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{{short description|Organic redox reaction}}
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| Name = Swern oxidation
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| Type = Organic redox reaction
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⚫
The '''Swern oxidation''', contrary to popular opinion, is not a disease carried by swine. It is named after [[Daniel Swern]], and is a [[chemical reaction]] whereby a primary or secondary [[alcohol]] is [[redox|oxidized]] to an [[aldehyde]] or [[ketone]] using [[oxalyl chloride]], [[dimethyl sulfoxide|dimethyl sulfoxide (DMSO)]] and an organic base, such as [[triethylamine]].<ref>{{cite journal | title = Oxidation of alcohols by "activated" dimethyl sulfoxide. A preparative, steric and mechanistic study | author = Omura, K.; [[Daniel Swern|Swern, D.]] | journal = [[Tetrahedron (journal)|Tetrahedron]] | year = 1978 | volume = 34 | issue = 11 | pages = 1651 | doi = 10.1016/0040-4020(78)80197-5}}</ref><ref>{{cite journal | author = Mancuso, A. J.; Brownfain, D. S.; [[Daniel Swern|Swern, D.]] | title = Structure of the dimethyl sulfoxide-oxalyl chloride reaction product. Oxidation of heteroaromatic and diverse alcohols to carbonyl compounds | year = 1979 | journal = [[J. Org. Chem.]] | volume = 44 | issue = 23 | pages = 4148–4150 | doi = 10.1021/jo01337a028}}</ref><ref>{{cite journal | author = Mancuso, A. J.; Huang, S.-L.; [[Daniel Swern|Swern, D.]] | title = Oxidation of long-chain and related alcohols to carbonyls by dimethyl sulfoxide "activated" by oxalyl chloride | year = 1978 | journal = [[J. Org. Chem.]] | volume = 43 | issue = 12 | pages = 2480–2482 | doi = 10.1021/jo00406a041}}</ref> The reaction is known for its mild character and wide tolerance of [[functional group]]s.<ref>{{OrgSynth | author = Dondoni, A.; Perrone, D. | title = Synthesis of 1,1-Dimethyl Ethyl-(''S'')-4-formyl-2,2-dimethyl-3-oxazolidinecarboxylate by Oxidation of the Alcohol | collvol = 10 | collvolpages = 320 | year = 2004 | prep = v77p0064}}</ref><ref>{{OrgSynth | author = Bishop, R. | title = <nowiki>9-Thiabicyclo[3.3.1]nonane-2,6-dione</nowiki> | collvol = 9 | collvolpages = 692 | year = 1998 | prep = cv9p0692}}</ref><ref>{{OrgSynth | author = Leopold, E. J. | title = Selective hydroboration of a 1,3,7-triene: Homogeraniol | collvol = 7 | collvolpages = 258 | year = 1990 | prep = cv7p0258}}</ref><ref>{{cite book | author = Tojo, G.; Fernández, M. | title = Oxidation of alcohols to aldehydes and ketones: A guide to current common practice | publisher = Springer | year = 2006 | isbn = 0-387-23607-4}}</ref>


