Additivity of deshielding effects in the 1H N.M.R. spectra of some exo-Triazatricyclo[5,2,1,02,6]decenes and exo-Azatricyclo[3,2,1,02,4]octanes

Abstract

The presence of an endo-chloro substituent at C8 (or C9) of 5-phenyl-exo-3,4,5-triazatricyclo-[5,2,1,02,6]dec-3-enes and at C 6 (or C 7) of 3- phenyl-exo-3-azatricyclo[3,2,1,02,4]octanes causes significant deshielding of the endo-bridgehead protons. The through-space deshielding effect is remarkably additive in cis,endo-dichloro analogues.