Go toArchive
Browse byFacets
Bookbag ( 0 )
'Pyrazaboles' in keywords Facet   section ZfN Section B  [X]
Results  2 Items
Sorted by   
Publication Year
1978 (1)
1976 (1)
1Author    C. E. May, K. Niedenzu, S. TrofimenkoRequires cookie*
 Title    Spectroscopic Studies on Pyrazaboles  
 Abstract    The mass spectra of several pyrazaboles of type 1 where R and'or R' = C2H5 have been studied. The loss of boron-bonded hydrocarbon moieties under electron impact is the predominant feature of all spectra. Some ultraviolet and nuclear magnetic resonance data on compounds of type 1 have been collected; bulky substituents were observed to lead to conformational isomers that can be detected by 13 C NMR spectroscopy. 
  Reference    Z. Naturforsch. 33b, 220—223 (1978); received October 11 1977 
  Published    1978 
  Keywords    Pyrazaboles, Dimeric Aminoboranes, Boron Compounds, Mass Spectra, NMR 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0220.pdf 
 Identifier    ZNB-1978-33b-0220 
 Volume    33 
2Author    S. TrofimenkoRequires cookie*
 Abstract    The mass spectra of several pyrazaboles of type 1 (R = H) have been studied. The data illustrate that electron impact causes three major fragmentation patterns for the species. Symmetrical cleavage of the pyrazabole followed by further breakdown is common to all compounds. In addition, those pyrazaboles containing H or CH3 at the C atoms of the pyrazole rings undergo an electron impact-induced rearrangement which appears to result in the formation of a species containing a B2N3 ring as a structural entity; subsequent breakdown leads to a B2N2 ring system. The mass spectra of halo-or pseudohalo-substi-tuted pyrazaboles evidence the ready loss of hydrogen halide as a predominant feature; no rearrangement ions are observed. 
  Reference    (Z. Naturforsch. 31b, 1662—1666 [1976]; received September 16 1976) 
  Published    1976 
  Keywords    Pyrazaboles, 1-Pyrazolylboranes, Dimeric Aminoboranes, Mass Spectra, Boron Compounds 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1662.pdf 
 Identifier    ZNB-1976-31b-1662 
 Volume    31