⚫
In [[organic chemistry]], the '''Swern oxidation''', named after [[Daniel Swern]], is a [[chemical reaction]] whereby a primary or secondary [[Alcohol (chemistry)|alcohol]] ({{chem2|\sOH}}) is [[redox|oxidized]] to an [[aldehyde]] ({{chem2|\sCH\dO}}) or [[ketone]] ({{chem2|>C\dO}}) using [[oxalyl chloride]], [[dimethyl sulfoxide]] (DMSO) and an organic [[Base (chemistry)|base]], such as [[triethylamine]].<ref>{{cite journal | title = Oxidation of alcohols by "activated" dimethyl sulfoxide. A preparative, steric and mechanistic study | author = Omura, K.; [[Daniel Swern|Swern, D.]] | journal = [[Tetrahedron (journal)|Tetrahedron]] | year = 1978 | volume = 34 | issue = 11 | pages = 1651–1660 | doi = 10.1016/0040-4020(78)80197-5}}</ref><ref>{{cite journal | author = Mancuso, A. J.; Brownfain, D. S.; [[Daniel Swern|Swern, D.]] | title = Structure of the dimethyl sulfoxide-oxalyl chloride reaction product. Oxidation of heteroaromatic and diverse alcohols to carbonyl compounds | year = 1979 | journal = [[J. Org. Chem.]] | volume = 44 | issue = 23 | pages = 4148–4150 | doi = 10.1021/jo01337a028}}</ref><ref>{{cite journal | author = Mancuso, A. J.; Huang, S.-L.; [[Daniel Swern|Swern, D.]] | title = Oxidation of long-chain and related alcohols to carbonyls by dimethyl sulfoxide "activated" by oxalyl chloride | year = 1978 | journal = [[J. Org. Chem.]] | volume = 43 | issue = 12 | pages = 2480–2482 | doi = 10.1021/jo00406a041}}</ref> It is one of the many oxidation reactions commonly referred to as 'activated DMSO' oxidations. The reaction is known for its mild character and wide tolerance of [[functional group]]s.<ref>{{OrgSynth | author = Dondoni, A.; Perrone, D. | title = Synthesis of 1,1-Dimethyl Ethyl-(''S'')-4-formyl-2,2-dimethyl-3-oxazolidinecarboxylate by Oxidation of the Alcohol | collvol = 10 | collvolpages = 320 | year = 2004 | prep = v77p0064}}</ref><ref>{{OrgSynth | author = Bishop, R. | title = <nowiki>9-Thiabicyclo[3.3.1]nonane-2,6-dione</nowiki> | collvol = 9 | collvolpages = 692 | year = 1998 | prep = cv9p0692}}</ref><ref>{{OrgSynth | author = Leopold, E. J. | title = Selective hydroboration of a 1,3,7-triene: Homogeraniol | collvol = 7 | collvolpages = 258 | year = 1990 | prep = cv7p0258}}</ref><ref>{{cite book |author1=Tojo, G. |author2=Fernández, M. | title = Oxidation of alcohols to aldehydes and ketones: A guide to current common practice | publisher = Springer | year = 2006 | isbn = 0-387-23607-4}}</ref>
⚫
[[Image:Swern Oxidation Scheme.png|center|400px|The Swern oxidation.]]


⚫
[[File:Swern Oxidation Scheme.png|center|400px|The Swern oxidation.]]
The by-products are [[dimethyl sulfide]] (Me<sub>2</sub>S), [[carbon monoxide]] (CO), [[carbon dioxide]] (CO<sub>2</sub>) and — when [[triethylamine]] is used as base — [[triethylammonium chloride]] (Et<sub>3</sub>NHCl). Two of the by-products, [[dimethyl sulfide]] and [[carbon monoxide]], are very toxic volatile compounds, so the reaction and the work-up needs to be performed in a fume hood. [[Dimethyl sulfide]] is a volatile liquid (B.P. 37&nbsp;°C) with an extremely unpleasant odour.


