Intramolecular hydrogen-bonding from heme carboxylic acid side chains to axial ligands

1993 ◽  
Vol 32 (22) ◽  
pp. 4979-4981 ◽  
Author(s):  
Kyoungja Woo ◽  
D. A. Sweigart
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Intramolecular Hydrogen Bonding ◽  
Side Chains ◽  
Axial Ligands ◽  
Intramolecular Hydrogen

Photochemical reactions of azo compounds. X. Photochemical properties of azobenzene-2-carboxylic acids

1967 ◽  
Vol 20 (5) ◽  
pp. 929 ◽  
Author(s):  
CP Joshua ◽  
GE Lewis
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Intramolecular Hydrogen Bonding ◽  
Photochemical Reactions ◽  
Azo Compounds ◽  
Neutral Compounds ◽  
Methyl Derivatives ◽  
Intramolecular Hydrogen ◽  
Derivatives Of

Two chloro and two methyl derivatives of azobenzene-2-carboxylic acid have been found to yield the corresponding derivatives of benzo[c]cinnoline-4- carboxylic acid in good yields when irradiated in 98% sulphuric acid. The question of intramolecular hydrogen bonding in relation to the properties of azobenzene-2-carboxylic acids is discussed. Infrared absorption spectra of the neutral compounds have provided confirmation of internal hydrogen bonding. Attempts to prepare the cis isomers of these azo compounds have been unsuccessful.

Einfluß der Enolisierung auf die Reduktion von β Ketocarbonsäure-Derivaten mit Zinkborhydrid / Influence of the Enol Formation on the Reduction of β-Keto Carboxylic Acid Derivatives by Zinc Borohydride

1991 ◽  
Vol 46 (12) ◽  
pp. 1713-1719 ◽  
Author(s):  
Herbert Meier ◽  
Volker Krause
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Structure Determination ◽  
Intramolecular Hydrogen Bonding ◽  
Steric Effects ◽  
Group A ◽  
Hydroxy Compounds ◽  
Intramolecular Hydrogen ◽  
Enol Formation

Depending on the keto-enol equilibrium 1 ⇄ 2 reduction of the esters and the amides 1/2 a—g with Zn(BH4)2/ZnCl2 attacks either at the CO or at the CO2R group. A high diastereoselectivity (98:2 or more) is observed for the formation of the β-hydroxy compounds 3a,b,c,e,f in favour of the erythro forms. As to the structure determination of 3, different steric effects and different intramolecular hydrogen bonding have to be considered, leading to different rotameric populations.

Synthesis and P.M.R. study of 2-(2',4'-Dihydroxy-6'-methylbenzoyl)-3,6-dihydroxybenzoic acid and its methyl ethers

1975 ◽  
Vol 28 (3) ◽  
pp. 657 ◽  
Author(s):  
BW Au-Yeung ◽  
T Chan ◽  
SW Tam
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Potassium Hydroxide ◽  
Chemical Shifts ◽  
Intramolecular Hydrogen Bonding ◽  
Dihydroxybenzoic Acid ◽  
Alcoholic Potassium Hydroxide ◽  
Intramolecular Hydrogen ◽  
Aryl Methyl ◽  
Methoxybenzoic Acid

The syntheses of 2-(2?,4?-dihydroxy-6?-methylbenzoyl)-3,6- dihydroxybenzoic acid (4) and its methyl ethers are described. Treatment of 6-hydroxy-2-(2?-hydroxy-4?-methoxy-6?-methylbenzoyl)-3- methoxybenzoic acid (8) with alcoholic potassium hydroxide gave 2- hydroxy-6-methoxy-8-methyl-9-oxoxanthene-1-carboxylic acid (9). Comparison of the p.m.r. spectra of these structurally related 2- benzoylbenzoic acids revealed that the chemical shifts of the aryl methyl and the ring protons are significantly influenced by the existence of intramolecular hydrogen bonding.

scholarly journals A trigonal coordination of Au(I) phosphane complexes stabilized by O–H⋯X (X = Cl–, Br–, I–) interactions

2021 ◽  
Author(s):  
Petra Gründlinger ◽  
Cezarina Cela Mardare ◽  
Thorsten Wagner ◽  
Uwe Monkowius
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Hydrogen Bonds ◽  
Intramolecular Hydrogen Bonding ◽  
Molecular Structures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Standard Linear ◽  
Intramolecular Hydrogen ◽  
Linear Coordination

AbstractIn this work, we show that intramolecular hydrogen bonding can be used to stabilize tri-coordinated phosphane-gold(I) complexes. Two molecular structures of 2-(diphenylphosphino)benzoic acid (L) coordinated to a gold(I) atom were determined by single-crystal X-ray diffraction. The linear L–Au–Br shows a standard linear coordination and dimerizes via hydrogen bonds of the carboxylic acid. Upon addition of two additional phosphane ligands the complex [L3Au]X is formed which is stabilized by three intramolecular –C(O)O–H…X hydrogen bonds as proven by the X-ray structure of the respective chlorido-complex. X-ray powder diffractograms suggest the same structure also for X– = Br– and I–. Graphic abstract

Synthesis, characterization and antibacterial activities of N-tert-butoxycarbonyl-thiazolidine carboxylic acid

RSC Advances ◽  
2015 ◽  
Vol 5 (32) ◽  
pp. 24824-24833 ◽  
Author(s):  
Zhong-Cheng Song ◽  
Gao-Yuan Ma ◽  
Hai-Liang Zhu
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Nucleophilic Substitution ◽  
Kinetic Resolution ◽  
Intramolecular Hydrogen Bonding ◽  
Antibacterial Activities ◽  
Dynamic Kinetic Resolution ◽  
Qualitative Explanation ◽  
Intramolecular Hydrogen

The mechanism of dynamic kinetic resolution, a nucleophilic substitution through an intramolecular hydrogen bonding by the formation of N-Boc-TCAs was proposed and a qualitative explanation was interpretated according to Curtin–Hammett principle.

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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