ChemInform Abstract: MASS SPECTRAL FRAGMENTATION PATTERN OF 4,4′-BIPYRIDINES. PART II. 4,4′-OXYBISPYRIDINE AND 4,4′-THIOBISPYRIDINE

1981 ◽  
Vol 12 (50) ◽  
Author(s):  
J. E. ROCKLEY ◽  
L. A. SUMMERS
Keyword(s):  
Fragmentation Pattern ◽  
Mass Spectral Fragmentation ◽  
Mass Spectral ◽  
Mass Spectral Fragmentation Pattern

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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