<ref>{{cite journal | author = Mancuso, A. J.; [[Daniel Swern|Swern, D.]] | title = Activated dimethyl sulfoxide: Useful reagents for synthesis | journal = [[Synthesis (journal)|Synthesis]] | year = 1981 | volume = 1981 | issue = 03 | pages = 165–185 | doi = 10.1055/s-1981-29377 | type = Review}}</ref><ref>{{cite journal | author = Tidwell, T. T. | title = Oxidation of alcohols to carbonyl compounds via alkoxysulfonium ylides: The Moffatt, Swern, and related oxidations | journal = [[Org. React.]] | year = 1990 | volume = 39 | pages = 297–572 | doi = 10.1002/0471264180.or039.03 | type = Review}}</ref><ref>{{cite journal | author = Tidwell, T. T. | title = Oxidation of alcohols by activated dimethyl sulfoxide and related reactions: An update | journal = [[Synthesis (journal)|Synthesis]] | year = 1990 | volume = 1990 | issue = 10 | pages = 857–870 | type = Review | doi = 10.1055/s-1990-27036}}</ref>
The by-products are [[dimethyl sulfide]] ((CH<sub>3</sub>)<sub>2</sub>S), [[carbon monoxide]] (CO), [[carbon dioxide]] (CO<sub>2</sub>) and—when triethylamine is used as base—[[triethylammonium chloride]] (Et<sub>3</sub>NHCl). Of the volatile by-products, dimethyl sulfide has a strong, pervasive odour and carbon monoxide is acutely toxic, so the reaction and the work-up needs to be performed in a fume hood. Dimethyl sulfide is a volatile liquid (B.P. 37&nbsp;°C) with an unpleasant odour at even low concentrations.<ref>{{cite journal | author = Mancuso, A. J.; [[Daniel Swern|Swern, D.]] | title = Activated dimethyl sulfoxide: Useful reagents for synthesis | journal = [[Synthesis (journal)|Synthesis]] | year = 1981 | volume = 1981 | issue = 3 | pages = 165–185 | doi = 10.1055/s-1981-29377 | type = Review}}</ref><ref>{{cite journal | author = Tidwell, T. T. | title = Oxidation of alcohols to carbonyl compounds via alkoxysulfonium ylides: The Moffatt, Swern, and related oxidations | journal = [[Org. React.]] | year = 1990 | volume = 39 | pages = 297–572 | doi = 10.1002/0471264180.or039.03 | isbn = 0471264180 | type = Review}}</ref><ref>{{cite journal | author = Tidwell, T. T. | title = Oxidation of alcohols by activated dimethyl sulfoxide and related reactions: An update | journal = [[Synthesis (journal)|Synthesis]] | year = 1990 | volume = 1990 | issue = 10 | pages = 857–870 | type = Review | doi = 10.1055/s-1990-27036}}</ref>


==Mechanism==
==Mechanism==
The first step of the '''Swern oxidation''' is the low-temperature reaction of [[dimethyl sulfoxide]] (DMSO), '''1a''', formally as [[resonance (chemistry)|resonance]] contributor '''1b''', with [[oxalyl chloride]], '''2'''. The first intermediate, '''3''', quickly decomposes giving off [[Carbon dioxide|CO<sub>2</sub>]] and [[Carbon monoxide|CO]] and producing chloro(dimethyl)sulfonium chloride, '''4'''.
The first step of the Swern oxidation is the low-temperature reaction of DMSO, '''1a''', formally as [[resonance (chemistry)|resonance]] contributor '''1b''', with oxalyl chloride, '''2'''. The first intermediate, '''3''', quickly decomposes giving off carbon dioxide and carbon monoxide and producing chloro(dimethyl)sulfonium chloride, '''4'''.


[[Image:Dimethylchlorosulfonium Formation Mechanism.png|600px|center|Dimethylchlorosulfonium chloride formation.]]
[[File:Dimethylchlorosulfonium Formation Mechanism.png|600px|center|Dimethylchlorosulfonium chloride formation.]]


After addition of the alcohol '''5''', the chloro(dimethyl)sulfonium chloride '''4''' reacts with the alcohol to give the key alkoxysulfonium ion intermediate, '''6'''. The addition of at least 2 equivalents of base — typically [[triethylamine]] — will [[deprotonation|deprotonate]] the alkoxysulfonium ion to give the sulfur [[ylide]] '''7'''. In a five-membered ring [[transition state]], the sulfur ylide '''7''' decomposes to give [[dimethyl sulfide]] and the desired ketone (or aldehyde) '''8'''.
After addition of the alcohol '''5''', the chloro(dimethyl)sulfonium chloride '''4''' reacts with the alcohol to give the key alkoxysulfonium ion intermediate, '''6'''. The addition of at least 2 equivalents of base — typically triethylamine — will [[deprotonation|deprotonate]] the alkoxysulfonium ion to give the sulfur [[ylide]] '''7'''. In a five-membered ring [[transition state]], the sulfur ylide '''7''' decomposes to give dimethyl sulfide and the desired [[carbonyl]] compound '''8'''.


