ChemInform Abstract: EXCITATION FUNCTIONS OF SLOW PROTON TRANSFER REACTIONS INVOLVING NEGATIVE IONS

1978 ◽  
Vol 9 (30) ◽  
Author(s):  
C. LIFSHITZ ◽  
R. L. C. WU ◽  
T. O. TIERNAN
Keyword(s):  
Proton Transfer ◽  
Negative Ions ◽  
Transfer Reactions ◽  
Excitation Functions ◽  
Proton Transfer Reactions

Collision-Induced Dissociations of Negative-Ions Formed by Reaction of HO- With Alkyl and Aryl Silanes. The Formation of Multiple Bonds to Silicon

1988 ◽  
Vol 41 (1) ◽  
pp. 57 ◽  
Author(s):  
RA Ohair ◽  
JH Bowie ◽  
GJ Currie
Keyword(s):  
Proton Transfer ◽  
Ab Initio Calculations ◽  
Collisional Activation ◽  
Multiple Bond ◽  
Negative Ions ◽  
Transfer Reactions ◽  
Multiple Bonds ◽  
Common Features ◽  
Proton Transfer Reactions ◽  
Bond Character

Collisional activation of alkyl and aryl siloxide ions produces a variety of ions and neutrals containing double bonds to silicon. Sila enolate ions and sila acyl ions RSi =O are common features of the spectra of alkylsiloxide ions; ab initio calculations suggest these ions to have considerable multiple bond character. It is proposed that most reactions proceed through ion complex intermediates. Specific proton transfer reactions often occur for ions Me3SiCHR (R = C3H5, C3H3 or Ph), i.e. Me3SiCHR → -CH2(Me)2SiCH2R. In the particular case of the formation of PhCH2- from Me3SiCHPh, i.e. Me3SiCHPh → -CH2(Me)2SiCH2Ph → PhCH2- +Me2Si=CH2, the proton transfer competes with scrambling of all hydrogens in the decomposing ion.

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