title: En route to dinitroacetylene: nitro(trimethylsilyl)acetylene and nitroacetylene harnessed by dicobalt hexacarbonyl.
abstract: Dinitroacetylene and other nitroacetylenes are attractive stoichiometric precursors to high energy-density materials, but suffer from high reactivity and thermal instability. Herein, we report that nitroacetylenes can be dramatically stabilized in the form of their dicobalt hexacarbonyl complexes. In particular, we describe the syntheses and characterization of the first two transition-metal complexes of nitroalkynes, [μ-1-nitro-2-(trimethylsilyl)ethyne-1,2-diyl]bis(tricarbonylcobalt)(Co-Co) and [μ-1-nitroethyne-1,2-diyl]bis(tricarbonylcobalt)(Co-Co). The chemistry of these compounds reveals their potential as reaction partners in [2+2+2] cyclotrimerizations, furnishing nitroindane, nitrotetralin, and trinitrobenzene products. The X-ray crystal structure of 1,3,5-trinitro-2,4,6-tris(trimethylsilyl)benzene presents a distorted, yet planar, aromatic ring.
authors.affiliation: Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720-1460, USA.
authors.forename: G Kenneth
authors.initials: GK
authors.lastname: Windler
authors.forename: Mao-Xi
authors.initials: MX
authors.lastname: Zhang
authors.forename: Robert
authors.initials: R
authors.lastname: Zitterbart
authors.forename: Philip F
authors.initials: PF
authors.lastname: Pagoria
authors.forename: K Peter C
authors.initials: KP
authors.lastname: Vollhardt