The first nine-membered triphosphorus macrocycles based on an o -benzobis(ethane-1,2-diyl) core have been prepared in high yield by the coupling of 1,2-diphosphinobenzene with trivinylphosphine on a cationic (η 5 -pentamethylcylopentadienyl)iron(II) template. Hydrogenation of the vinyl function followed by alkylation of the secondary phosphines gives the coordinated triethyl macrocycle, which has been structurally characterized.
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Edwards et al. (2000) studied this question.
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