Study of hydrogenation of petroleum asphaltenes

1981 ◽  
Vol 46 (2) ◽  
pp. 409-418 ◽  
Author(s):  
Gustav Šebor ◽  
Salvador Reynoso ◽  
Milan Hájek ◽  
Otto Weisser ◽  
Jiří Mostecký
Keyword(s):  
Temperature Region ◽  
Catalytic Hydrogenation ◽  
Starting Material ◽  
Type Analysis ◽  
H Nmr ◽  
Petroleum Asphaltenes

Isolated petroleum asphaltenes were subjected to model thermal and catalytic hydrogenation experiments in the temperature region 300-450° C. The course of hydrogenation of the asphaltenes studied is discussed based on 1H-NMR type analysis of the starting material and the hydrogenation products.

Synthesis and Characterisation of Novel 4-Chloro-16E-Benzylidene Steroidal Derivatives

2017 ◽  
Vol 41 (11) ◽  
pp. 650-652
Author(s):  
Ning-Juan Fan ◽  
Xin-Wei Shi ◽  
Yuan-Feng Li ◽  
Qiu-Rui He ◽  
Jiang-Jiang Tang
Keyword(s):  
Starting Material ◽  
H Nmr ◽  
Steroidal Derivatives ◽  
C Nmr

Using androstenedione as the starting material, we have synthesised 11 novel 4-chloro-16-( E)-benzylidene androst-1,4-diene-3,17-dione derivatives. All the final products are novel and were identified by 1H NMR, 13C NMR and HRMS spectrometry.

Acid Reactions of Lignin Models of β-5 Type

Holzforschung ◽  
1999 ◽  
Vol 53 (1) ◽  
pp. 39-42 ◽  
Author(s):  
S. Li ◽  
K. Lundquist
Keyword(s):  
Sulfonic Acid ◽  
Starting Material ◽  
Acid Catalysts ◽  
Reaction Products ◽  
Milled Wood Lignin ◽  
H Nmr ◽  
Stilbene Derivative ◽  
Trifluoromethane Sulfonic Acid ◽  
Spectrometric Measurements ◽  
Adjacent Unit

Summary Refluxing of trans–2-(3,4-dimethoxyphenyl)-3-hydroxymethyl-7-methoxy-2,3-dihydrobenzo[b]furan with dioxane-water (9 : 1) in the presence of various acid catalysts led to the formation of 2-(3,4-dimethoxyphenyl)- 7-methoxy-3-methylbenzo[b]furan, the trans and cis forms of 2-hydroxy-3,3′4′-trimethoxystilbene and cis–2-(3,4-dimethoxyphenyl)-3-hydroxymethyl-7-methoxy-2,3-dihydrobenzo[b]furan. The proportions of the products were strongly dependent on the particular acid used as catalyst. HCl and to a greater extent HBr favored the formation of the 2-arylbenzofuran (phenylcoumarone) while the trans-stilbene derivative predominated in reaction products from the experiments with trifluoromethane sulfonic acid as the catalyst. Isomerization of the starting material occurred, regardless of the nature of the catalyst (small amounts of the cis-isomer formed). The number of phenylpropane units in spruce lignin attached to an adjacent unit by a β−5 linkage was estimated to be 6–9% on the basis of 1H NMR spectrometric measurements of the formation of phenylcoumarone structures on refluxing of milled wood lignin from spruce with 0.1M HBr in dioxane-water (9 : 1).

scholarly journals Hydrogenation of the liquid organic hydrogen carrier compound dibenzyltoluene – reaction pathway determination by 1H NMR spectroscopy

2016 ◽  
Vol 1 (3) ◽  
pp. 313-320 ◽  
Author(s):  
G. Do ◽  
P. Preuster ◽  
R. Aslam ◽  
A. Bösmann ◽  
K. Müller ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Hydrogen Storage ◽  
1H Nmr ◽  
Catalytic Hydrogenation ◽  
1H Nmr Spectroscopy ◽  
Reaction Pathway ◽  
H Nmr ◽  
Hydrogen Carrier

The catalytic hydrogenation of the LOHC compound dibenzyltoluene (H0-DBT) was investigated by 1H NMR spectroscopy in order to elucidate the reaction pathway of its charging process with hydrogen in the context of future hydrogen storage applications.

scholarly journals Preparation and Crystal Structure of 1,2-Bis(2,5-Dimethylthiophen-3-Yl)ethane-1,2-Dione

2019 ◽  
Author(s):  
Paweł Pakulski ◽  
Dawid Pinkowicz
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Starting Material ◽  
Nmr Spectrum ◽  
H Nmr

Preparation, crystal structure and <sup>1</sup>H NMR spectrum of 1,2-bis(2,5-dimethylthiophen-3-yl)ethane-1,2-dione is reported. The title compound is a convenient starting material for the preparation of photochromic diarylethenes with various backbones.<br>

Isomerisierung von Pd–O=PR3-koordiniertem ο,o′-Bis(phenyläthinyl)-triphenylphosphinoxid.

1976 ◽  
Vol 31 (8) ◽  
pp. 1116-1121 ◽  
Author(s):  
Werner Winter
Keyword(s):  
Catalytic Hydrogenation ◽  
Kinetic Data ◽  
Conformational Stability ◽  
Ring Inversion ◽  
X Ray ◽  
Conformational Isomers ◽  
H Nmr

Conformational Stability, 1H NMRo,o′-Bis(phenylethynyl)-triphenylphosphineoxide, coordinated to Pd(II) with the P=0-group, is isomerized in boiling xylene to the condensed phosphepin- and dihydrophosphocin oxides (4) and (6). The structure of 6 is determined by catalytic hydrogenation, 1H NMR and confirmed by an X-ray analysis, currently carried out. The hydrogenated products 7A and 7B are conformational isomers. The kinetic data of the ring inversion 7 A ⇄ 7B are determined.