[[Image:Swern Oxidation Mechanism.png|600px|center|The mechanism of the Swern oxidation.]]
[[File:Swern Oxidation Mechanism.png|600px|center|The mechanism of the Swern oxidation.]]


==Variations==
==Variations==
When using oxalyl chloride as the [[dehydration]] agent, the reaction must be kept colder than &minus;60&nbsp;°C to avoid side reactions. With [[cyanuric chloride]]<ref>http://pubs.acs.org/doi/abs/10.1021/jo015935s De Luca, L.; Giacomelli, G.; Procheddu, A. J. Org. Chem. 2001, 7907.</ref> or [[trifluoroacetic anhydride]] instead of oxalyl chloride, the reaction can be warmed to &minus;30&nbsp;°C without side reactions. Other methods for the activation of DMSO to initiate the formation of the key intermediate '''6''' are the use of [[carbodiimides]] ([[Pfitzner–Moffatt oxidation]]) and pyridine-sulfur trioxide complex ([[Parikh-Doering oxidation]]). The intermediate '''4''' can also be prepared from dimethyl sulfide and [[N-Chlorosuccinimide|''N''-chlorosuccinimide]] (the [[Corey-Kim oxidation]]).
When using oxalyl chloride as the [[Dehydration reaction|dehydration]] agent, the reaction must be kept colder than &minus;60&nbsp;°C to avoid side reactions. With [[cyanuric chloride]]<ref>{{cite journal|doi=10.1021/jo015935s | volume=66 | title=A Mild and Efficient Alternative to the Classical Swern Oxidation | journal=The Journal of Organic Chemistry | pages=7907–7909 | author=De Luca Lidia| year=2001 | issue=23 | pmid=11701058 }}</ref> or [[trifluoroacetic anhydride]]<ref>{{cite journal|doi=10.1021/jo00868a012|title=Dimethyl Sulfoxide-Trifluoroacetic Anhydride. New Reagent for Oxidation of Alcohols to Carbonyls|last1=Omura|first1=Kanji|last2=Sharma|first2=Ashok K.|last3=Swern|first3=Daniel|journal=[[J. Org. Chem.]]|year=1976|volume=41|issue=6|pages=957–962}}</ref> instead of oxalyl chloride, the reaction can be warmed to &minus;30&nbsp;°C without side reactions. Other methods for the activation of DMSO to initiate the formation of the key intermediate '''6''' are the use of [[carbodiimides]] ([[Pfitzner–Moffatt oxidation]]), a [[sulfur trioxide pyridine complex]] ([[Parikh–Doering oxidation]]) or [[acetic anhydride]] ([[Albright-Goldman oxidation]]). The intermediate '''4''' can also be prepared from dimethyl sulfide and [[N-Chlorosuccinimide|''N''-chlorosuccinimide]] (the [[Corey–Kim oxidation]]).


In some cases, the use of [[triethylamine]] as the base can lead to epimerisation at the carbon alpha to the newly formed carbonyl. Using the bulkier base [[diisopropylethylamine]] (''i''Pr<sub>2</sub>NEt, Hünig's base) can mitigate this side reaction.
In some cases, the use of triethylamine as the base can lead to [[epimerisation]] at the [[alpha and beta carbon|carbon alpha]] to the newly formed carbonyl. Using a [[steric effects|bulkier]] base, such as [[diisopropylethylamine]], can mitigate this side reaction.


