Metastable transitions in the mass spectra of methyl and phenylthiohydantoin derivatives of amino acids

1972 ◽  
Vol 6 (1) ◽  
pp. 39-45 ◽  
Author(s):  
T. Sun ◽  
R. E. Lovins
Keyword(s):  
Amino Acids ◽  
Mass Spectra ◽  
Derivatives Of

The negative ion mass spectra of (M – H)– ions from phenylthiohydantoin derivatives of amino acids

1995 ◽  
Vol 1 (1) ◽  
pp. 381 ◽  
Author(s):  
Steven Ramsay ◽  
Russell Waugh ◽  
Thomas Blumenthal ◽  
John Bowie
Keyword(s):  
Amino Acids ◽  
Mass Spectra ◽  
Negative Ion ◽  
Derivatives Of

Inductive effect in EI-mass spectra of some 5,6-dihalogenides and 5,6-halohydrins of 5α-cholestan-3β-ol and 3β-acetoxy-5α-cholestane

1982 ◽  
Vol 47 (11) ◽  
pp. 2946-2960 ◽  
Author(s):  
Antonín Trka ◽  
Alexander Kasal
Keyword(s):  
Mass Spectra ◽  
Inductive Effect ◽  
Molecular Ions ◽  
Hydroxyl Group ◽  
Halogen Atoms ◽  
Derivatives Of

Partial EI-mass spectra of 3β-hydroxy- and 3β-acetoxy-5α-cholestanes substituted in positions 5α-, 6β- or 5α,6β- with a hydroxyl group or halogen atoms (fluorine, chlorine, bromine) are presented. The molecular ions of 5α,6β-disubstituted derivatives of 3β-hydroxy-5α-cholestane (or of its 3-acetate) are considerably more stable than the corresponding monosubstituted derivatives if at least one of the pair of the vicinal substituents is chlorine or fluorine. This increase in stability, most striking in 5α- and 6β-fluoro compounds, is explained by the inductive effect.

Derivatives of aminoquinones with N-protected amino acids

1998 ◽  
Vol 5 (4) ◽  
pp. 259-262 ◽  
Author(s):  
Chrysostomos Pachatouridis ◽  
Elias A. Couladouros ◽  
Vassilios P. Papageorgiou ◽  
Maria Liakopoulou-Kyriakides
Keyword(s):  
Amino Acids ◽  
Derivatives Of

Pentacarbonyl complexes of tungsten with derivatives of amino acids

1984 ◽  
Vol 33 (7) ◽  
pp. 1539-1539
Author(s):  
A. A. Ioganson ◽  
Yu. G. Kovalev ◽  
L. L. Milovanova
Keyword(s):  
Amino Acids ◽  
Derivatives Of
Sign in / Sign up

Export Citation Format

Share Document