Synthese, 31 P‐ und 199 Hg‐NMR‐Spektroskopie der achtgliedrigen Ringverbindung [Hg 2 (μ‐dppm) 2 (DMSO) 4 ] 4 +( − O 3 SCF 3 ) 4

Synthesis, 31 P and 199 Hg NMR Spectroscopy of the Eight‐membered Ring Compound [Hg 2 (μ‐dppm) 2 ] 4+ ( − O 3 SCF 3 ) 4 The cationic eight‐membered metallacyclic title compound 4 (with ring 2 ) has been prepared in high yield by the reaction of [Hg(DMSO) 6 ](O 3 SCF 3 ) 2 with bis(diphenylphosphino)methane (dppm) or [Hg(η 1 ‐dppm) 2 ](O 3 SCF 3 ) 2 . The structure in solution has been characterized using 31 P and 199 Hg NMR spectroscopy. For the first time a metal‐metal spin‐spin coupling in [M 2 (μ‐dppm) 2 ] rings without formal metal‐metal bond is reported ( J ( 199 Hg, 199 Hg) = 699 – Hz depending on the solvent).