Hydrogen shifts, mass spectrometry

It has been shown by mass spectrometry that the deuteration of C60 leads to products richer in deuterium content in comparison to the hydrogenation which instead leads almost exclusively to C60H36 (Taylor 1999 Darwish et al. 1995). However, the spectra in Fig. 7.3 show that C60H36 and its deuterated analogous display the same band pattern apart the discussed isotopic shift and hence it is reasonable to state that C60D36 has been obtained and studied. This observation has been made also by other authors who have used also Raman in addition to FT-IR spectroscopy (Meletov et al 2001). 

Gas chromatography-mass spectrometry analysis of the dimer and trimer fractions of the polymerisation products of propene and but-l-ene also suggested intramolecular hydride and methanide shifts as the source of the isomers formed. A mechanistic scheme for the oligomerisation of propene has been proposed, Reaction sequence (2.4) [31]. In most of the studies described above, the products have been analysed after hydrogenation. However, a study analysed the Cy product of a propene/but-l-ene copolymerisation before hydrogenation and confirmed the role of hydride and methanide shifts in determining the structures of the products [32],... 

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