For nearly a century, chemistry textbooks have described the inductive effect as a force that gradually weakens as it travels through a chain of atoms, typically fading after three or four bonds. New research, however, suggests that in neutral molecules this effect actually stops after just one bond. The work challenges a foundational concept that students and chemists have relied on to predict molecular behavior.
The researchers found no evidence of the inductive effect extending beyond the immediate bond in neutral systems. This contrasts sharply with the traditional model, which assumes a diminishing influence over several bonds. The discrepancy may have gone unnoticed because many experimental results were interpreted through the old framework, masking the true range of the effect.
If confirmed, the correction would simplify how the inductive effect is taught, but it also raises questions about other chemical properties that were explained using the longer-range assumption. The authors suggest that textbooks will need to be updated, though they note that the effect may still behave differently in charged molecules, where the original model might hold. The source does not provide details on those charged cases, so the full scope of the revision remains unclear.