ChemInform Abstract: SYNTHESIS OF ANHYDROSIBIROMYCINONE: A NEW METHOD FOR THE DIRECT SYNTHESIS OF PYRROLO-1,4-BENZODIAZEPIN-5-ONES

1979 ◽  
Vol 10 (33) ◽  
Author(s):  
K. A. PARKER ◽  
T. H. FEDYNYSHYN
Keyword(s):  
Direct Synthesis ◽  
New Method

A Novel Method for the Direct Synthesis of Symmetrical and Unsymmetrical Sulfides and Disulfides from Aryl Halides and Ethyl Potassium Xanthogenate

Synlett ◽  
2018 ◽  
Vol 29 (07) ◽  
pp. 986-992 ◽  
Author(s):  
M. Soleiman-Beigi ◽  
Z. Arzehgar
Keyword(s):  
Direct Synthesis ◽  
Aryl Halides ◽  
New Method ◽  
Alkyl Aryl ◽  
Novel Method ◽  
Aryl Sulfides ◽  
Bunte Salts

An efficient and new method for the synthesis of disulfides and sulfides via the reaction of aryl halides with ethyl potassium xanthogenate in the presence of MOF-199 is described. O-Ethyl-S-aryl ­carbonodithioate has a key role as an intermediate in this procedure; it was converted into symmetrical diaryl disulfides in DMF. Additionally, this could be applied to the synthesis of unsymmetrical aryl alkyl(aryl′) disulfides by the reaction with S-alkyl(aryl) sulfurothioates (Bunte salts) as well as unsymmetrical aryl alkyl(aryl′) sulfides in DMSO.

Preparation of Lead Iodide as Input Material for X-Ray Detectors

2005 ◽  
Vol 480-481 ◽  
pp. 477-482 ◽  
Author(s):  
M. Matuchová ◽  
Olga Prochazková ◽  
K. Zdanský ◽  
J. Zavadil ◽  
J. Maixner
Keyword(s):  
Direct Synthesis ◽  
New Method ◽  
Lead Iodide ◽  
X Ray ◽  
New Methods ◽  
Input Material ◽  
Zone Purification

The aim of this work is to study the new method of direct synthesis of lead and iodine as the input material of PbI2. This method has not been studied for this material till now, and seems to be one of the new methods for preparation of the input material. The photoluminescence measurement and measurement of resistivity has been done and compared with the measurements done by precipitation and zone purification.

A New Method for Estimating Average Reservoir Pressure: The Muskat Plot Revisited

2008 ◽  
Vol 11 (02) ◽  
pp. 298-306 ◽  
Author(s):  
James G. Crump ◽  
Robert H. Hite
Keyword(s):  
Direct Synthesis ◽  
New Method ◽  
Theoretical Ground ◽  
Time Behavior ◽  
Reservoir Pressure ◽  
Reservoir Properties ◽  
Pressure Derivative ◽  
Pressure Buildup ◽  
Heterogeneous Reservoirs ◽  
Fluid Properties

