We recently described2 a new p-terphenyl synthesis that proceeds according to the sequence in Scheme I. The reaction exhibits several interesting features pertinent to the present work:(a) 4 equiv of aryl Grignard are required per mole of 1-2 are used in exchange reactions to form monoGrignard 2 and diGrignard 3, and 2 furnish the “outside” aryl rings of the product 6;(b) novel organometallic arynes such as 4 are intermediates;(c) nucleophilic ...
