scholarly journals 4,4′-Di-tert-butyl-2,2′-bipyridinium Trifluoromethanesulfonate

Molbank ◽  
10.3390/m1261 ◽  
2021 ◽  
Vol 2021 (3) ◽  
pp. M1261
Author(s):  
Shintaro Kodama ◽  
Kazuki Bunno ◽  
Akihiro Nomoto ◽  
Akiya Ogawa
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
Diethyl Ether ◽  
Elemental Analysis ◽  
1H Nmr Spectroscopy ◽  
Trifluoromethanesulfonic Acid ◽  
Simple Method ◽  
Tert Butyl ◽  
Ft Ir ◽  
Direct Use

4,4′-di-tert-butyl-2,2′-bipyridinium trifluoromethanesulfonate was synthesized by stirring 4,4′-di-tert-butyl-2,2′-bipyridine with scandium(III) trifluoromethanesulfonate in acetonitrile, followed by precipitation with diethyl ether. The structure of the new compound was characterized by FT-IR, 1H, 13C{1H} and 19F{1H} NMR spectroscopy and CHN elemental analysis. This is a safe and simple method to obtain mono-protonated bipyridinium trifluoromethanesulfonate without the direct use of trifluoromethanesulfonic acid.

Use of high-resolution proton nuclear magnetic resonance spectroscopy for rapid multi-component analysis of urine.

1984 ◽  
Vol 30 (3) ◽  
pp. 426-432 ◽  
Author(s):  
J R Bales ◽  
D P Higham ◽  
I Howe ◽  
J K Nicholson ◽  
P J Sadler
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
High Resolution ◽  
1H Nmr ◽  
1H Nmr Spectroscopy ◽  
Proton Nuclear Magnetic Resonance ◽  
Resonance Spectroscopy ◽  
Simple Method ◽  
Nuclear Magnetic

Abstract Numerous low-Mr metabolites--including creatinine, citrate, hippurate, glucose, ketone bodies, and various amino acids--have been identified in 400- and 500-MHz proton nuclear magnetic resonance (1H NMR) spectra of intact human urine. The presence of many of these was related to the specific condition of the donors: humans in different physiological states (resting, fasting, or post-exercise) and pathological conditions (e.g., diabetes mellitus, cadmium-induced renal dysfunction). We have also monitored the metabolism of simple nonendogenous compounds (methanol and ethanol) and of acetaminophen. The pH-dependencies of the NMR chemical shifts of some urine components are reported. Our studies show that high-resolution 1H NMR spectroscopy provides a fast, simple method for "fingerprint" identification of urinary compounds. In some cases, analytes can be quantified by standard additions or by comparing integrated peak areas for the metabolites with those for creatinine. Determinations of creatinine by 1H NMR spectroscopy compared well with those by an independent chemical assay based on the Jaffé reaction.

SYNTHESIS AND PROPERTIES OF INTERACTION PRODUCTS OF TRIS[TRI(BUTOXY)TITANATE]BORON AND ALIPHATIC FLUORINATED ALCOHOLS

2018 ◽  
Vol 59 (1) ◽  
pp. 75 ◽  
Author(s):  
N.Ya. Kuzmenko ◽  
S.N. Kuzmenko ◽  
O.V. Skrinnik ◽  
V.V. Bugrym
Keyword(s):  
Nmr Spectroscopy ◽  
Molecular Mass ◽  
1H Nmr ◽  
Elemental Analysis ◽  
1H Nmr Spectroscopy ◽  
Alkoxy Group ◽  
Partial Substitution ◽  
Fluorinated Alcohols ◽  
Analysis Determination

Synthesis and properties of products based on tris[[tri(butoxy)titanate]boron with complete or partial substitution of butoxy groups linked with titanium by fluorinated alkoxy group were described. Extracted products were liquid or solid substances which are high soluble in aliphatic-, aromatic- chloraromatic- and chlorinated hydrocarbons, low alcohols, and ketone. Their structure was confirmed by elemental analysis, determination of molecular mass, IR and 1H NMR spectroscopy.

