5) and thionocarbonate (6) with a series of alicyclic secondary amines in 80 mol% H2O–20 mol% DMSO at 25.0 ± 0.1 °C. The plots of kobsdvs. amine concentration are linear for the reactions of 5. On the contrary, the plots for the corresponding reactions of 6 curve upward as a function of increasing amine concentration, indicating that the reactions proceed through two intermediates (i.e., a zwitterionic tetrahedral intermediate T± and its deprotonated form T−). The Brønsted-type plot for the reactions of 5 with secondary amines exhibits a downward curvature, i.e., the slope decreases from 0.98 to 0.26 as the pKa of the conjugate acid of amines increases, implying that the reactions proceed through T± with a change in the rate-determining step (RDS). The kN values are larger for the reactions of 5 with secondary amines than for those with primary amines of similar basicity. Dissection of kN values for the reactions of 5 into the microscopic rate constants (i.e., k1 and k2/k−1 ratio) has revealed that k1 is larger for the reactions with secondary amines than for those with isobasic primary amines, while the k2/k−1 ratio is nearly identical. On the other hand, for reactions of 6, secondary amines exhibit larger k1 values but smaller k2/k−1 ratios than primary amines. The current study has shown that the reactivity and reaction mechanism are strongly influenced by the nature of amines (primary vs.secondary amines) and electrophilic centers (CO vs. CS).
Starting Page	1618
Ending Page	1624
Page Count	7
File Format	HTM / HTML PDF
ISSN	14770520
Volume Number	6
Issue Number	9
Journal	Organic & Biomolecular Chemistry
DOI	10.1039/b801422a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Properties of water Tetrahedral carbonyl addition compound Alicyclic compound Phenyl group Radio Data System Dimethyl sulfoxide Acid dissociation constant Reaction mechanism Rate-determining step Curvature Dissection Potassium Electrophile
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Physical and Theoretical Chemistry

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