Synthesis and characterization of polyamides containing imidazole: intramolecular hydrogen bonding and constitutional isomerism

1993 ◽  
Vol 26 (8) ◽  
pp. 2077-2084 ◽  
Author(s):  
Kevin J. Bouck ◽  
Paul G. Rasmussen
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Synthesis And Characterization ◽  
Intramolecular Hydrogen

Synthesis and characterization of N-Chloro-o-nitroanilines

1976 ◽  
Vol 29 (2) ◽  
pp. 367 ◽  
Author(s):  
KJ Chapman ◽  
LK Dyall
Keyword(s):  
Hydrogen Bonding ◽  
Carbon Tetrachloride ◽  
Infrared Spectra ◽  
Acid Catalysis ◽  
Intramolecular Hydrogen Bonding ◽  
Synthesis And Characterization ◽  
Catalysed Reaction ◽  
Lone Pairs ◽  
Intramolecular Hydrogen

Chlorine(1) oxide in carbon tetrachloride was found to be an effective reagent for N-chlorinating 2-nitroanilines. These N-chloro-2-nitroanilines are sufficiently stable in solution at 20� to be characterized by reduction and by proton n.m.r, and infrared spectra. The infrared N-H stretching frequencies fall near the low value of 3330 cm-1, apparently because of interaction between N-H bond and chlorine lone pairs; there are also effects of intramolecular hydrogen bonding and of conformation. Under acid catalysis, N-chloro-2-nitroaniline rearranges to C-chlorinated 2-nitroanilines, while with alkali it cyclizes to benzofuroxan. The acid-catalysed reaction has the same features as the Orton rearrangement of N-chloroacetanilides.

New Stable Neutral Radical with Intramolecular Hydrogen Bonding:  Synthesis and Characterization of 2,5,8-Tri-tert-butyl-7-hydroxy-6-oxophenalenoxyl

2001 ◽  
Vol 3 (20) ◽  
pp. 3099-3102 ◽  
Author(s):  
Yasushi Morita ◽  
Suguru Maki ◽  
Kozo Fukui ◽  
Tomohiro Ohba ◽  
Junya Kawai ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Synthesis And Characterization ◽  
Neutral Radical ◽  
Tert Butyl ◽  
Intramolecular Hydrogen

scholarly journals Crystallographic and spectroscopic characterization of 3-chloro-5-fluorosalicylaldehyde

2020 ◽  
Vol 76 (12) ◽  
pp. 1810-1812
Author(s):  
Christopher T. Triggs ◽  
Joseph M. Tanski
Keyword(s):  
Hydrogen Bonding ◽  
Title Compound ◽  
Intramolecular Hydrogen Bonding ◽  
Spectroscopic Characterization ◽  
Face To Face ◽  
Π Stacking ◽  
Intramolecular Hydrogen

The title compound (systematic name: 3-chloro-5-fluoro-2-hydroxybenzaldehyde), C7H4ClFO2, is a dihalogenated salicylaldehyde derivative that has been studied for its antibacterial characteristics. The salicylaldehyde engages in intramolecular hydrogen bonding with an O—H...O distance of 2.6231 (19) Å while the molecules pack together via weak intermolecular C—H...O, C—H...F and F...O interactions and offset face-to-face π-stacking.

Heteroleptic palladium(II) complexes of dipyrrin-1,9-dione supported by intramolecular hydrogen bonding

2020 ◽  
Vol 24 (01n03) ◽  
pp. 112-120 ◽  
Author(s):  
Clayton J. Curtis ◽  
Elisa Tomat
Keyword(s):  
Hydrogen Bonding ◽  
Chemical Characterization ◽  
Intramolecular Hydrogen Bonding ◽  
Palladium Complexes ◽  
Primary Amines ◽  
Redox Active ◽  
Electron Reduction ◽  
Intramolecular Hydrogen ◽  
Planar Geometries

The dipyrrin-1,9-dione framework, which is characteristic of the propentdyopent pigments deriving from heme metabolism, coordinates metal ions as monoanionic bidentate donors. The resulting analogs of dipyrrinato complexes undergo reversible ligand-based reductions, thus showcasing the ability of the dipyrrindione scaffold to act as an electron reservoir. Herein we report the synthesis and characterization of three heteroleptic palladium complexes of the redox-active dipyrrindione ligand. Primary amines were chosen as additional ligands so as to assemble complexes of planar geometries with complementary interligand hydrogen-bonding. Full chemical characterization confirms the hydrogen bonding interactions between the primary amine ligands and the acceptor carbonyl groups on the dipyrrolic ligand. The resulting heteroleptic compounds display reversible one-electron reduction events that are centered on the dipyrrindione ligand as revealed by voltammetry and spectroelectrochemistry data. Within these planar Pd(II) complexes, the propentdyopent motif therefore combines reversible ligand-based redox chemistry with interligand hydrogen bonding in the primary coordination sphere of the metal center.

Theoretical study of intramolecular hydrogen bonding and molecular geometry of 2-trifluoromethylphenol

10.1002/jcc.2 ◽  
1996 ◽  
Vol 17 (16) ◽  
pp. 1804-1819 ◽  
Author(s):  
Attila Kov�cs ◽  
Istv�n Kolossv�ry ◽  
G�bor I. Csonka ◽  
Istv�n Hargittai
Keyword(s):  
Hydrogen Bonding ◽  
Theoretical Study ◽  
Molecular Geometry ◽  
Intramolecular Hydrogen Bonding ◽  
Intramolecular Hydrogen
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