Lead(IV) acetate: Difference between revisions
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{{Short description|Organometallic compound (Pb(C2H3O2)4)}} |
{{Short description|Organometallic compound (Pb(C2H3O2)4)}} |
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|ImageFile = Lead-tetraacetate-3D-balls.png |
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|IUPACName = Lead(IV) acetate |
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|SystematicName = Tetrakis(acetyloxy)plumbane |
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|OtherNames = Lead tetraacetate<br/>Plumbic acetate |
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|Section1={{Chembox Identifiers |
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|CASNo_Ref = {{cascite|correct|CAS}} |
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|CASNo = 546-67-8 |
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|ChEBI = 77245 |
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| ChemSpiderID = 10608816 |
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|PubChem = 11025 |
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|Section2={{Chembox Properties |
|Section2={{Chembox Properties |
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|Formula = {{chem2|Pb(C2H3O2)4}} |
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|MolarMass = 443.376 g/mol |
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|Appearance = colorless or pink crystals |
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|Odor = vinegar |
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|Density = 2.228 g/cm<sup>3</sup> (17 °C) |
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|MeltingPtC = 175 |
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|BoilingPt = decomposes |
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|Solubility = soluble, reversible hydrolysis |
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|SolubleOther = reacts with [[ethanol]] <br /> soluble in [[chloroform]], [[benzene]], [[nitrobenzene]], hot [[acetic acid]], [[hydrochloric acid|HCl]], [[tetrachloroethane]] |
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|Section3={{Chembox Hazards |
|Section3={{Chembox Hazards |
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| GHS_ref=<ref>{{cite web |title=Substance Information - ECHA |url=https://echa.europa.eu/substance-information/-/substanceinfo/100.008.099 |website=echa.europa.eu}}</ref> |
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| GHSPictograms = {{GHS07}}{{GHS08}}{{GHS09}} |
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| GHSSignalWord = Danger |
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'''Lead(IV) acetate''' or '''lead tetraacetate''' is an [[ |
'''Lead(IV) acetate''' or '''lead tetraacetate''' is an [[metalorganic compound]] with [[chemical formula]] {{chem2|Pb(C2H3O2)4}}. It is a colorless solid that is [[soluble]] in [[nonpolar]], [[organic solvent]]s, indicating that it is not a [[Salt (chemistry)|salt]]. It is degraded by moisture and is typically stored with additional [[acetic acid]]. The compound is used in [[organic synthesis]].<ref>{{cite encyclopedia|author=Mihailo Lj. Mihailović |author2=Živorad Čeković |author3=Brian M. Mathes |encyclopedia=Encyclopedia of Reagents for Organic Synthesis|year=2005|doi=10.1002/047084289X.rl006.pub2|isbn = 978-0-471-93623-7|chapter = Lead(IV) Acetate}}</ref> |
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==Structure== |
==Structure== |
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In the solid state the lead(IV) centers are coordinated by four acetate ions, which are [[denticity|bidentate]], each coordinating via two oxygen atoms. The lead atom is 8 coordinate and the O atoms form a flattened [[snub disphenoid|trigonal dodecahedron]].<ref>{{cite journal |last1=Schürmann |first1=M. |last2=Huber |first2=F. |title=A redetermination of lead(IV) acetate |journal=Acta Crystallographica Section C |volume=50 |issue=11 |year=1994 |pages=1710–1713 |issn=0108-2701 |doi=10.1107/S0108270194006438|doi-access= |