==Considerations==
==Considerations==
[[Dimethyl sulfide]], a byproduct of the Swern oxidation, is one of the most foul odors known in organic chemistry. Human olfactory glands can detect this compound in concentrations as low as 0.02 to 0.1 parts per million.<ref>{{ cite book | author = Morton, T. H. | year = 2000 | chapter = Archiving Odors | editor = Bhushan, N.; Rosenfeld, S. | title = Of Molecules and Mind | pages = 205–216 | location = Oxford | publisher = Oxford University Press }}</ref> A simple remedy for this problem is to rinse used glassware with [[bleach]] (usually containing [[sodium hypochlorite]]), which will oxidize the dimethyl sulfide, eliminating the smell.
Dimethyl sulfide, a byproduct of the Swern oxidation, is one of the most notoriously unpleasant odors known in organic chemistry. Humans can detect this compound in concentrations as low as 0.02 to 0.1 parts per million.<ref>{{cite book | author = Morton, T. H. | year = 2000 | chapter = Archiving Odors |editor1=Bhushan, N. |editor2=Rosenfeld, S. | title = Of Molecules and Mind | pages = 205–216 | location = Oxford | publisher = Oxford University Press}}</ref> A simple remedy for this problem is to rinse used glassware with [[bleach]] or [[oxone]] solution, which will oxidize the dimethyl sulfide back to dimethyl sulfoxide or to [[dimethyl sulfone]], both of which are odourless and nontoxic.<ref>{{cite journal |title= Safe Handling of Boranes at Scale | first1=William J. Jr. | last1=Atkins |first2= Elizabeth R. |last2= Burkhardt |first3= Karl |last3= Matos |journal= Org. Process Res. Dev. |year= 2006 | volume= 10 |issue= 6 |pages= 1292–1295 |doi= 10.1021/op068011l}}</ref>


The reaction conditions allow oxidation of acid-sensitive compounds, which might decompose under the acidic conditions of a traditional method such as [[Jones oxidation]]. For example, in Thompson & Heathcock's synthesis of the [[sesquiterpene]] isovelleral,<ref name="Thompson1992">{{cite journal|last=Thompson|first=S. K.|author2=Heathcock, C. H. |year=1992|title=Total synthesis of some marasmane and lactarane sesquiterpenes|journal=[[J. Org. Chem.]]|volume=57|issue=22|pages=5979–5989|doi=10.1021/jo00048a036}}</ref> the final step uses the Swern protocol, avoiding [[rearrangement reaction|rearrangement]] of the acid-sensitive cyclopropanemethanol moiety.
The reaction conditions allow oxidation of acid-sensitive compounds, which might decompose under the acidic oxidation conditions such as [[Jones oxidation]]. For example, in Thompson & Heathcock's synthesis of the [[sesquiterpene]] isovelleral,<ref name="Thompson1992">{{cite journal|last=Thompson|first=S. K.|author2=Heathcock, C. H. |year=1992|title=Total synthesis of some marasmane and lactarane sesquiterpenes|journal=[[J. Org. Chem.]]|volume=57|issue=22|pages=5979–5989|doi=10.1021/jo00048a036}}</ref> the final step uses the Swern protocol, avoiding [[rearrangement reaction|rearrangement]] of the acid-sensitive cyclopropanemethanol moiety.


[[File:IsovelleralPreparationViaSwernOxidation.png|500px|center]]
[[File:IsovelleralPreparationViaSwernOxidation.png|500px|center]]


==See also==
==See also==
⚫
* [[Alcohol oxidation]]
* [[Sulfonium-based oxidation of alcohols to aldehydes]]
* [[Pyridinium chlorochromate]]
* [[Jones oxidation]]
* [[Oppenauer oxidation]]
* [[Pfitzner–Moffatt oxidation]]
* [[Parikh–Doering oxidation]]
* [[Parikh–Doering oxidation]]
* [[Dess–Martin periodinane]]
* [[Albright-Goldman oxidation]]
* [[Corey–Kim oxidation]]
* [[Corey–Kim oxidation]]
* [[Dess–Martin periodinane]] oxidation
⚫
* [[Pfitzner–Moffatt oxidation]]
* [[Ley oxidation]] ([[Tetrapropylammonium perruthenate|TPAP]] oxidation)
* [[TEMPO]] oxidation


