Synthesis of Biphenylenes and Their π-Extended Derivatives

Abstract

A series of biphenylenes and their π-extended derivatives are easily prepared through tert-butyllithium-mediated cyclization of suitable halobiaryls and haloteraryls, respectively. The reactions proceed via the corresponding arynyl intermediates at low temperature (up to –20 °C).

Key words

arynes - biphenylenes - organolithiums - [3]phenylenes

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