Gas-phase SN2 reactivity of dicoordinated borinium cations using pentaquadrupole mass spectrometry



We report gas phase ion/molecule reactions between dialkoxyborinium cations (RO−B+ −OR) and small organic amides, such as N,N-dimethylformamide and N,N-diethylpropionamide. Besides direct addition at boron, the results show efficient SN2 methyl transfer from the borinium ion to the amide. Isotopic labeling and collision-induced dissociation (CID) of the methyl transfer products demonstrate O-methylation of the amide. Methyl substitution at the α-carbon of the amide affects the degree of alkylation and adduct formation. Direct proton abstraction via β-elimination is a major competitive reaction for substituents other than methyl. Ab initio calculations at the B3LYP/6-31G(d) level indicate that SN2 transmethylation is highly exothermic with O-methylation favored over N-methylation by 14.8 kcal/mol.


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Copyright information

© American Society for Mass Spectrometry 2001

Authors and Affiliations

  1. 1.Department of ChemistryPurdue UniversityWest LafayetteUSA

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