Role of hydrogen-bonded nucleophiles in aromatic nucleophilic substitutions in aprotic solvents. reactions of halonitrobenzenes with ethylenediamine, 3-dimethylamino-1-propylamine and histamine in toluene

2005 ◽  
Vol 18 (8) ◽  
pp. 880-885 ◽  
Author(s):  
Cecilia E. Silvana Alvaro ◽  
Norma Sbarbati Nudelman
Keyword(s):  
Aprotic Solvents ◽  
Nucleophilic Substitutions ◽  
Hydrogen Bonded

Effects of the Nucleophile Structure on the Mechanisms of Reaction of 1-Chloro-2,4-dinitrobenzene with Aromatic Amines in Aprotic Solvents

1999 ◽  
Vol 64 (10) ◽  
pp. 1583-1593 ◽  
Author(s):  
Norma Sbarbati Nudelman ◽  
Cecilia E. Silvana Alvaro ◽  
Monica Savini ◽  
Viviana Nicotra ◽  
Jeannette Yankelevich
Keyword(s):  
Hydrogen Bond ◽  
Tertiary Amine ◽  
Aromatic Amines ◽  
Order Rate Constant ◽  
Aprotic Solvents ◽  
Nucleophilic Substitutions ◽  
Hydrogen Bond Acceptor ◽  
Mixed Aggregates ◽  
Kinetics Of

The kinetics of reactions of 1-chloro-2,4-dinitrobenzene with aniline and several substituted aromatic amines, B, in toluene shows a quadratic dependence of the second-order rate constant, kA, on [B], which is preserved even in the presence of increasing amounts of dimethylaniline, while the reaction with N-methylaniline shows a linear dependence of kA vs [B]. All these results are interpreted by the "dimer nucleophile" mechanism, and confirmed by the effects of a non-nucleophilic hydrogen bond acceptor tertiary amine which show the relevance of the structure of the nucleophile and the role of mixed aggregates in defining the mechanisms of aromatic nucleophilic substitutions with amines in aprotic solvents.

scholarly journals The role of acid in the formation of hydrogen-bonded networks featuring 4,4′-dicarboxy-2,2′-bipyridine (H2dcbp): Synthesis, structural and magnetic characterisation of {[Cu(H2dcbp)Cl2]·H2O}2and [Cu(H2dcbp)(NO3)2(H2O)]

CrystEngComm ◽  
2005 ◽  
Vol 7 (13) ◽  
pp. 90-95 ◽  
Author(s):  
Eithne Tynan ◽  
Paul Jensen ◽  
Anthea C. Lees ◽  
Boujemaa Moubaraki ◽  
Keith S. Murray ◽  
...  
Keyword(s):  
Hydrogen Bonded

ChemInform Abstract: Key Role of Water for Nucleophilic Substitutions in Phase Transfer Catalyzed Processes.

ChemInform ◽  
2010 ◽  
Vol 32 (37) ◽  
pp. no-no
Author(s):  
Domenico Albanese ◽  
Dario Landini ◽  
Angelamaria Maia ◽  
Michele Penso
Keyword(s):  
Phase Transfer ◽  
Nucleophilic Substitutions

X-ray and synchrotron diffraction studies of 2-(pyridin-2-yl)-1,10-phenanthroline in the role of ligand for two copper polymorphs or hydrogen bonded with 2,2,6,6-tetramethyl-4-oxopiperidinium hexafluorophosphate

2013 ◽  
Vol 69 (5) ◽  
pp. 498-502 ◽  
Author(s):  
Jeanette A. Krause ◽  
Daoli Zhao ◽  
Sayandev Chatterjee ◽  
Bonnie M. Yeung ◽  
William B. Connick ◽  
...  
Keyword(s):  
Synchrotron Diffraction ◽  
Face To Face ◽  
Monoclinic Form ◽  
Pyramidal Geometry ◽  
Crystallization Conditions ◽  
Acidic Conditions ◽  
Square Pyramidal Geometry ◽  
Triclinic Form ◽  
Hydrogen Bonded

Different extended packing motifs of dichlorido[2-(pyridin-2-yl)-1,10-phenanthroline]copper(II), [CuCl2(C17H11N3)], are obtained, depending on the crystallization conditions. A triclinic form, (I), is obtained from dimethylformamide–diethyl ether or methanol, whereas crystallization from dimethylformamide–water yields a monoclinic form, (II). In each case, the CuIIcentre is in a five-coordinate distorted square-pyramidal geometry. The extended packing for both forms can be described as a highly offset π-stacking arrangement, with interlayer distances of 3.674 (3) and 3.679 (3) Å for forms (I) and (II), respectively. The reaction of diprotonated Pt(tmpip2NCN)Cl [tmpip2NCN = 2,6-bis(2,2,6,6-tetramethylpiperidylmethyl)benzyl] with AgPF6under acidic conditions, followed by the addition of 2-(pyridin-2-yl)-1,10-phenanthroline, results in a hydrogen-bonded cocrystal, 2,2,6,6-tetramethyl-4-oxopiperidinium hexafluorophosphate–2-(pyridin-2-yl)-1,10-phenanthroline (1/1), C9H18NO+·PF6−·C17H11N3, (III). The extended packing maximizes π–π interactions in a parallel face-to-face arrangement, with an interlayer stacking distance of 3.4960 (14) Å.

Dual fluorescence of 4-N,N-dimethylaminopyridine. Role of hydrogen-bonded complex in the ground state

1994 ◽  
Vol 80 (1-3) ◽  
pp. 125-133 ◽  
Author(s):  
C. Cazeau-Dubroca ◽  
G. Nouchi ◽  
M. Ben Brahim ◽  
M. Pesquer ◽  
D. Grose ◽  
...  
Keyword(s):  
Ground State ◽  
Dual Fluorescence ◽  
Hydrogen Bonded

Role of crystallization water molecules on hydrogen-bonded structures and dielectric phase transitions in amino trimethylene phosphonic acid-based crystals

2017 ◽  
Vol 41 (12) ◽  
pp. 5142-5150 ◽  
Author(s):  
Yu-Ling Sun ◽  
Bei-Bei Zheng ◽  
Wen Zhang
Keyword(s):  
Phase Transitions ◽  
Water Molecule ◽  
Phosphonic Acid ◽  
Water Molecules ◽  
Crystallization Water Molecule ◽  
Crystallization Water ◽  
Organic Salts ◽  
Dielectric Phase ◽  
Hydrogen Bonded

Amino trimethylene phosphonic acid-based organic salts show crystallization water molecule-triggered dielectric transitions and relaxations.

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