Mass spectrum of tetrabutyltin

Intramolecular hydrogen transfer in mass spectra. I. Rearrangements in aliphatic hydrocarbons and aromatic compounds

“…at least, deuterium labeling supports this formulation of the reaction as a site-specific 142 It is seen also in reactions of doubly charged ions from Ge2(C2H5)6. 139 In addition to the four-center mechanism proposed, reaction via a five-center transition state has been invoked in special cases such as the loss of C2H4 from (C2Hs)3SnSnH2+.142 Frequently losses of H2 are also observed here from fragments.138 Loss of higher aikenes from larger alkyl groups attached to group IV metals has also been observed (ref 139,141,143,144,146,[148][149][150][151]. Sometimes the olefin lost contains fewer carbons than the alkyl group.138•150 Lead alkyls, in particular, show abundant ions formed by rearrangement of alkyl groups, and in tetra-n-propyllead the MePb+ ion is the most abundant in the spectrum.…”