scholarly journals Liquid Chromatographic and Mass Spectral Methods of Identification for the Regioisomeric 2,3- and 3,4-Methylenedioxyphenalkylamines

1998 ◽  
Vol 36 (3) ◽  
pp. 131-138 ◽  
Author(s):  
J. DeRuiter ◽  
P. L. Holston ◽  
C. R. Clark ◽  
F. T. Noggle
Keyword(s):  
Spectral Methods ◽  
Mass Spectral ◽  
Liquid Chromatographic

An Elegant Synthetic Route to 3-Cyano-5,6-dihydro-2-ethoxy-4-phenyl-pyrido[2,3-a]carbazoles

2004 ◽  
Vol 59 (1) ◽  
pp. 106-108 ◽  
Author(s):  
Isravel A. Danish ◽  
Karnam J. R. Prasad
Keyword(s):  
Elemental Analysis ◽  
Spectral Methods ◽  
Title Compound ◽  
Sodium Hydride ◽  
Synthetic Route ◽  
Mass Spectral ◽  
Plausible Mechanism

Abstract 2-Benzylidene-1-oxo-1,2,3,4-tetrahydrocarbazoles (1a - e) obtained from the corresponding 1- oxo-1,2,3,4-tetrahydrocarbazoles on reaction with malononitrile in dry benzene with sodium hydride afforded 3-cyano-5,6-dihydro-2-ethoxy-4-phenyl-pyrido[2,3-a]carbazoles (2a - e) in good yields. A plausible mechanism for the formation of the title compound has been proposed and all the compounds were characterised by IR, NMR, mass spectral methods and elemental analysis.

Electron capture gas-liquid chromatographic-mass spectral identification of acids produced by Neisseria meningitidis in a defined medium

1979 ◽  
Vol 9 (1) ◽  
pp. 97-102
Author(s):  
C C Alley ◽  
J B Brooks ◽  
D S Kellogg
Keyword(s):  
Liquid Chromatography ◽  
Neisseria Meningitidis ◽  
Electron Capture ◽  
Defined Medium ◽  
Gas Liquid Chromatography ◽  
Mass Spectral ◽  
Spectral Identification ◽  
Acid Metabolites ◽  
Liquid Chromatographic ◽  
Chromatographic Mass

The acid metabolites and the cellular fatty acids of three strains of Neisseria meningitidis grown in a chemically defined liquid medium were determined with computerized frequency-pulsed electron capture gas-liquid chromatography. Five acids not previously reported were subsequently identified: isobutyric, octanoic, decenoic (C10:1), dodecenoic (C12:1), and tetradecenoic (C14:1). These acids were produced during active metabolism and were not detected as cellular constituents. The frequency-pulsed electron capture gas-liquid chromatography methods which we used provide a rapid, reliable, sensitive means of detecting both these and other metabolic and cellular acids in spent culture medium.

Biosynthetic studies on gliotoxin using stable isotopes and mass spectral methods

1968 ◽  
Vol 90 (4) ◽  
pp. 1038-1041 ◽  
Author(s):  
Ajay K. Bose ◽  
K. Ganesh. Das ◽  
Phillip T. Funke ◽  
Irene. Kugajevsky ◽  
O. P. Shukla ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Spectral Methods ◽  
Mass Spectral ◽  
Biosynthetic Studies

Synthesis of isothiocyanates from non-aromatic nitrogen-containing heterocycles

1986 ◽  
Vol 51 (1) ◽  
pp. 112-117 ◽  
Author(s):  
Jozef Gonda ◽  
Pavol Kristian ◽  
Ľubomír Mikler
Keyword(s):  
Spectral Methods ◽  
Mass Spectral ◽  
H Nmr ◽  
C Nmr

Investigation of the reaction of thiophosgene with Δ2-oxazolines I, Δ3-thiazolines II, 4H-benzo[d][1,3]thiazines III, 2-methoxypentahydro-Δ1-azepine IV, theophylline and caffeine showed that only compounds I and IV reacted to give 2-acyloxyethyl isothiocyanates and methyl 6-isothiocyanatohexanoate. The structure of these products was corroborated by IR, 1H NMR, 13C NMR and mass spectral methods. The suitability of the above-mentioned compounds to react is discussed.

Combined Gas-Liquid Chromatographic Mass Spectrometric Analysis of Some Commercial Aryl Phosphate Oils

1978 ◽  
Vol 61 (2) ◽  
pp. 266-271
Author(s):  
Padmakar G Deo ◽  
Philip H Howard
Keyword(s):  
Fire Retardant ◽  
Phosphate Esters ◽  
Spectrometric Analysis ◽  
Gas Liquid Chromatography ◽  
Mass Spectral Data ◽  
Mass Spectral ◽  
Hydraulic Fluids ◽  
Alkyl Phenols ◽  
Liquid Chromatographic ◽  
Chromatographic Mass

Abstract Five commercial samples of synthetic aryl phosphate oils, which are widely used as fire retardant hydraulic fluids and as flame retardant plasticizers, have been analyzed by combined gas-liquid chromatography/mass spectrometry (GLC/MS). Each sample contained at least 4 isomers of aryl phosphate esters. The peaks were identified by a close examination of the mass spectral data and, wherever possible, by comparing retention times of the peaks with those of either the purchased or synthesized compounds. One aryl phosphate hydraulic fluid contained a small amount of a hydrocarbon. The results indicate that most of the aryl phosphate esters in the commercial samples were formed from phenol, cresols, xylenols, and other alkyl phenols. No free phenols could be detected in the samples analyzed.

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