scholarly journals Determination of Methyl and Phenyl Groups in Methyl-Phenyl-Siloxane Polymer byNMRSpectroscopy

1960 ◽  
Vol 33 (1) ◽  
pp. 70-73 ◽  
Author(s):  
Tsutomu Kubota ◽  
Tsutomu Takamura
Keyword(s):  
Siloxane Polymer ◽  
Methyl Phenyl

Determination of electron inelastic mean free paths for poly[methyl(phenyl)silylene] films

Polymer ◽  
2009 ◽  
Vol 50 (11) ◽  
pp. 2445-2450 ◽  
Author(s):  
J. Zemek ◽  
J. Houdkova ◽  
P. Jiricek ◽  
A. Jablonski ◽  
V. Jurka ◽  
...  
Keyword(s):  
Methyl Phenyl

Determination of biogenic halogenated methyl-phenyl ethers (halogenated anisoles) in the picogram m -3 range in air

1996 ◽  
Vol 354 (3) ◽  
pp. 333-343
Author(s):  
Ursula F�hrer ◽  
Angela Dei�ler ◽  
K. Ballschmiter
Keyword(s):  
Phenyl Ethers ◽  
Methyl Phenyl

scholarly journals Development and Validation of RP-Chiral HPLC Method for Determination of (R)-Enantiomer Excess Content in Efavirenz

2020 ◽  
Vol 32 (9) ◽  
pp. 2208-2212
Author(s):  
CH. RAMESH ◽  
DHARMASOTH RAMA DEVI DEVI ◽  
M.N.B. SRINIVAS ◽  
S. RADHA KRISHNA ◽  
NAGARAJU RAJANA ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Hplc Method ◽  
Chiral Hplc ◽  
Reverse Phase ◽  
Limit Of Quantification ◽  
Column Temperature ◽  
Enantiomer Excess ◽  
Development And Validation ◽  
Methyl Phenyl

simple, specific, linear, accurate and precise reverse phase chiral HPLC method was developed for the separation of efavirenz enantiomers by using the Lux Amylose-2 column containing amylose tris(5-chloro-2-methyl phenyl carbamate) as a stationary phase. The mobile phase consists of 0.1 % formic acid in water and acetonitrile (55:45, v/v). The flow rate was kept at 1.0 mL/min and the detection wavelength used 252 nm and the column temperature was set at 25 ºC. The limit of detection was 0.01 mg/mL and the limit of quantification was 0.04 mg/mL. The linearity calibration curve of (R)-enantiomer was shown well from the range of 0.04 mg/mL to 0.4 mg/mL. The values of the correlation coefficient were 0.999 and 0.999 for (R)-enantiomer and (S)-efavirenz, respectively. The percentage recoveries of (R)-enantiomer from efavirenz drug substance were ranged from 93.5% to 107.5%. The results demonstrated that developed RP-chiral HPLC method was simple, precise, robust and applicable for the estimation of (R)-enantiomer in efavirenz API. This method was validated in as per ICH Q2 (R1) and USP validation of compendial methods <1225>.

Simultaneous gas-chromatographic analysis for phenobarbital, diphenylhydantoin, carbamazepine, and primidone in serum.

1976 ◽  
Vol 22 (6) ◽  
pp. 769-771 ◽  
Author(s):  
C V Abraham ◽  
H D Joslin
Keyword(s):  
Chromatographic Analysis ◽  
Limit Of Detection ◽  
Internal Standard ◽  
Peak Height ◽  
Gas Liquid Chromatography ◽  
Toxic Concentration ◽  
Sensitive Determination ◽  
Derivatives Of ◽  
Methyl Phenyl

Abstract We describe a simple, sensitive determination of phenobarbital, diphenylhydantoin, carbamazepine, and primidone in serum, by use of gas-liquid chromatography with temperature programming. The methylated derivatives of these anticonvulsants are well resolved, as was 5-(p-methyl-phenyl)-5-phenylhydantoin, the internal standard. The proposed procedure requires only 0.20 ml of serum and can be done in less than 30 min. The lower limit of detection for each of the drugs is 0.5 mg/liter. Analytical recoveries of drug from serum were excellent and peak height and concentration were linearly related up to twice the toxic concentration for serum.

Vier- und fünfgliedrige Phosphorheterocyclen, XXXVIII [1] Azaphospholo-benzoxazaphosphole - Synthese, Prototropie und Struktur / Four- and Five - membered Phosphorus Heterocycles, XXXVIII [1] Azaphospholo-benzoaxazaphospholes - Preparation, Proton Shift and Structure

1979 ◽  
Vol 34 (7) ◽  
pp. 906-910 ◽  
Author(s):  
Alfred Schmidpeter ◽  
Josef Helmut Weinmaier
Keyword(s):  
Structure Determination ◽  
Cinnamic Aldehyde ◽  
X Ray ◽  
Proton Shift ◽  
Trigonal Bipyramidal ◽  
Bicyclic Structure ◽  
Bicyclic System ◽  
Methyl Phenyl ◽  
The Ideal

Abstract The o-hydroxyanile of cinnamic aldehyde reacts with methyl, phenyl, oxy-, and aminochlorophosphanes in a combined substitution and oxidative addition to give phosphoranes with the above mentioned bicyclic structure containing phosphorus as bridgehead. For the aminosubstituted species the reaction is followed by a 1.3 proton shift in the C3 moiety from the cinnamic aldehyde. Whether the bicyclic system occupies meridional of facial positions of the phosphorus trigonal bipyramid is shown to depend on the nature of the phosphorus substituents. An X - ray structure determination of a tricyclic derivative with axial annelation shows the deviation from the ideal trigonal bipyramidal geometry to lie on the Berry pseudorotion pathway

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