In the solid state the lead(IV) centers are coordinated by four acetate ions, which are [[denticity|bidentate]], each coordinating via two oxygen atoms. The lead atom is 8 coordinate and the O atoms form a flattened [[snub disphenoid|trigonal dodecahedron]].<ref>{{cite journal |last1=Schürmann |first1=M. |last2=Huber |first2=F. |title=A redetermination of lead(IV) acetate |journal=Acta Crystallographica Section C |volume=50 |issue=11 |year=1994 |pages=1710–1713 |issn=0108-2701 |doi=10.1107/S0108270194006438|doi-access=}}</ref> |
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==Preparation== |
==Preparation== |
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It is typically prepared by treating of [[red lead]] with [[acetic acid]] and [[acetic anhydride]] ({{chem2|Ac2O}}), which absorbs water. The net reaction is shown:<ref>{{cite book |author=J. C. Bailar, Jr. |title=Inorganic Syntheses |series=Inorganic Syntheses |volume=1 |pages=47–49 |year=1939 |chapter=Lead Tetracetate |doi=10.1002/9780470132326.ch17|isbn= |
It is typically prepared by treating of [[red lead]] with [[acetic acid]] and [[acetic anhydride]] ({{chem2|Ac2O}}), which absorbs water. The net reaction is shown:<ref>{{cite book |author=J. C. Bailar, Jr. |title=Inorganic Syntheses |series=Inorganic Syntheses |volume=1 |pages=47–49 |year=1939 |chapter=Lead Tetracetate |doi=10.1002/9780470132326.ch17|isbn=978-0-470-13232-6}}</ref><ref>{{cite book|author=M. Baudler|chapter=Lead(IV) Acetate|title=Handbook of Preparative Inorganic Chemistry, 2nd Ed. |editor=G. Brauer|publisher=Academic Press|year=1963|place=NY,NY|volume=2|pages=767}}</ref> |
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: |
:{{chem2|Pb3O4 + 4 Ac2O -> Pb(OAc)4 + 2 Pb(OAc)2}} |
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The remaining [[lead(II) acetate]] can be partially oxidized to the tetraacetate: |
The remaining [[lead(II) acetate]] can be partially oxidized to the tetraacetate by Cl<sub>2</sub>, with a [[Lead(II) chloride|PbCl<sub>2</sub>]] by-product: |
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: |
:{{chem2|2 Pb(OAc)2 + Cl2 -> Pb(OAc)4 + PbCl2}} |
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==Reagent in organic chemistry== |
==Reagent in organic chemistry== |
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Lead tetraacetate is a strong [[oxidizing agent]],<ref>{{cite journal |last=J. Zýka |title=Analytical study of the basic properties of lead tetraacetate as oxidizing agent |journal=Pure and Applied Chemistry |year=1966 |volume=13 |issue=4 |pages=569–581 |doi=10.1351/pac196613040569 |s2cid=96821219 |url=http://pac.iupac.org/publications/pac/pdf/1966/pdf/1304x0569.pdf | |
Lead tetraacetate is a strong [[oxidizing agent]],<ref>{{cite journal |last=J. Zýka |title=Analytical study of the basic properties of lead tetraacetate as oxidizing agent |journal=Pure and Applied Chemistry |year=1966 |volume=13 |issue=4 |pages=569–581 |doi=10.1351/pac196613040569 |s2cid=96821219 |url=http://pac.iupac.org/publications/pac/pdf/1966/pdf/1304x0569.pdf |access-date=19 December 2013}}</ref> a source of [[acetyloxy]] groups, and a general [[reagent]] for the preparation of [[organolead compound]]s. Some of its many uses in [[organic chemistry]]: |
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* |
*[[Acetoxylation]] of benzylic, allylic,<ref>{{cite journal|doi=10.15227/orgsyn.072.0057 |title=(1R,5R)-(+)-Verbenone of High Optical Purity |journal=Organic Syntheses |date=1995 |volume=72 |page=57 }}</ref> and α-oxygen ether C−H bonds, for example the conversion of [[dioxane]] to 2-acetoxy-1,4-dioxane <ref>[[Organic Syntheses]], Vol. 82, p.99 (2005) [http://www.orgsynth.org/orgsyn/prep.asp?prep=v82p0099 Article]. |
