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Ball and stick model of nitroxyl
IUPAC name
Systematic IUPAC name
Oxidanimine[citation needed]
Other names
Hydrogen oxonitrate(I)

Nitronous oxide

Nitrosyl hydride
ChEMBL ChEMBL1200689 YesY
ChemSpider 920 YesY
Jmol-3D images Image
MeSH Nitroxyl
PubChem 945
Molar mass 31.01 g·mol−1
log P 0.74
33.88 J K−1 mol−1
220.91 J K−1 mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Nitroxyl (common name) or azanone (IUPAC name)[1] is the chemical compound HNO. It is well known in the gas phase.[2] In aqueous solution it acts as an acid with the conjugate base NO, (pKa = 11.4).[3] NO is the reduced form of nitric oxide (NO) and is isoelectronic with dioxygen. Nitroxyl can be formed as a reaction intermediate.
Nitroxyl is very reactive towards nucleophiles (especially thiols) and quickly dimerizes to hyponitrous acid, H2N2O2, which is then dehydrated to nitrous oxide N2O. Therefore, HNO is generally prepared in situ for example with the compounds such as Angeli’s salt (Na2N2O3) and Piloty’s acid (PhSO2NHOH) when it is needed.

Nitroxyl donors, known as nitroso compounds, show potential in the treatment of heart failure and ongoing research is focused on finding new molecules for this task. In one study [4] such donor is prepared by organic oxidation of cyclohexanone oxime with lead tetraacetate to form 1-nitrosocyclohexyl acetate:

Nitrosocyclohexyl acetate

This compound can be hydrolyzed under basic conditions in a phosphate buffer to HNO, acetic acid and cyclohexanone.

Other studies that have been conducted on HNO precursors include those from Nagasawa et al.[5] in which Piloty's acid is derivatized and produces HNO upon thermal decomposition. Other notable studies on the production of HNO come from Toscano et al.[6] in which cycloadducts of acyl nitroso species (which are known to decompose via hydrolysis to HNO and acyl acid) are synthesized. Upon photolysis these compounds release the acyl nitroso species which then further decomposes.


  1. ^ Nitroxyl (azanone) trapping by metalloporphyrinsDoctorovich, F., Bikiel, D., Pellegrino, J., Suárez, S.A., Larsen, A., Martí, M.A.2011Coordination Chemistry Reviews255(23–24), pp. 2764–2784
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419. 
  3. ^ Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5
  4. ^ Hydrolysis of Acyloxy Nitroso Compounds Yields Nitroxyl (HNO) Xin Sha, T. Scott Isbell, Rakesh P. Patel, Cynthia S. Day, and S. Bruce King J. Am. Chem. Soc.; 2006; 128(30) pp 9687 - 9692; (Article) doi: 10.1021/ja062365a
  5. ^ Prodrugs of Nitroxyl as Potential Aldehyde Dehydrogenase Inhibitors vis-a-vis Vascular Smooth Muscle Relaxants Nagasawa, H. T.; Kawle, S. P.; Elberling, J. A.; DeMaster, E. G.; Fukuto, J. M. J. Med. Chem., 38, 1865-1871. doi:10.1021/jm00011a005
  6. ^ Cohen, A. D.; Zeng, B.-B.; King, S. B.; Toscano, J. P. J. Am. Chem. Soc. 2003, 125, 1444-1445.doi:10.1021/ja028978e

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Nitroxyl — Please support Wikipedia.
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27 news items

PR Newswire (press release)
Wed, 18 Sep 2013 11:43:26 -0700

18, 2013 /PRNewswire-iReach/ -- Nitro Solution, a website that offers high quality and all-natural nitric oxide supplements, has just launched its brand new and user-friendly site. In addition to featuring the safe and innovative supplement called ...


Thu, 19 Mar 2015 06:18:45 -0700

Wang and Groves began by oxidizing APO using mCPBA, and then determined that the reduction of APO-I using a nitroxyl radical would provide APO-II. They tested their nitroxyl radical candidates using a model system, ensuring that they would get complete ...


Wed, 15 Jul 2015 17:45:00 -0700

A team of chemists from the University of Wisconsin-Madison has introduced a new fuel cell catalyst approach that uses a molecular catalyst system instead of solid catalysts. Credit: Stahl Group/University of Wisconsin-Madison. In the quest for better ...

DocCheck News

DocCheck News
Wed, 16 Jul 2014 06:18:45 -0700

Bessere Durchblutung, ein niedriger Blutdruck und ein kräftiges Herz – diese Effekte wiesen Wissenschaftler nun bei der Erforschung des bisher wenig beachteten Wirkstoffes Nitroxyl nach. Gleichzeitig zeigten sie dessen Grenzen auf: Nitroxyl kann auch ...

Jewish Business News

Jewish Business News
Sun, 15 Mar 2015 09:52:30 -0700

Technion scientists have developed the alpha hydrogen nitroxyl radical – a new stable class of chemical that encourages other chemicals to react together without being affected itself. This has major implications for chemical and medical industries ...
Mon, 28 Jul 2014 05:22:30 -0700

About CXL-1427CXL-1427 is a novel, improved second-generation prodrug that breaks down chemically to produce nitroxyl (HNO) and an inactive byproduct following intravenous administration. In extensive pre-clinical testing and in a Phase IIa human ...
UC Los Angeles
Fri, 28 Feb 2014 10:39:52 -0800

Both work synergistically to catalyze the production of nitroxyl, which can be used inside the blood like nitric oxide, although it contains one less electron. Nitroxyl has been reported as being analogous to nitric oxide in its clot-preventing ...
Chemistry World
Tue, 16 Dec 2008 00:00:00 -0800

Adding the nitroxyl radicals does not affect the drug's movement through the blood-brain barrier, which is a crucial step for the drug, explains Bakalova. 'We observed that the drug was localised in the brain tissue and were able to map the drug ...

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