The lithio derivative generated from (I) reacts with various electrophiles such as (II), (V) or (VI) to give, at low temp., the 2‐substituted products (III) or (IV), whereas at higher temp. the α‐substituted product (VII) is formed.
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ChemInform Abstract: The Lithiation of 1‐(Phenylthiomethyl)benzimidazole and Related Compounds