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</ref> |
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</ref> and the conversion of [[α-pinene]] to [[verbenone]]<ref>Organic Syntheses, Coll. Vol. 9, p.745 (1998); Vol. 72, p.57 (1995) [http://www.orgsynth.org/orgsyn/prep.asp?prep=cv9p0745 Article]</ref> |
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* An alternative reagent to [[bromine]] in [[Hofmann rearrangement]]<ref>{{cite journal|author1=Baumgarten, Henry |author2=Smith, Howard |author3=Staklis, Andris |title=Reactions of amines. XVIII. Oxidative rearrangement of amides with lead tetraacetate|journal=The Journal of Organic Chemistry|year=1975|volume=40|issue=24|pages=3554–3561|doi=10.1021/jo00912a019}}</ref> |
* An alternative reagent to [[bromine]] in [[Hofmann rearrangement]]<ref>{{cite journal|author1=Baumgarten, Henry |author2=Smith, Howard |author3=Staklis, Andris |title=Reactions of amines. XVIII. Oxidative rearrangement of amides with lead tetraacetate|journal=The Journal of Organic Chemistry|year=1975|volume=40|issue=24|pages=3554–3561|doi=10.1021/jo00912a019}}</ref> |
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* Dehydrogenation of hydrazones and hydrazines, for example that of hexafluoroacetone hydrazone to bis(trifluoromethyl)diazomethane<ref>{{cite journal |doi=10.15227/orgsyn.050.0006 |title=Bis(Trifluoromethyl)Diazomethane |journal=Organic Syntheses |date=1970 |volume=50 |page=6|first1=W. J. |last1=Middleton|first2=D. M. |last2=Gale }}</ref><ref>{{cite journal |doi=10.15227/orgsyn.055.0114 |title=Preparation of N-Aminoaziridines: trans-1-Amino-2,3-diphenylaziridine, 1-Amino-2-phenylaziridine, and 1-Amino-2-phenylaziridinium Acetate |journal=Organic Syntheses |date=1976 |volume=55 |page=114|author=Robert K. Muller, Renato Joos, Dorothee Felix, Jakob Schreiber, Claude Wintner, and A. Eschenmoser }}</ref> |
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* Oxidation of [[hydrazone]]s to [[diazo]] compounds, for example that of ''hexafluoroacetone hydrazone'' to ''bis(trifluoromethyl)diazomethane''<ref>Organic Syntheses, Coll. Vol. 6, p.161 (1988); Vol. 50, p.6 (1970) [http://www.orgsynth.org/orgsyn/prep.asp?prep=cv6p0161 Article].</ref> |
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* [[Aziridine]] formation, for example the reaction of [[phthalimide|''N''-aminophthalimide]] and [[stilbene]]<ref>[[Organic Syntheses]], Coll. Vol. 6, p.56 (1988); Vol. 55, p.114 (1976) [http://www.orgsynth.org/orgsyn/prep.asp?prep=cv6p0056 Link]</ref> |
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* [[Bond cleavage|Cleavage]] of [[Alpha hydroxy acid|α-hydroxy acids]]<ref>{{cite journal|last1=Ōeda|first1=Haruomi|title=Oxidation of some α-hydroxy-acids with lead tetraacetate|journal=Bulletin of the Chemical Society of Japan|date=1934|volume=9|issue=1|pages=8–14|doi=10.1246/bcsj.9.8|doi-access=free}}</ref> or 1,2-[[diol]]s to their corresponding [[aldehyde]]s or [[ketone]]s, often replacing [[ozonolysis]]; for instance, the oxidation of di-''n''-butyl {{sc|d}}-[[tartrate]] to ''n''-butyl [[glyoxylate]].<ref>Organic Syntheses, Coll. Vol. 4, p.124 (1963); Vol. 35, p.18 (1955) [http://www.orgsynth.org/orgsyn/prep.asp?prep=cv4p0124 Article].</ref> |
* [[Bond cleavage|Cleavage]] of [[Alpha hydroxy acid|α-hydroxy acids]]<ref>{{cite journal|last1=Ōeda|first1=Haruomi|title=Oxidation of some α-hydroxy-acids with lead tetraacetate|journal=Bulletin of the Chemical Society of Japan|date=1934|volume=9|issue=1|pages=8–14|doi=10.1246/bcsj.9.8|doi-access=free}}</ref> or 1,2-[[diol]]s to their corresponding [[aldehyde]]s or [[ketone]]s, often replacing [[ozonolysis]]; for instance, the oxidation of di-''n''-butyl {{sc|d}}-[[tartrate]] to ''n''-butyl [[glyoxylate]].<ref>Organic Syntheses, Coll. Vol. 4, p.124 (1963); Vol. 35, p.18 (1955) [http://www.orgsynth.org/orgsyn/prep.asp?prep=cv4p0124 Article].</ref> |
