Synthesis of cyclophanetetrayne complexes from bis(propargyldicobalt) dication equivalentsElectronic supplementary information (ESI) available: experimental conditions and new compounds. See http://www.rsc.org/suppdata/cc/b2/b203187f/

Abstract

Nicholas reactions of the p-phenyl linked bis(propargyl acetate) complex (3a) with electron rich arenes give cyclophanetetrayne complexes (5). The use of bis(propargyl ether) complex (8) with (3a) allows formation of a mixed cyclophanetetrayne complex (9), and in addition gives retro-Nicholas/intramolecular Nicholas reaction product (2).