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Back to bases: What happens, if three nitrogen lone pairs are forced to interact with each other? An extraordinary increase in basicity. This conclusion is the result of DFT calculations which, for example, predict a pKa value (of the conjugate acid, in acetonitrile) of 30.2 for tris(8-quinolyl)borane 1. The basicity is due to a strongly destabilizing interaction between the three quinoline lone pairs in the free bases.
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Götz Bucher (2003) studied this question.
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