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Oxatriquinane.svg Oxatriquinane.png
CAS number 1056549-35-9 YesY
Jmol-3D images Image 1
Molecular formula C9H15O
Molar mass 139.21 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Oxatriquinane is an alkyl oxonium ion with formula C
, remarkable for being stable in aqueous solution. It has a cyclononane backbone, with the trivalent oxygen connected to carbons 1,4, and 7, forming three fused pentagonal cycles.

Oxonium ions normally are strong alkylating agents and are only observed in solution as reactive intermediates or under extreme conditions. Oxatriquinane does not react with boiling water or with alcohols, thiols, halide ions, or amines, although it does react with stronger nucleophiles such as hydroxide, cyanide, and azide.[1] It also had the longest C−O bond and more acute C−O−C angles yet seen in oxonium compounds.[1]

Oxatriquinane was first described in 2008, and was obtained after a five-step synthesis starting from cyclononatriene.[1][2][3] The same paper also described oxatriquinacene, the tri-unsaturated analog, which is of interest as a possible precursor to oxaacepentalene, a neutral aromatic species.

A methylated derivative, 1,4,7-trimethyloxatriquinane, was described in the same year. It is stable in solution in methanol, chloroform, and under refluxing in ethanol, and was crystallized as the PF


  1. ^ a b c Mark Mascal, Nema Hafezi, Nabin K. Meher, and James C. Fettinger (2008). "Oxatriquinane and Oxatriquinacene: Extraordinary Oxonium Ions". Journal of the American Chemical Society 130 (41): 13532–13533. doi:10.1021/ja805686u. PMID 18798616. 
  2. ^ Rachel Petkewich (September 29, 2008). "Taming Alkyl Oxonium Ions: Fused tricyclic structure stabilizes famously reactive alkylating agents". Chemical and Engineering News 86 (39): 10. doi:10.1021/cen-v086n039.p010. 
  3. ^ Tim Reid (3 October 2008). "Oxonium ions: Ring of stability". Nature Chemistry. doi:10.1038/nchem.70. 
  4. ^ Mark Mascal, Nema Hafezi, and Michael D. Toney (2008), "1,4,7-trimethyloxatriquinane: SN2 reaction at tertiary carbon." Journal of the American Chemical Society, volume 132, pages 10662–10664. doi:10.1021/ja103880c