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The kinetics of quinuclidine displacement of BH3 from a wide range of Lewis base borane adducts have been measured. Parameterization of these rates has enabled the development of a nucleofugality scale (NF, shown to quantify and predict the leaving group ability of a range of other Lewis bases. Additivity observed across a number of series R'3-nRnX (X = P, N; R' = aryl, alkyl) has allowed the formulation of related substituent parameters (nfPB, nfA, providing a means of calculating NFB values for a range of Lewis bases that extends
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