Mass spectrometric indication of double bond position in dodecenals without any chemical derivatization

1988 ◽  
Vol 17 (4) ◽  
pp. 301-306 ◽  
Author(s):  
Michio Horiike ◽  
Chisato Hirano
Keyword(s):  
Double Bond ◽  
Double Bond Position ◽  
Mass Spectrometric ◽  
Chemical Derivatization

Mass spectrometric location of double-bond position in isomeric dodecenols, without chemical derivatization

1993 ◽  
Vol 7 (7) ◽  
pp. 591-593 ◽  
Author(s):  
Gu Yuan ◽  
Meiyu He ◽  
Xiaoran He ◽  
Michio Horiike ◽  
Chul-Sa Kim ◽  
...  
Keyword(s):  
Double Bond ◽  
Double Bond Position ◽  
Mass Spectrometric ◽  
Chemical Derivatization

Structural preferences for the double bond position in some unsaturated 3,3-diphenylpyrrolidines

1970 ◽  
Vol 48 (23) ◽  
pp. 3742-3745 ◽  
Author(s):  
M. M. A. Hassan ◽  
A. F. Casy
Keyword(s):  
Double Bond ◽  
Methyl Iodide ◽  
Quaternary Salt ◽  
Double Bond Position ◽  
Magnesium Bromide ◽  
Free Base ◽  
Spectroscopic Evidence ◽  
Structural Preferences ◽  
Ethyl Magnesium Bromide ◽  
Sole Product

The reaction between 3,3-diphenyl-3-cyano-1-methylpropyl isocyanate and ethyl magnesium bromide leads to 2-ethyl-5-methyl-3,3-diphenyl-1-pyrroline rather than the isomeric 2-ethylidenepyrrolidine. The protonated N-methyl analogue (identical with a major metabolite of methadone) retains the 1-pyrroline structure, but the free base is a cis-trans mixture of the corresponding 2-ethylidenepyrrolidines; the cis Me/Ph isomer preponderates and is the sole product (obtained as a quaternary salt) when the mixture is treated with methyl iodide. 5-Methyl-2-methylene-3,3-diphenylpyrrolidine, a lower homologue of the methadone metabolite, isomerizes to a 1-pyrroline derivative when protonated or methylated. All structural conclusions are based on i.r. and p.m.r. spectroscopic evidence.

scholarly journals Interplay of Unsaturated Phospholipids and Cholesterol in Membranes: Effect of the Double-Bond Position

2008 ◽  
Vol 95 (7) ◽  
pp. 3295-3305 ◽  
Author(s):  
Hector Martinez-Seara ◽  
Tomasz Róg ◽  
Marta Pasenkiewicz-Gierula ◽  
Ilpo Vattulainen ◽  
Mikko Karttunen ◽  
...  
Keyword(s):  
Double Bond ◽  
Double Bond Position
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