New types of products obtained by combining two dinuclear multiply metal-metal bonded species (doublets) to obtain cyclic tetranuclear products (quartets) are reported. One new type consists of pairs of quadruply bonded Mo 2 4+ units united by two µ-X links (X ) H, OH, O) although in the last case oxidation has also occurred so that these are Mo 2 5+ moieties. In these cases, the subunits are Mo 2 (DArF) 3 . The second new type consists of Mo 2 (DArF) 2 subunits linked by four µ-X bridges, where X ) Cl, Br, I. The previously known compound Mo 4 I 8 (PBu n 3 ) 4 has been shown to differ from all previously known Mo 4 X 8 (PR 3 ) 4 molecules (X ) Cl, Br) by retaining two quadruple bonds instead of being a metallacyclobutadiyne, as are the others.
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