Abstract The side-chain-ring coupling constants3 in the three isomeric tetrachlorotoluenes are J ortho 0.63±0.02 c/s, J meta 0.36±0.02 c/s, and J para 0.63±0.01 c/s. The magnitudes of side-chain coupling constants in benzene derivatives are discussed. In symmetrical six- membered aromatic and heterocyclic compounds the magnitude of the ortho side-chain coupling constants is approximately 0.6 c/s but varies from less than 0.3 cis to 1.1 c/s in ...
