Quadruple bond Quadruple bond A quadruple bond is a type of chemical bond between two atoms involving eight electrons. This bond is an extension of the more familiar types double bonds and triple bonds. Stable quadruple bonds are most common among the transition metals in the middle of the d-block, such as rhenium, tungsten, molybdenum and chromium. Typically the ligands that support quadruple bonds are π-donors, not π-acceptors. Chromium(II) acetate, Cr("μ"-OCCH)(HO), was the first chemical compound containing a quadruple bond to be synthesized. It was described in 1844 by E. Peligot, although its distinctive bonding was not recognized for more than a
Owned-and-operated television stations in the United States its partnership, in November 1993 (fourteen months before the network debuted), Tribune agreed to a deal to affiliate most of its independent stations with The WB. Despite Tribune's minority stake, the company's stations were not considered to be WB owned-and-operated-stations due to Time Warner's controlling interest in the network. This resulted in The WB having the unusual distinction of being the only broadcast network that did not have O&Os in New York City, Los Angeles and Chicago throughout its existence (the three Tribune-owned WB affiliates in those cities – WPIX, KTLA and WGN-TV, respectively – were "affiliates" of the network