scholarly journals Fragmentation and Reaction Rate Constants of Terpenoids Determined by Proton Transfer Reaction-mass Spectrometry

2013 ◽  
Vol 51 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Akira TANI
Keyword(s):  
Mass Spectrometry ◽  
Proton Transfer ◽  
Rate Constants ◽  
Reaction Rate ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Reaction Mass ◽  
Reaction Rate Constants

Reactions of tert-C4H9+, tert-C5H11+, and CH3-cy-C5H9+ ions with pentenes

1976 ◽  
Vol 54 (19) ◽  
pp. 3050-3055 ◽  
Author(s):  
Guy J. Collin
Keyword(s):  
Proton Transfer ◽  
Rate Constants ◽  
Hydrogen Molecule ◽  
Reaction Rate ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Unsaturated Hydrocarbons ◽  
Total Reaction ◽  
Reaction Rate Constants ◽  
Isomerization Mechanism

Total reaction rate constants for the disappearance of tert-C4H9+ ions with five C5H10 unsaturated hydrocarbons were determined by comparing the rate of formation of isobutane in the radiolysis of neopentane in the presence of various additives. These rate constants are of the order of 5 to 1.35 × 10−10 cm3 molecule−1 s−1 depending upon the olefin under investigation. The hydride transfer reaction from 3-methyl-1-butene and trans-2-pentene toward the tert-C4H9+ ion was also observed, as was the proton transfer reaction from the tert-C4H9+ ion toward 2-methyl-2-butene and 2-methyl-1-butene. In the latter two cases, a significant isomerization of methylbutene is noticed: an isomerization mechanism based upon the reactions of tert-C5H11+ ions is tentatively suggested. Finally, the transfer reaction of an hydrogen molecule between the CH3-cy-C5H9+ ion and the methylbutenes is observed during the radiolysis of methylcyclopentane.

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