Tellurophenes tabulation

The H NMR spectra of selenophenes and tellurophenes clearly reveal 77Se and 125Te satellite splittings. The magnitude of the heteroatom-proton splittings is tabulated in Table 4. 

Lithiated selenophenes and tellurophenes have been used as intermediates in the preparation of a wide range of derivatives. A comprehensive tabulation of these transformations is available (790R(26)l) and this illustrates the large number of electrophiles which have been reacted with selenienyl- and, to a lesser extent, tellurienyl-lithiums. An extension of the synthetic potential of these lithiated derivatives is achieved by first converting them into iodonium salts (111), which may then be reacted with nucleophiles (Scheme 12) (74SC63). 

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