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* Reaction with [[alkene]]s to form γ-[[lactone]]s |
* Reaction with [[alkene]]s to form γ-[[lactone]]s |
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==Safety== |
==Safety== |
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Lead(IV) acetate |
Lead(IV) acetate is toxic. It is a neurotoxin. It affects the gum tissue, central nervous system, kidneys, blood, and reproductive system. |
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==References== |
==References== |
Latest revision as of 12:47, 4 July 2024
Names | |
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IUPAC name
Lead(IV) acetate
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Systematic IUPAC name
Tetrakis(acetyloxy)plumbane | |
Other names
Lead tetraacetate
Plumbic acetate | |
Identifiers | |
3D model (JSmol)
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.008.099 |
EC Number |
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PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
Pb(C2H3O2)4 | |
Molar mass | 443.376 g/mol |
Appearance | colorless or pink crystals |
Odor | vinegar |
Density | 2.228 g/cm3 (17 °C) |
Melting point | 175 °C (347 °F; 448 K) |
Boiling point | decomposes |
soluble, reversible hydrolysis | |
Solubility | reacts with ethanol soluble in chloroform, benzene, nitrobenzene, hot acetic acid, HCl, tetrachloroethane |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
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Toxic |
GHS labelling:[1] | |
Danger | |
NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Lead(IV) acetate or lead tetraacetate is an metalorganic compound with chemical formula Pb(C2H3O2)4. It is a colorless solid that is soluble in nonpolar, organic solvents, indicating that it is not a salt. It is degraded by moisture and is typically stored with additional acetic acid. The compound is used in organic synthesis.[2]
Structure
[edit]In the solid state the lead(IV) centers are coordinated by four acetate ions, which are bidentate, each coordinating via two oxygen atoms. The lead atom is 8 coordinate and the O atoms form a flattened trigonal dodecahedron.[3]
Preparation
[edit]It is typically prepared by treating of red lead with acetic acid and acetic anhydride (Ac2O), which absorbs water. The net reaction is shown:[4][5]
- Pb3O4 + 4 Ac2O → Pb(OAc)4 + 2 Pb(OAc)2
The remaining lead(II) acetate can be partially oxidized to the tetraacetate by Cl2, with a PbCl2 by-product:
- 2 Pb(OAc)2 + Cl2 → Pb(OAc)4 + PbCl2
Reagent in organic chemistry
[edit]Lead tetraacetate is a strong oxidizing agent,[6] a source of acetyloxy groups, and a general reagent for the preparation of organolead compounds. Some of its many uses in organic chemistry:
- Acetoxylation of benzylic, allylic,[7] and α-oxygen ether C−H bonds, for example the conversion of dioxane to 2-acetoxy-1,4-dioxane [8]
- An alternative reagent to bromine in Hofmann rearrangement[9]
- Dehydrogenation of hydrazones and hydrazines, for example that of hexafluoroacetone hydrazone to bis(trifluoromethyl)diazomethane[10][11]
- Cleavage of α-hydroxy acids[12] or 1,2-diols to their corresponding aldehydes or ketones, often replacing ozonolysis; for instance, the oxidation of di-n-butyl D-tartrate to n-butyl glyoxylate.[13]
- Reaction with alkenes to form γ-lactones
- Oxidation of alcohols carrying a δ-proton to cyclic ethers.[14]
- Oxidative cleavage of certain allyl alcohols in conjunction with ozone:[15][16]
- Transformation of 1,2-dicarboxylic acids or cyclic anhydrides to alkenes
- Conversion of acetophenones to phenyl acetic acids[17]
- Decarboxylation of carboxylic acids to alkyl halides in the Kochi reaction[18]
Safety
[edit]Lead(IV) acetate is toxic. It is a neurotoxin. It affects the gum tissue, central nervous system, kidneys, blood, and reproductive system.
