Gas-Phase Reaction of Acetaldehyde with Silicon-Containing Ions

Abstract

CH2=Si(CH3)OSi(CH3)2+ ions 1 were formed in the external source of a Fourier-transform ion cyclotron resonance (FT-ICR)mass spectrometer by fragmentation of (CH)3SiOSi(CH3)3. In the cell, their reactions with acetaldehyde were studied by using labeled reactants and compared with those with acetone, studied in previous work, which gives a general view of the reactions of ion 1 with carbonyl compounds. In contrast with the behavior of the corresponding carbon-containing ions, the results confirm facile 1,3-methyl group transfers from silicon to silicon. Otherwise, the silicon-containing adducts often eliminate C nH2 n. This process, not observed in (C,O,H)-containing ions, is studied by using selectively deuterated reactants.

9 Organic gas phase ion chemistry

“…Pyridine reacts with β-silyl cations via either proton or trimethylsilyl abstraction [eqns. ( 45), ( 46 ϩ towards acetaldehyde 202 and of the ethylsilylium cation towards ethylene 203 have also been studied.…”