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1,3,2‐Diazaborinium Compounds — New Cationic Boron Heteroarenes The diazaborinium cation 9 is obtained by the reaction of the vinamidine boron chelate 8 with Et2O—BF3. The cyclic aluminium compound 13 forms with the dichloroboranes RBCl2 (R = Cl, Et, Ph) the cations 15,16a, and 16b. AM1 calculations demonstrate the π interaction of the boron with the nitrogen atoms as well as with the fluoro substituent.
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Kühn et al. (1991) studied this question.
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