A pulsed ionization high-pressure mass spectrometric study of methyl cation transfer and methyl cation-induced clustering in dimethyl ether-acetone mixtures

A newly constructed pulsed ionization high-pressure mass spectrometer has been used to examine the methyl cation transfer equilibria between the methylated adducts of acetone and dimethyl ether and the parent compounds. The data indicate that dimethyl ether is a stronger base toward CH + 3 than is a...

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Bibliographic Details
Published in:International journal of mass spectrometry and ion processes 1988-04, Vol.83 (1), p.147-161
Main Authors: Szulejko, J.E., Fisher, J.J., McMahon, T.B., Wronka, J.
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Mass spectrometry
Organic chemistry
Reactivity and mechanisms
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Summary:A newly constructed pulsed ionization high-pressure mass spectrometer has been used to examine the methyl cation transfer equilibria between the methylated adducts of acetone and dimethyl ether and the parent compounds. The data indicate that dimethyl ether is a stronger base toward CH + 3 than is acetone, a reversal from the proton affinity order. Clustering equilibria of (CH 3) 2COCH + 3 with the acetone and dimethyl ether have also been examined. The thermochemical data obtained show that the adducts are covalently bound species with considerable restriction of internal rotations. New thermochemical data for Δ H o f and S o for all species observed are reported.
ISSN:0168-1176
1873-2801
DOI:10.1016/0168-1176(88)80092-2