A mass spectral study of a series of heterocyclic organoborarnes shows that when the exocyclic group attached to boron is either an amino- or an alkylthio-group then the cyclic borenium ion can have considerable stability.
R. H. Cragg, M. Nazery, J. F. J. Todd and A. F. Weston, J. Chem. Soc., Chem. Commun., 1973, 386a DOI: 10.1039/C3973000386A
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