Deltic acid

Names
Preferred IUPAC name

2,3-Dihydroxycycloprop-2-en-1-one

Other names

* Deltic acid
* Dihydroxycyclopropenone
* Trianglic acid

Identifiers

CAS Number

* 54826-91-4

3D model (JSmol)

* Interactive image

ChemSpider |

* 9854518

PubChem CID

* 11679790

InChI

* InChI=1/C3H2O3/c4-1-2(5)3(1)6/h4-5H

Key: SPXGBDTUWODGLI-UHFFFAOYAW

SMILES

* O=C1C(O)=C1O

Properties

Chemical formula

| H

Molar mass | 86.046 g·mol−1
Appearance  | White solid

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Deltic acid (also known as dihydroxycyclopropenone or trianglic acid) is a chemical substance with the chemical formula C
3O(OH)
2. It can be viewed as a ketone and double enol of cyclopropene. At room temperature, it is a stable white solid, soluble in diethyl ether, that decomposes (sometimes explosively) between 140 °C and 180 °C, and reacts slowly with water.[1]

## Contents

* 1 Derivatives
* 1.1 Deltate and salts
* 1.2 Analogs
* 2 Synthesis
* 3 See also
* 4 References

## Derivatives

### Deltate and salts

Deltic acid is considered an acid because it is a particularly acidic enediol, with hydroxyl groups relatively easily losing their protons (pKa1 = 2.57, pKa2 = 6.03), leaving behind the symmetric deltate anion, C
3O2−

The first deltate salts (of lithium and potassium) were described in 1976, also by Eggerding and West. Lithium deltate Li

3 is a water-soluble white solid.[1] Like the other cyclic dianions with formula (CO)2−n, the deltate anion has a pronounced aromatic character which contributes to its relative stability.[1]

### Analogs

An analog of the deltate anion can be obtained by replacing the three oxygen atoms (=O or –O−
) by cyanoimino groups (=N–C≡N or –N=C=N−
) to yield the symmetric anion C
3(NCN)2−
3.[2] Replacement of the three oxygen atoms by dicyanomethylene (=C(CN)
2) provides an oxidizing species that is readily reduced to a stable radical anion and dianion.[3]

## Synthesis

Deltic acid was originally obtained by photolysis of the ester bis(trimethylsilyl) squarate, which converted into bis(trimethylsilyl) derivative. Upon irradiation with UV light, the disilyl compound decarbonylates. Decomposition of the latter by butanol yielded deltic acid.[4]

The acid can also be prepared by reaction of silver squarate and trimethylsilyl chloride.[1][5]

The deltate anion has also been obtained by direct cyclotrimerization of carbon monoxide at ambient conditions. Carbon monoxide dissolved in pentane reacted with a uranium coordination compound yielding a deltate anion bound to two uranium atoms.[6]

## See also

* Acetylenediol (H
2(CO)
2 or HO–C≡C–OH)
* Squaric acid (H
2(CO)

* Croconic acid (H
2(CO)

* Rhodizonic acid (H
2(CO)

* Cyclopropenone (C

2O)

## References

1. ↑ 1.0 1.1 1.2 1.3 Eggerding, David; West, Robert (1976). "Synthesis and properties of deltic acid (dihydroxycyclopropenone) and the deltate ion". Journal of the American Chemical Society 98 (12): 3641–3644. doi:10.1021/ja00428a043.
2. ↑ Beck, Johannes; Krieger-Beck, Petra (2006). "Crystal structure of 1,2-bis(cyanoimino)-3-triethylammonio-cyclopropenylide". Analytical Sciences 22: x239. doi:10.2116/analscix.22.x239.
3. ↑ Fukunaga, T. (1976). "Negatively substituted trimethylenecyclopropane dianions". Journal of the American Chemical Society 98 (2): 610–611. doi:10.1021/ja00418a050.
4. ↑ Eggerding, David; West, Robert (1975). "Synthesis of dihydroxycyclopropenone (deltic acid)". Journal of the American Chemical Society 97 (1): 207–208. doi:10.1021/ja00834a047.
5. ↑ Reetz, M. T.; Neumeier, G.; Kaschube, M. (1975). "Thermische Umlagerung von Quadratsäure-Bis(trimethylsilyl)ester". Tetrahedron Letters 16 (15): 1295. doi:10.1016/S0040-4039(00)72653-0.
6. ↑ Summerscales, O. T.; Cloke, F. G. N.; Hitchcock, P. B.; N. Hazari, J. C. Green (2006). "Reductive cyclotrimerization of carbon monoxide to the deltate dianion by an organometallic uranium complex". Science 311 (5762): 829–831. doi:10.1126/science.1121784. PMID 16469921. Bibcode: 2006Sci...311..829S.

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*[CID]: Compound ID