scholarly journals Phosphorylation of Nucleosides with Phosphorus Oxychloride in Trialkyl Phosphate.

1995 ◽  
Vol 43 (2) ◽  
pp. 210-215 ◽  
Author(s):  
Tomomi IKEMOTO ◽  
Akira HAZE ◽  
Hiroyuki HATANO ◽  
Yoshifumi KITAMOTO ◽  
Masato ISHIDA ◽  
...  
Keyword(s):  
Phosphorus Oxychloride ◽  
Trialkyl Phosphate

Formylation of the Dimethoxygenzenes Using Phosphorus Oxychloride and N-Methylformanilide

1952 ◽  
Vol 74 (21) ◽  
pp. 5546-5546 ◽  
Author(s):  
Armiger H. Sommers ◽  
R. J. Michaels ◽  
Arthur W. Weston
Keyword(s):  
Phosphorus Oxychloride

scholarly journals Rapid and Efficient Synthesis ofω-Alkylenediphosphoric Acids from Phosphorus Oxychloride

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Dalila Meziane ◽  
Abdelhamid Elias ◽  
Erwann Guénin
Keyword(s):  
Microwave Irradiation ◽  
Reaction Temperature ◽  
Phosphorus Oxychloride ◽  
Molar Ratio ◽  
Efficient Synthesis ◽  
Selective Method

The aim of this investigation was to develop an efficient, rapid, and selective method for the synthesis ofω-alkylenediphosphoric acids (HO)2(O)P-O-CH2n-O-P(O)(OH)2from reaction of several diols with phosphorus oxychloride. The reaction was investigated using three methodologies: (i) presence of a base, (ii) classical heating, and (iii) use of microwave irradiation. Influence of reaction temperature and molar ratio of reagents, as well as the nature of the solvent, was studied using these three different methods.

Influence of the synthesis method of tert-butylated triphenyl phosphates on the operational properties of fire-resistant fluids

2021 ◽  
Vol 02 ◽  
pp. 32-37
Author(s):  
A.S. Medzhibovskiy ◽  
◽  
A.S. Kolokolnikov ◽  
A.O. Savchenko ◽  
G.A. Poldushova ◽  
...  
Keyword(s):  
Gas Turbines ◽  
Power Plants ◽  
Phosphorus Oxychloride ◽  
Raw Materials ◽  
Hydrolytic Stability ◽  
Synthesis Method ◽  
Acid Number ◽  
Release Time ◽  
Triphenyl Phosphate ◽  
Prolonged Contact

Three substituted aryl esters of orthophosphoric acid are the base component of fire-resistant fluids used in the lubricating and electro-hydraulic control system at steam and gas turbines of power plants. In this paper, we studied the possibility of improving the physicochemical and performance properties of phosphates, which are made of the raw materials available in the Russian Federation: phenol and 4-tert-butylphenol by reducing the content of an undesirable component - unsubstituted triphenyl phosphate, which is particularly vulnerable towards water. According to the results of the work, the conclusions were made: - a decrease in the content of triphenyl phosphate to a level of 1% and below leads to some improvement (reduction) of the air release time and an increase in the hydrolytic stability (represented as reducing the change in acid number after prolonged contact with water) of the fire-resistant fluid based on mixed esters. The degree of change of these properties is quantified. - it is possible to achieve the minimum content of triphenyl phosphate by changing the phosphorylation technology. By carrying out the process stepwise, the possibility of the interaction of phosphorus oxychloride with unsubstituted phenol is substantially eliminated, that is why there is almost no probability of an undesirable component formation in the resulting mixture of esters.

The Meisenheimer rearrangement in heterocyclic synthesis. II. Synthesis and X-ray crystal structure of a tetrahydro-1H-2,3-benzoxazocine and preparation of a hexahydro-2,3-benzoxazonine

1980 ◽  
Vol 33 (6) ◽  
pp. 1323 ◽  
Author(s):  
JB Bremner ◽  
EJ Browne ◽  
PE Davies ◽  
CLWAH Raston
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Acetic Acid ◽  
Crystal And Molecular Structure ◽  
Phosphorus Oxychloride ◽  
Crystallographic Analysis ◽  
Heterocyclic Synthesis ◽  
Reaction Conditions ◽  
X Ray ◽  
Heterocyclic Derivatives

