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Formation of a Stable ‘Proton-bridged Dimer’ by Decomposition ofCH3CH(OC2H5)CH(OC2H5)CH3+• in a Mass Spectrometer

✍ Scribed by Milliet, Arielle; Rempp, Muriel; Sozzi, Georges

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
509 KB
Volume
31
Category
Article
ISSN
1076-5174

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✦ Synopsis

A stable ethanal...H+...ethanol proton-bridged dimer (2) by decomposition of CH,CH(OC,H,)CH(OC,H,)CH~ ' was formed in the ion source of a Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer and also in the second field-free region of a reverse-geometry mass spectrometer. Its structure was established with collisional activation and FT-ICR spectra. The formation of this ion is preceded by extensive hydrogen exchanges and carbon rearrangement. These exchanges are the result of reversible isomerizations between a series of ion-neutral complexes and hydrogen-and proton-bonded dimers. FT-ICR experiments reveal a selective substitution of ethanal by C,D,OH in the proton-bridged dimer 2.

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Secondary isotope effects in the mass spectra of C2D5OC2H5 and CD3CH2OC2H5
✍ Morley E. Russell 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 248 KB

Secondary isotope effects were examined in the loss of methyl from the molecular ions of C,D,OC,H, and CD,CH,OC,H, for ion source processes and collisional activation (CA) processes. In the ion source loss of CH, was slightly favored over loss of CD, , but in CA the CH, loss was favored to a much la