Substituent effects on long range proton–proton couplings in 4‐substituted bornanones

Abstract
Long range proton–proton coupling constants between H3exo and H5exo have been measured in a series of 4‐substituted bornanones. Correlation between the magnitudes of 4J3exo–5exo and the inductive linear free energy σI has been obtained. 4‐Substituted bornanone nitrimines exhibit diminished values of 4J3exo–5exo with respect to the parent ketone.