Abstract
Abstract77Se and 125Te chemical shifts have been measured for o‐halogenated seleno‐ and telluro‐phenetoles. Correlations exist between these parameters and the halogen electronegativities or the 13C chemical shifts, except for the fluorine derivatives. The chalcogen shifts are related to the shifts of various nuclei in halobenzene derivatives, namely 1H in benzenes, 13C in toluenes, 15N in anilines and 19F in fluorobenzenes. 77Se and 125Te chemical shifts are correlated in the o‐halogenated seleno‐ and telluro‐phenetoles and in chalcogen analogues of o‐methoxy‐selenoanisole and ‐tellurophenetole: Δδ(Te) = 1.60Δδ(Se). The observed gradient is close to values previously reported for other selenides and tellurides, but differs from the value observed in heterocycles. This observation is discussed.
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