| Abstract
| - Chemical reduction of [Mo2Cp2(μ-Cl)(μ-PA2)(CO)2] (A = Cy, Ph, OEt) gives the correspondingalkaline metal salts of the triply bonded anions [Mo2Cp2(μ-PA2)(μ-CO)2]-, which exhibit both molybdenumand oxygen nucleophilic sites. The PCy2 anion reactseasily with NH4+, [AuCl(PR3)], or MeI to give unsaturated dicarbonyls [Mo2Cp2(μ-X)(μ-PA2)(CO)2] (X = H,AuPR3, Me), while [Me3O]BF4 gives the methoxycarbyne[Mo2Cp2(μ-COMe)(μ-PCy2)(μ-CO)] and allyl chloride rearranges to give the unsaturated alkenyl complex [Mo2Cp2(μ-PCy2)(μ-CMeCH2)(CO)2].
- The title anion displays comparable O- and Mo-nucleophilic sites, thereby allowing the synthesis of multiply bonded derivatives that are either unusual or not accessible otherwise. The unsaturated nature of the anion can also promote unusual coordination modes or rearrangements in the incoming electrophile.
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