scholarly journals The First Application of 1H NMR Spectroscopy for the Assessment of the Authenticity of Perfumes

2019 ◽  
Author(s):  
Grzegorz Ciepielowski ◽  
Barbara Pacholczyk-Sienicka ◽  
Łukasz Albrecht
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
1H Nmr Spectroscopy ◽  
Negative Impact ◽  
Poor Quality ◽  
Proton Nuclear Magnetic Resonance ◽  
Resonance Spectroscopy ◽  
Simple Method ◽  
Counterfeit Goods ◽  
Safety Issues

The industry of the counterfeit goods is one of the largest underground business in the world and it is rapidly growing. Counterfeits can lead not only to loss of profit for honest producers but also have a negative impact on consumers who receive poor quality goods at an excessive price and may be exposed to health damages and safety issues. Perfume industry is constantly exposed to the problem of counterfeits with the fast developing parallel market of inspired perfumes being an important issue. It prompts for the identification of methods that classify the quality of this type of products. In this paper the application of proton nuclear magnetic resonance spectroscopy is employed for the authentication of perfumery products for the first time. Molecular composition of several types of authentic brand fragrances for women were compared with their cheaper inspired equivalents and fake products. Our approach offers the prospect of a fast and simple method for discrimination and counterfeit detection of perfumes using 1H NMR spectroscopy.

scholarly journals Comparison between the humic acids characteristics of two andisols of different age by: FT-IR and 1H-NMR spectroscopy and py-FIMS

2012 ◽  
Vol 50 (2) ◽  
pp. 148-158 ◽  
Author(s):  
A. Baglieri ◽  
M. Gennari ◽  
A. Ioppolo ◽  
P. Leinweber ◽  
M. Nègre
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
Humic Acids ◽  
1H Nmr Spectroscopy ◽  
Ft Ir

scholarly journals Quantitative Determination and Validation of Four Ketones in Salvia miltiorrhiza Bunge Using Quantitative Proton Nuclear Magnetic Resonance Spectroscopy

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2043
Author(s):  
Yuanyuan Li ◽  
Zhuoni Hou ◽  
Feng Su ◽  
Jipeng Chen ◽  
Xiaodan Zhang ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
1H Nmr Spectroscopy ◽  
Salvia Miltiorrhiza ◽  
Tanshinone Iia ◽  
Proton Nuclear Magnetic Resonance ◽  
Resonance Spectroscopy ◽  
Salvia Miltiorrhiza Bunge ◽  
Simple Method ◽  
Tanshinone I

Salvia mltiorrhiza Bunge (SMB) is native to China, whose dried root has been used as medicine. A few chromatographic- or spectrometric-based methods have already been used to analyze the lipid-soluble components in SMB. However, the methodology of qNMR on the extracts of fresh SMB root has not been verified so far. The purpose of this study was to establish a fast and simple method to quantify the tanshinone I, tanshinone IIA, dihydrotanshinone, and cryptotanshinone in fresh Salvia Miltiorrhiza Bunge root without any pre-purification steps using 1H-NMR spectroscopy. The process is as follows: first, 70% methanol aqueous extracts of fresh Salvia Miltiorrhiza Bunge roots were quantitatively analyzed for tanshinone I, tanshinone IIA, dihydrotanshinone, and cryptotanshinone using 1H-NMR spectroscopy. Different internal standards were tested and the validated method was compared with HPLC. 3,4,5-trichloropyridine was chosen as the internal standard. Twelve samples of Salvia Miltiorrhiza Bunge were quantitatively analyzed by qNMR and HPLC respectively. Then, the results were analyzed by chemometric approaches. This NMR method offers a fast, stable, and accurate analysis of four ketones: tanshinone I, tanshinone IIA, dihydrotanshinone, and cryptotanshinone in fresh roots of Salvia Miltiorrhiza Bunge.

