Abstract
The preparation and comprehensive characterization of a series of homoleptic sandwich complexes containing diphosphacyclobutadiene ligands are reported. Compounds [K([18]crown-6)ACHTUNGTRENUNG(thf)2][Fe(η4- P2C2tBu2)2] (K1), [K([18]crown-6)- ACHTUNGTRENUNG(thf)2][Co(h4-P2C2tBu2)2] (K2), and [K([18]crown-6)ACHTUNGTRENUNG(thf)2][Co(η4- P2C2Ad2)2] (K3, Ad=adamantyl) were obtained from reactions of [K([18]crown-6)ACHTUNGTRENUNG(thf)2][M(η4-C14H10)2] (M=Fe, Co) with tBuC P (1, 2), or with AdC P (3). Neutral sandwiches [M(h4-P2C2tBu2)2]
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