scholarly journals The Oils from Stems, Leaves and Roots of Elephantopus scaber Linn.

2016 ◽  
Vol 6 (1) ◽  
pp. 46-49
Author(s):  
Mohd Alhafiizh Zailani ◽  
Fasihuddin Badruddin Ahmad
Keyword(s):  
Fragmentation Pattern ◽  
Hexadecanoic Acid ◽  
Mass Spectral Fragmentation ◽  
Mass Spectral ◽  
Decanedioic Acid ◽  
Percentage Yield ◽  
Leaf Oil ◽  
Elephantopus Scaber ◽  
Leaves And Roots ◽  
Mass Spectral Fragmentation Pattern

The oil from stems, leaves and roots of Elephantopus scaber Linn. were extracted by solvent macerationtechnique. The percentage yield oil from stems, leaves and roots are 0.001%, 0.003% and 0.04%, respectively.The stem oil gives major constituents of pentacosane (12.3%), lupenyl acetate (11.7%) and fern-7-en-3β-ol(11.0%), while the leaf oil contains isooctyl phthalate (19.2%), hexadecanoic acid (15.0%) and α-linolenic acid(5.0%) as the major components. The major constituents identified in the root oil are hemellitol (11.6%), octylphthalate (6.0%), 1-nonadecanol (5.6%) and 1-octadecanol (5.5%). There were only three compounds detectedand identified in all three parts of the plant, namely decanedioic acid, bis-(2-ethylhexyl)ester, dotriacontane andpentacosane. The oils were analysed by gas chromatography-mass spectrometer and the compounds wereidentified by comparison with the mass spectral fragmentation pattern database.

scholarly journals Mass Spectral Fragmentation Pattern of Ν,N′ -Diphenylformamidines

1977 ◽  
Vol 32 (10) ◽  
pp. 1156-1159 ◽  
Author(s):  
Neil G. Keats ◽  
Jean E. Rockley ◽  
Lindsay A. Summers
Keyword(s):  
Mass Spectra ◽  
Molecular Ions ◽  
Fragmentation Pattern ◽  
Mass Spectral Fragmentation ◽  
Mass Spectral ◽  
Hydrogen Migration ◽  
Mass Spectral Fragmentation Pattern

The base peaks in the mass spectra of Ν,N′-diphenylformamidine, N,N′-di-(4-chlorophenyl)formamidine and N,N′-di-(3-chlorophenyl)formamidine are due to the molecular ions of aniline, 4-chloroaniline and 3-chloroaniline respectively. The species responsible for the base peaks are thought to be formed by rupture of the CH-NH bond with concomitant hydrogen migration.

Über die Darstellung von P-Chlor-substituierten Ν,N′-Dimethylharnstoff-verbrückten Diphosphorverbindungen, deren Enthalogenierung mit Oxalsäurebis(trimethylsilylester) und anschließende Oxidation mit Tetrachlororthobenzochinon / Preparation of P-Chloro-Substituted N′,N′-Dimethylurea-Bridged Diphosphorus Compounds, their Dehalogenation with Oxalic Acid Bis(trimethylsilyl) Ester and Subsequent Oxidation with Tetrachloroobenzoquinone

1989 ◽  
Vol 44 (6) ◽  
pp. 690-698 ◽  
Author(s):  
Roland Vogt ◽  
Reinhard Schmutzler
Keyword(s):  
Oxalic Acid ◽  
Nmr Spectra ◽  
Quantitative Yield ◽  
Fragmentation Pattern ◽  
Analogous Reaction ◽  
Trimethylsilyl Ester ◽  
Mass Spectral Fragmentation ◽  
Mass Spectral ◽  
Mass Spectral Fragmentation Pattern

Reaction of N,N′-dimethyl-N,N′-bis(trimethylsilyl)urea (1) with dichlorophosphines. RPCl2 (R = Et: 14; R = Pr: 15) has furnished the P-chloro-substituted acyclic diphosphorus compounds, 16 and 17. In the analogous reaction of 1 with Ph2PCl the corresponding bis(diphenylphosphino)-substituted derivative, 21 was formed. Dehalogenation of 11, 16 and 17 with oxalic acid bis(trimethylsilyl) ester, 22 has produced the mixed-valent cyclic λ3P,λ4P-diphosphorus compounds, 23-25 in almost quantitative yield. Oxidation of the λ3P atom in 23-25 with tetrachloroorthobenzoquinone, 26 has given rise to partial cleavage of the P-P bond, and only moderate yields of the products, 29, 31 and 32, have been obtained. The characterization of the various compounds obtained rests, especially, on their 1H and 31P NMR spectra, and on a study of their mass spectral fragmentation pattern

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