Study of macroaggregate composition using FT-IR and 1H-NMR spectroscopy

2002 ◽  
Vol 78 (4) ◽  
pp. 205-215 ◽  
Author(s):  
N Kovac ◽  
O Bajt ◽  
J Faganeli ◽  
B Sket ◽  
B Orel
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
1H Nmr Spectroscopy ◽  
Ft Ir

scholarly journals Metallation of tetradentate N2O2 Schiff base with Mn(II), Co(II), Cu(II) and Zn(II): synthesis, characterization and formation constants measurement

2010 ◽  
Vol 8 (2) ◽  
pp. 291-299 ◽  
Author(s):  
Mozaffar Asadi ◽  
Maryam Mohammadikish ◽  
Khosro Mohammadi
Keyword(s):  
Mass Spectrometry ◽  
Schiff Base ◽  
Ionic Strength ◽  
Nmr Spectroscopy ◽  
Elemental Analysis ◽  
1H Nmr Spectroscopy ◽  
Formation Constants ◽  
Free Energies ◽  
Schiff Base Ligands ◽  
Ft Ir

AbstractFour Schiff base ligands, salabza-H2 = N,N′-bis(salicylidene)-2-aminobenzylamine, were synthesized by condensation of one mole of 2-aminobenzylamine and two moles of salicylaldehyde and/or two moles of substituted salicylaldehyde (5-OMe, 5-Br, 5-NO2). All the four Schiff bases and their Mn(II), Co(II), Cu(II) and Zn(II) complexes are characterized by UV-Vis, FT-IR, 1H NMR spectroscopy, mass spectrometry and elemental analysis. The formation constants and the Gibbs free energies were measured spectrophotometrically for 1:1 complexes in methanol in constant ionic strength (I = 0.1 mol dm−3 NaClO4) and at 25°C. The data refinement was carried out with the SQUAD program. The trend of formation constants of H2L1 with M(II) follows the order: Mn(II) (3.97) Also, the trend of formation constants of ligand toward a given metal (for example Mn) is as follows: H2L1 (p-OMe) (3.97) > H2L2 (p-H) (3.65) > H2L3 (p-Br) (3.37) > H2L4 (p-NO2) (3.04)

SYNTHESIS AND EVALUATION OF SOME NEWER QUINAZOLINONYL SUBSTITUTED BENZOXAZEPINYL / BENZOTHIAZEPINYL INDOLES AS POTENT ANTICONVULSANT AGENTS

INDIAN DRUGS ◽  
2019 ◽  
Vol 56 (03) ◽  
pp. 18-24
Author(s):  
Archana ◽  
Keyword(s):  
Nmr Spectroscopy ◽  
Acute Toxicity ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Anticonvulsant Activity ◽  
1H Nmr Spectroscopy ◽  
Standard Drug ◽  
Anticonvulsant Agents ◽  
Phenytoin Sodium

new series of 3-[3-amino-2-methyl-6-substituted quinazolin-4(3H)-onyl chalconyl)-2-substituted indoles (3-8), 3-[3-Amino-2-methyl-6- substituted quinazolin-4(3H) -onyl-benzoxazepin/benzo -thiazepin- 2-yl] -2-substituted indoles (9-20) and 3-[3-amino-2-methyl-6-substituted quinazolin-4(3H) -onyl-3- (sub-stituted phenylaminomethylene) -benzoxazepin/benzothizepin-2-yl] -2-substitutedindoles (21-44) were synthesised and evaluated for anticonvulsant activity. All these compounds were screened in vivo, for their anticonvulsant activity and acute toxicity. Coumpund 44 , 3-[3-amino-2-methyl-6-bromoquinazolin- 4(3H)-onyl-3- (chlorophenylaminomethylene)-benzothiazepine-2-yl]-2-chloroindole, was found to be most potent compound of this series , more potent than standard drug phenytoin sodium. The homogeneity of all the compounds have been established by elemental analysis, IR and 1H-NMR spectroscopy.

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