References
[edit]- ^ "Substance Information - ECHA". echa.europa.eu.
- ^ Mihailo Lj. Mihailović; Živorad Čeković; Brian M. Mathes (2005). "Lead(IV) Acetate". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rl006.pub2. ISBN 978-0-471-93623-7.
- ^ Schürmann, M.; Huber, F. (1994). "A redetermination of lead(IV) acetate". Acta Crystallographica Section C. 50 (11): 1710–1713. doi:10.1107/S0108270194006438. ISSN 0108-2701.
- ^ J. C. Bailar, Jr. (1939). "Lead Tetracetate". Inorganic Syntheses. Inorganic Syntheses. Vol. 1. pp. 47–49. doi:10.1002/9780470132326.ch17. ISBN 978-0-470-13232-6.
- ^ M. Baudler (1963). "Lead(IV) Acetate". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2. NY,NY: Academic Press. p. 767.
- ^ J. Zýka (1966). "Analytical study of the basic properties of lead tetraacetate as oxidizing agent" (PDF). Pure and Applied Chemistry. 13 (4): 569–581. doi:10.1351/pac196613040569. S2CID 96821219. Retrieved 19 December 2013.
- ^ "(1R,5R)-(+)-Verbenone of High Optical Purity". Organic Syntheses. 72: 57. 1995. doi:10.15227/orgsyn.072.0057.
- ^ Organic Syntheses, Vol. 82, p.99 (2005) Article.
- ^ Baumgarten, Henry; Smith, Howard; Staklis, Andris (1975). "Reactions of amines. XVIII. Oxidative rearrangement of amides with lead tetraacetate". The Journal of Organic Chemistry. 40 (24): 3554–3561. doi:10.1021/jo00912a019.
- ^ Middleton, W. J.; Gale, D. M. (1970). "Bis(Trifluoromethyl)Diazomethane". Organic Syntheses. 50: 6. doi:10.15227/orgsyn.050.0006.
- ^ Robert K. Muller, Renato Joos, Dorothee Felix, Jakob Schreiber, Claude Wintner, and A. Eschenmoser (1976). "Preparation of N-Aminoaziridines: trans-1-Amino-2,3-diphenylaziridine, 1-Amino-2-phenylaziridine, and 1-Amino-2-phenylaziridinium Acetate". Organic Syntheses. 55: 114. doi:10.15227/orgsyn.055.0114.
{{cite journal}}
: CS1 maint: multiple names: authors list (link) - ^ Ōeda, Haruomi (1934). "Oxidation of some α-hydroxy-acids with lead tetraacetate". Bulletin of the Chemical Society of Japan. 9 (1): 8–14. doi:10.1246/bcsj.9.8.
- ^ Organic Syntheses, Coll. Vol. 4, p.124 (1963); Vol. 35, p.18 (1955) Article.
- ^ M B Smith, J March. March's Advanced Organic Chemistry (Wiley, 2001) (ISBN 0-471-58589-0)
- ^ Álvarez Manzaneda, E. J.; Chahboun, R.; Cano, M. J.; Cabrera Torres, E.; Álvarez, E.; Álvarez Manzaneda, R.; Haidour, A.; Ramos López, J. M. (2006). "O3/Pb(OAc)4: a new and efficient system for the oxidative cleavage of allyl alcohols". Tetrahedron Letters. 47 (37): 6619–6622. doi:10.1016/j.tetlet.2006.07.020.
- ^ Conversion of 1-allylcyclohexanol to cyclohexanone, in the proposed reaction mechanism the allyl group is first converted to a trioxalane according to conventional ozonolysis which then interacts with the alkoxy lead group.
- ^ Myrboh, B.; Ila, H.; Junjappa, H. (1981). "One-Step Synthesis of Methyl Arylacetates from Acetophenones Using Lead(IV) Acetate". Synthesis. 2 (2): 126–127. doi:10.1055/s-1981-29358.
- ^ Jay K. Kochi (1965). "A New Method for Halodecarboxylation of Acids Using Lead(IV) Acetate". J. Am. Chem. Soc. 87 (11): 2500–02. doi:10.1021/ja01089a041.