The situation in which reaction parameters that characterize different bond forming or bond breaking processes in the same reaction have developed to different extents as the @[email protected] is approached along some arbitrarily defined @[email protected] For example, in the nitroalkane anomaly, the Brønsted \(\beta \) exponent for @[email protected] removal is smaller than the Brønsted \(\alpha \) for the nitroalkane, because of imbalance between the amount of bond breaking and @[email protected] @[email protected] in the @[email protected] Imbalance is common in reactions such as @[email protected], addition and other complex reactions that involve @[email protected] (@[email protected]) transfer.