Ag+ ion complexation properties of N-phenylpolythiazaalkane derivatives: synthesis, crystallography, 1H NMR spectroscopy, potentiometry and metal ion recognition properties

The bimetallic complexes of 1,4-bis-(5-H/methyl/chloro-1H-benzimidazol 2-yl)-1,2,3,4-butanetetraols (L1?L3) with CdCl2 and HgCl2 were synthesized and characterized by elemental analysis, molar conductivity, as well as IR and 1H-NMR spectroscopy. The ligands coordinate to the metal ion through all of the hydroxyl oxygen atoms as tetradentate in the Hg(II) complexes of L1?L3 and in the Cd(II) complexes of L2 and L3. In theCd2(L1)Cl4 complex, the ligand acts as tetradentate through the benzimidazole nitrogen atoms and the two oxygen atoms of the hydroxyl groups near the imidazole ring.

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Study of Molecular Interaction in Binary Mixtures of Poly (Propylene Glycol) Monobutyl Ether(PPGMBE) 1000 with 2-(Methylamino) Ethanol (MAE) and 1-Butanol using Thermodynamic and 1H NMR Spectroscopy

International Conference on Machine Learning, Electrical and Mechanical Engineering (ICMLEME'2014) Jan. 8-9, 2014 Dubai (UAE) ◽

10.15242/iie.e0114073 ◽

2014 ◽

Keyword(s):

Nmr Spectroscopy ◽

Propylene Glycol ◽

Binary Mixtures ◽

1H Nmr ◽

Molecular Interaction ◽

1H Nmr Spectroscopy ◽

Monobutyl Ether ◽

Glycol Monobutyl Ether ◽

Poly Propylene

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Asymetrical Dimer - allyl-palladiu Complexes II. Data from Infrared Spectra and Chemical Behaviour

Revista de Chimie ◽

10.37358/rc.08.7.1888 ◽

2008 ◽

Vol 59 (7) ◽

Author(s):

Maria Maganu ◽

Filip Chiraleu ◽

Constantin Draghici ◽

Gheorghe Mihai

Keyword(s):

Carbon Monoxide ◽

Nmr Spectroscopy ◽

1H Nmr ◽

Infrared Spectra ◽

Analytical Methods ◽

1H Nmr Spectroscopy ◽

Chemical Behaviour ◽

The Asymmetry ◽

Pd Complexes

The previous data obtained by 1H-NMR spectroscopy established the existence of an asymmetry of the bond between Pd and p-allylic groups, even in the p-allyl-Pd complexes dimers which are considered usually symmetric dimers. The asymmetry of the bond depends by the substitutes of the allylic group. Other analytical methods were investigated for additional proof of the obtained results. Thus, this paper discusses how this asymmetry would be reflected in the infrared spectra and in the reaction of the complexes with carbon monoxide.

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Diastereoselective Reduction of Selected α-substituted β-keto Esters and the Assignment of the Relative Configuration by 1H-NMR Spectroscopy

Current Organocatalysis ◽

10.2174/2213337207666201207212540 ◽

2020 ◽

Vol 07 ◽

Author(s):

Christian Trapp ◽

Corinna Schuster ◽

Chris Drewniok ◽

Dieter Greif ◽

Martin Hofrichter

Keyword(s):

Nmr Spectroscopy ◽

1H Nmr ◽

1H Nmr Spectroscopy ◽

Selective Reduction ◽

Reducing Agents ◽

Relative Configuration ◽

Curtius Rearrangement ◽

Keto Esters ◽

Hydroxy Esters ◽

Diastereoselective Reduction

Background:: Chiral β-hydroxy esters and α-substituted β-hydroxy esters represent versatile building blocks for pheromones, β-lactam antibiotics and 1,2- or 1,3-aminoalcohols. Objective:: Synthesis of versatile α-substituted β-keto esters and their diastereoselective reduction to the corresponding syn- or anti-α-substituted β-hydroxy esters. Assignment of the relative configuration by NMR-spectroscopy after a CURTIUS rearrangement of α-substituted β-keto esters to 4-substituted 5-methyloxazolidin-2-ones. Method:: Diastereoselective reduction was achieved by using different LEWIS acids (zinc, titanium and cerium) in combination with complex borohydrides as reducing agents. Assignment of the relative configuration was verified by 1H-NMR spectroscopy after CURTIUS-rearrangement of α-substituted β-hydroxy esters to 4-substituted 5-methyloxazolidin-2-ones. Results:: For the syn-selective reduction, titanium tetrachloride (TiCl4) in combination with a pyridine-borane complex (py BH3) led to diastereoselectivities up to 99% dr. High anti-selective reduction was achieved by using cerium trichloride (CeCl3) and steric hindered reducing agents such as lithium triethylborohydride (LiEt3BH). After CURTIUS-rearrangement of each α-substituted β-hydroxy ester to the corresponding 4-substituted 5-methyloxazolidin-2-one, the relative configuration was confirmed by 1H NMR-spectroscopy. Conclusion:: We have expanded the procedure of LEWIS acid-mediated diastereoselective reduction to bulky α-substituents such as the isopropyl group and the electron withdrawing phenyl ring.

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Conformational study on ribonucleoside O-phosphonylmethyl derivatives by 1H NMR spectroscopy

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19851899 ◽

1985 ◽

Vol 50 (8) ◽

pp. 1899-1905 ◽

Cited By ~ 4

Author(s):

Milena Masojídková ◽

Jaroslav Zajíček ◽

Miloš Buděšínský ◽

Ivan Rosenberg ◽

Antonín Holý

Keyword(s):

Nmr Spectroscopy ◽

1H Nmr ◽

1H Nmr Spectroscopy ◽

Conformational Study ◽

H Nmr ◽

Conformational Properties

Conformational properties of ribonucleoside 5'-O-phosphonylmethyl derivatives have been determined by 1H NMR spectroscopy and compared with those of natural nucleosides and 5'-nucleotides.

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