Organic Mass Spectrometry p. 270 - 276 (1992)
Update date:2022-07-29
Topics:
Stringer, Michael B.
Underwood, Dennis J.
Bowie, John H.
Allison, Colin E.
Donchi, Kevin F.
Derrick, Peter J.
Intramolecular 13C and 2H isotope effects have been measured for unimolecular losses of ethene (the McLafferty rearrangement) from metastable molecular ions of 2-ethyl-1-phenylbutan-1-one, 3-ethylpentan-2-one and heptan-4-one.Primary and secondary deuterium isotope effects are observed at the γ-(terminal) and β-positions, respectively.Large primary 13C isotope effects occur at β-positions and for the γ positions of 3-ethylpentan-2-one and heptan-4-one.The carbon isotope effects in the cases of the doubly isotopically labelled CH3COCH(C2H5)((13)CH2CH3) and CD3COCD(C2D5)((13)CD2CD3) are 1.17 (+/-0.01) and 1.04 (+/-0.01), respectively.All of these isotope effects are consistent with a stepwise mechanism in which more than one step is rate determining.
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