Hydrogenation derivatives of rifampicin; Their tritium labelling

1979 ◽  
Vol 44 (5) ◽  
pp. 1671-1675
Author(s):  
Jan Hanuš ◽  
Jaroslav Kozel ◽  
Josef Beneš ◽  
Petr Sedmera
Keyword(s):  
Nmr Spectroscopy ◽  
Catalytic Hydrogenation ◽  
H Nmr ◽  
Derivatives Of

The structures of four rifampicin derivatives obtained by its catalytic hydrogenation were determined by mass and 1H NMR spectroscopy. These are 16,17- and 18,19-dihydrorifampicin, its Δ17,18-isomer and 16,17,18,19-tetrahydrorifampicin. The Δ18,19- and Δ17,18-rifampicins were labelled by tritium.

scholarly journals 5-Amino-5-deoxy-2-C-hydroxymethyl-2,3-O-isopropylidene-L-lyxono-1,5-lactam

2007 ◽  
Vol 63 (3) ◽  
pp. o1409-o1411
Author(s):  
Michela Simone ◽  
George W. J. Fleet ◽  
Richard Bream ◽  
David J. Watkin
Keyword(s):  
Absolute Configuration ◽  
Catalytic Hydrogenation ◽  
Title Compound ◽  
Crystallographic Analysis ◽  
Starting Material ◽  
Relative Configuration ◽  
X Ray ◽  
Compound C ◽  
The Absolute

The relative configuration of the title compound, C9H14NO5, formed by catalytic hydrogenation of an azidolactone, has been established by X-ray crystallographic analysis. The absolute configuration was determined by the use of 2,3-O-isopropylidene-L-lyxono-1,4-lactone as the carbohydrate starting material.

scholarly journals Synthesis, Evaluation and Characterization of Some 1,3,4-Triazole-2-one Derivatives as Antimicrobial Agents

2012 ◽  
Vol 9 (4) ◽  
pp. 2407-2414 ◽  
Author(s):  
Mahabaleshwaraiah Neelgundmath ◽  
Oblennavar Kotresh
Keyword(s):  
Acetic Anhydride ◽  
Elemental Analysis ◽  
Antimicrobial Agents ◽  
Polar Solvent ◽  
Starting Material ◽  
Chloroacetyl Chloride ◽  
H Nmr ◽  
Anti Inflammatory

A series of novel compounds like 3[(phenyl substituted)-5-methyl-1(Benzosulphonylamine)]-1,3,4-triazole-2-ones II(a-f) were synthesized by treating 4-amino-1-phenyl-3-methyl-5-oxo-1,2,4-triazoles with benzene sulphonyl chloride using pyridine as solvent. Similarly by using 4-amino-1-aryl-3-methyl-5-oxo-1,2,4-triazoles and acetic anhydride as starting material 3[(phenyl substituted)-5-methyl-1(acetylamino)]-1,3,4-triazole-2-ones III(a-f) were synthesized and also 3[(phenyl substituted)-5-methyl-1(chloroacetyl)]-1,3,4-triazole-2-ones I(a-f) were synthesized by treating 4-amino-1-aryl-3-methyl-5-oxo-1,2,4-triazoles with chloroacetyl chloride in presence of a non-polar solvent like benzene. Elemental analysis, GCMS, IR, and1H NMR confirmed the structures of the newly synthesised compounds. The newly synthesized compounds are also screened for their antibacterial, antifungal and anti-inflammatory activities.

Synthesis of 3-Methyl-1-[2-(1-Piperidiny) Phenyl]-butyl Amine

2011 ◽  
Vol 396-398 ◽  
pp. 1527-1530
Author(s):  
Hui Xian Liu ◽  
Dao Wei Huang ◽  
Yue Zhang
Keyword(s):  
Catalytic Hydrogenation ◽  
Environmental Problems ◽  
Grignard Reaction ◽  
Oral Medicine ◽  
H Nmr ◽  
Environmental Friendly ◽  
Important Intermediate ◽  
Butyl Amine ◽  
Work Up ◽  
C Nmr

3-Methyl-1-[2-(1-piperidiny) phenyl]-butyl amine (1) is an important intermediate for synthesis of Repaglinide, a well-known oral medicine for diabetes. It has been reported that 1 could be obtained from o-flurobenzaldehyde undergoing Grignard reaction, oxidition, piperidine substitution, oximation and reduction. In the process of reduction, the oximate 3-methyl-1-[2-(1-piperidiny) phenyl]-butyl oxime (6) was reduced by NiCl2-NaBH4 with many impurities, difficult workup, low yield and a lot of environmental problems. Herein the environmental friendly catalytic hydrogenation with simple work-up was developed and the yield was of 95.5%. The structure of 1 has been confirmed by IR, 1H NMR, 13C NMR.

scholarly journals Preparation and Crystal Structure of 1,2-Bis(2,5-Dimethylthiophen-3-Yl)ethane-1,2-Dione

2019 ◽  
Author(s):  
Paweł Pakulski ◽  
Dawid Pinkowicz
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Starting Material ◽  
Nmr Spectrum ◽  
H Nmr

Preparation, crystal structure and <sup>1</sup>H NMR spectrum of 1,2-bis(2,5-dimethylthiophen-3-yl)ethane-1,2-dione is reported. The title compound is a convenient starting material for the preparation of photochromic diarylethenes with various backbones.<br>

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