Mass spectra of tetrahydroisoquinoline-fused 1,3,2-O,N,P- and 1,2,3-O,S,N-heterocycles: influence of ring size and fusion, of present heteroatoms, substituent effects and of the stereochemistry on fragmentation

2008 ◽  
Vol 22 (10) ◽  
pp. 1519-1527 ◽  
Author(s):  
Ines Starke ◽  
Ildikó Schuster ◽  
Ferenc Fülöp ◽  
Erich Kleinpeter
Keyword(s):  
Mass Spectra ◽  
Substituent Effects ◽  
Ring Size

Substituent effects in mass spectra of monosubstituted benzils

1975 ◽  
Vol 10 (4) ◽  
pp. 295-312 ◽  
Author(s):  
Kenneth E. Richards ◽  
Blair N. McMaster ◽  
Graeme J. Wright
Keyword(s):  
Mass Spectra ◽  
Substituent Effects

Substituent effects in the mass spectra of diethyl phenyl phosphates

1989 ◽  
Vol 24 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Concetta Kascheres ◽  
Mirtes Sintoni
Keyword(s):  
Mass Spectra ◽  
Substituent Effects

ChemInform Abstract: Ring-Size and Substituent Effects in Intramolecular Reactions of Alkylidenecarbenes (Carbenoids).

ChemInform ◽  
2010 ◽  
Vol 23 (2) ◽  
pp. no-no
Author(s):  
M. S. BAIRD ◽  
A. G. W. BAXTER ◽  
A. HOORFAR ◽  
I. JEFFERIES
Keyword(s):  
Substituent Effects ◽  
Ring Size ◽  
Intramolecular Reactions

ortho-Effects in Mass Spectra. Alteration of the Molecular-Ion Energy Distribution in Disubstituted Acetanilides

1972 ◽  
Vol 27 (4) ◽  
pp. 670-677 ◽  
Author(s):  
Steven Benezra ◽  
Maurice Bursey
Keyword(s):  
Excited State ◽  
Mass Spectra ◽  
Transition Probability ◽  
Substituent Effects ◽  
Quasi Equilibrium ◽  
Ion Energy ◽  
Ion Energy Distribution ◽  
Molecular Ion ◽  
Equilibrium Calculations ◽  
Excitation Probability

Abstract Simplified quasi-equilibrium calculations performed on the mass spectra of dihalosubstituted phenyl acetates and acetanilides again uncover the same substituent effects on the rise of K with E for the loss of ketene from phenyl acetates as was determined for the monosubstituted phenyl acetates. However, a new effect is found for the disubstituted acetanilides, removal of excitation probability for low-lying energy states of the molecular ion. This effect parallels the removal of transition probability for the lowest excited state of the neutral molecule.

Sign in / Sign up

Export Citation Format

Share Document