The heterocyclic derivatives, 8,9-dimethoxy-3-methyl-1-phenyl-3,4,5,6- tetrahydro-1H-2,3-benzoxazocine(3a) and 9,10-dimethoxy-3-methyl-1- phenyl-1,3,4,5,6,7-hexahydro-2,3-benzoxazonine (3b),examples of two new ring systems, have been prepared by Meisenheimer rearrangement of the corresponding 2-benzazepine and 2-benzazocine N-oxide derivatives (2a) and (2b). The Bischler-Napieralski-type cyclization reaction was used in the preparation of the tertiary amine precursors of these N-oxides reaction conditions for the cyclization were critical and phosphorus oxychloride in refluxing butanenitrile was found to give the best yields of the seven- or eight-membered cyclic imine intermediates. Reductive cleavage of the benzoxazocine derivative (3a) with zinc in acetic acid followed by N-methylation gave the expected product, [2-{3- (dimethylamino)propyl}-4,5-di-methoxyphenyl]phenylmethanol (12). The crystal and molecular structure of (3a) has been determined by X-ray crystallographic analysis.

Comparison of diffused layer prepared using liquid dopant solutions and pastes for solar cell with screen printed electrodes

2016 ◽  
Vol 33 (3) ◽  
pp. 167-171 ◽  
Author(s):  
Kazimierz Drabczyk ◽  
Edyta Wróbel ◽  
Grazyna Kulesza-Matlak ◽  
Wojciech Filipowski ◽  
Krzysztof Waczynski ◽  
...  
Keyword(s):  
Solar Cells ◽  
Ethyl Alcohol ◽  
Diffusion Processes ◽  
Phosphorus Oxychloride ◽  
Low Cost ◽  
Content Type ◽  
Base Solution ◽  
Different Types ◽  
Main Components ◽  
Two Stages

Purpose The purpose of this study is comparison of the diffusion processes performed using the commercial available dopant paste made by Filmtronics and the original prepared liquid dopant solution. To decrease prices of industrially produced silicon-based solar cells, the new low-cost production processes are necessary. The main components of most popular silicon solar cells are with diffused emitter layer, passivation, anti-reflective layers and metal electrodes. This type of cells is prepared usually using phosphorus oxychloride diffusion source and metal pastes for screen printing. The diffusion process in diffusion furnace with quartz tube is slow, complicated and requires expensive equipment. The alternative for this technology is very fast in-line processing using the belt furnaces as an equipment. This approach requires different dopant sources. Design/methodology/approach In this work, the diffusion processes were made for two different types of dopant sources. The first one was the commercial available dopant paste from Filmtronics and the second one was the original prepared liquid dopant solution. The investigation was focused on dopant sources fabrication and diffusion processes. The doping solution was made in two stages. In the first stage, a base solution (without dopants) was made: dropwise deionized (DI) water and ethyl alcohol were added to a solution consisting of tetraethoxysilane (TEOS) and 99.8 per cent ethyl alcohol. Next, to the base solution, orthophosphoric acid dissolved in ethyl alcohol was added. Findings Diffused emitter layers with sheet resistance around 60 Ω/sq were produced on solar grade monocrystalline silicon wafers using two types of dopant sources. Originality/value In this work, the diffusion processes were made for two different types of dopant sources. The first one was the commercial available dopant paste from Filmtronics and the second one was the original prepared liquid dopant solution.

Pyrimidines.9. Chlorination of 6-trifluoromethyluracil with phosphorus oxychloride in the presence of trialkylamines

1987 ◽  
Vol 24 (5) ◽  
pp. 1243-1247 ◽  
Author(s):  
Herman Gershon ◽  
Anthony T. Grefig ◽  
Donald D. Clarke
Keyword(s):  
Phosphorus Oxychloride

scholarly journals On the Reactions in Solutions of Phosphorus Oxychloride.

1958 ◽  
Vol 12 ◽  
pp. 135-135 ◽  
Author(s):  
Ingvar Lindqvist ◽  
Gunnar Ågren ◽  
Anders Norrby ◽  
Lars Svennerholm ◽  
L. Ernster ◽  
...  
Keyword(s):  
Phosphorus Oxychloride
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