Summary This paper describes a new method for estimating average reservoir pressure from long-pressure-buildup data on the basis of the classical Muskat plot. Current methods for estimating average reservoir pressure require a priori information about the reservoir and assume homogeneous reservoir properties or use empirical extrapolation techniques. The new method applies to heterogeneous reservoirs and requires no information about reservoir or fluid properties. The idea of the method is to estimate from the pressure derivative the first few eigenvalues of the pressure-transient decay modes. These values are characteristic of the reservoir and fluid properties, but not of the pressure history or well location in the reservoir. The smallest eigenvalue is used to extrapolate the long-time behavior of the transient to estimate the final reservoir pressure. The second eigenvalue can be used to estimate the quality of the estimate. Numerical tests of the method show that it estimates average reservoir pressure accurately, even when the reservoir is heterogeneous or when partial-flow barriers are present. Examples with real data show that the behavior predicted by the theory is actually observed. We expect the method to have value in reservoir limits testing, in making consistent estimates of average reservoir pressure from permanent downhole gauges, and in characterizing complex reservoirs. Introduction Several different methods of interpreting pressure-buildup data to obtain average reservoir pressure have been proposed (Muskat 1937; Horner 1967; Miller et al. 1950; Matthews et al. 1954; Dietz 1965) in the past, and in recent years some new techniques have appeared in the literature (Mead 1981; Hasan and Kabir 1983; Kabir and Hasan 1996; Kuchuk 1999; Chacon et al. 2004). Larson (1963) revisited the Muskat method and put it on a firm theoretical ground for a homogeneous cylindrical reservoir. Some of the existing techniques depend on knowledge of the reservoir size and shape and assume homogeneous properties (Horner 1967; Miller et al. 1950; Matthews et al. 1954; Dietz 1965). Such methods may result in uncertain predictions when reservoir data are unavailable or reservoir heterogeneity exists. The inverse time plot by Kuchuk (1999) is essentially a modification of Horner's method (1967) and works well in reservoirs that can be treated as infinite during the time of the test. The hyperbola method proposed by Mead (1981) and further developed by Hasan and Kabir (1983) is an empirical technique, not based on fundamental fluid flow principles for bounded reservoirs (Kabir and Hasan 1996). Chacon et al. (2004) develop the direct synthesis technique, in which conventional theory is used to derive an average pressure directly from standard log-log plots. Homogeneous properties and radial symmetry are assumed. Muskat's original derivation was a wellbore storage model. Larson reinterpreted Muskat's method and derived relationships showing how Muskat's plot could be used to estimate average reservoir pressure in a cylindrical, homogeneous reservoir. This paper revisits the ideas underlying Larson's paper. Similar ideas are shown to hold for heterogeneous reservoirs of any shape. A new analysis technique replacing the Muskat plot by a plot of the pressure derivative simplifies the determination of average reservoir pressure. It is shown that parameters from analysis of a long buildup on a reservoir can be used in subsequent buildup tests to shorten the required time of the subsequent buildups. Finally, estimates for time required for a buildup in homogeneous reservoirs of any shape are given.

scholarly journals A new method for the synthesis of diamantane by hydroisomerization of binor-S on treatment with sulfuric acid

2020 ◽  
Author(s):  
Rishat Aminov ◽  
Ravil I Khusnutdinov
Keyword(s):  
Sulfuric Acid ◽  
Homologous Series ◽  
Direct Synthesis ◽  
New Method ◽  
Concentrated Sulfuric Acid

A new method was developed for the direct synthesis of the second representative of the homologous series of diamond-like hydrocarbons, diamantane, in 65% yield by hydroisomerization of norbornadiene dimer, endo-endo-heptacyclo[8.4.0.02,12.03,8.04,6.05,9.011,13]tetradecane (binor-S) on treatment with concentrated sulfuric acid (98%). In the presence of H2SO4 of lower concentration (75-80%), the reaction stops after hydrogenation step giving endo-endo-pentacyclo[7.3.1.12,5.18,10]tetradecane in 68% yield.

scholarly journals A new method for the synthesis of diamantane by hydroisomerization of binor-S on treatment with sulfuric acid

2020 ◽  
Vol 16 ◽  
pp. 2534-2539
Author(s):  
Rishat I Aminov ◽  
Ravil I Khusnutdinov
Keyword(s):  
Sulfuric Acid ◽  
Homologous Series ◽  
Direct Synthesis ◽  
New Method ◽  
Concentrated Sulfuric Acid ◽  
Excellent Selectivity

A new method was developed for the direct synthesis of the second representative of the homologous series of diamond-like hydrocarbons, diamantane, in 65% yield by hydroisomerization of the norbornadiene dimer, endo-endo-heptacyclo[8.4.0.02,12.03,8.04,6.05,9.011,13]tetradecane (binor-S) on treatment with concentrated sulfuric acid (98%). In the presence of H2SO4 of lower concentration (75–80%), the reaction stops after the hydrogenation step giving endo-endo-pentacyclo[7.3.1.12,5.18,10.03,7]tetradecane in 68% yield with excellent selectivity (100%).

A new method for direct synthesis of Li2CO3 powders by membrane electrolysis

Rare Metals ◽  
2018 ◽  
Vol 37 (8) ◽  
pp. 716-722 ◽  
Author(s):  
Xi-Juan Pan ◽  
Ting-An Zhang ◽  
Zhi-He Dou ◽  
Guo-Zhi Lyu ◽  
Xiu-Xiu Han ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
New Method ◽  
Membrane Electrolysis
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