==References==
==References==
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==External links==
==External links==
* [http://www.organic-chemistry.org/namedreactions/swern-oxidation.shtm Organic Chemistry Portal]
* [https://www.organic-chemistry.org/namedreactions/swern-oxidation.shtm Organic Chemistry Portal]


{{DEFAULTSORT:Swern Oxidation}}
{{DEFAULTSORT:Swern Oxidation}}
[[Category:Organic redox reactions]]
[[Category:Organic oxidation reactions]]
[[Category:Name reactions]]
[[Category:Name reactions]]

Latest revision as of 17:16, 26 December 2023

Swern oxidation
Named after Daniel Swern
Reaction type Organic redox reaction
Identifiers
Organic Chemistry Portal swern-oxidation
RSC ontology ID RXNO:0000154
 ☒N(what is this?)  (verify)

In organic chemistry, the Swern oxidation, named after Daniel Swern, is a chemical reaction whereby a primary or secondary alcohol (−OH) is oxidized to an aldehyde (−CH=O) or ketone (>C=O) using oxalyl chloride, dimethyl sulfoxide (DMSO) and an organic base, such as triethylamine.[1][2][3] It is one of the many oxidation reactions commonly referred to as 'activated DMSO' oxidations. The reaction is known for its mild character and wide tolerance of functional groups.[4][5][6][7]

The Swern oxidation.
The Swern oxidation.

The by-products are dimethyl sulfide ((CH3)2S), carbon monoxide (CO), carbon dioxide (CO2) and—when triethylamine is used as base—triethylammonium chloride (Et3NHCl). Of the volatile by-products, dimethyl sulfide has a strong, pervasive odour and carbon monoxide is acutely toxic, so the reaction and the work-up needs to be performed in a fume hood. Dimethyl sulfide is a volatile liquid (B.P. 37 °C) with an unpleasant odour at even low concentrations.[8][9][10]

Mechanism

[edit]

The first step of the Swern oxidation is the low-temperature reaction of DMSO, 1a, formally as resonance contributor 1b, with oxalyl chloride, 2. The first intermediate, 3, quickly decomposes giving off carbon dioxide and carbon monoxide and producing chloro(dimethyl)sulfonium chloride, 4.

Dimethylchlorosulfonium chloride formation.
Dimethylchlorosulfonium chloride formation.

After addition of the alcohol 5, the chloro(dimethyl)sulfonium chloride 4 reacts with the alcohol to give the key alkoxysulfonium ion intermediate, 6. The addition of at least 2 equivalents of base — typically triethylamine — will deprotonate the alkoxysulfonium ion to give the sulfur ylide 7. In a five-membered ring transition state, the sulfur ylide 7 decomposes to give dimethyl sulfide and the desired carbonyl compound 8.

The mechanism of the Swern oxidation.
The mechanism of the Swern oxidation.

Variations

[edit]

When using oxalyl chloride as the dehydration agent, the reaction must be kept colder than −60 °C to avoid side reactions. With cyanuric chloride[11] or trifluoroacetic anhydride[12] instead of oxalyl chloride, the reaction can be warmed to −30 °C without side reactions. Other methods for the activation of DMSO to initiate the formation of the key intermediate 6 are the use of carbodiimides (Pfitzner–Moffatt oxidation), a sulfur trioxide pyridine complex (Parikh–Doering oxidation) or acetic anhydride (Albright-Goldman oxidation). The intermediate 4 can also be prepared from dimethyl sulfide and N-chlorosuccinimide (the Corey–Kim oxidation).

In some cases, the use of triethylamine as the base can lead to epimerisation at the carbon alpha to the newly formed carbonyl. Using a bulkier base, such as diisopropylethylamine, can mitigate this side reaction.

Considerations

[edit]

Dimethyl sulfide, a byproduct of the Swern oxidation, is one of the most notoriously unpleasant odors known in organic chemistry. Humans can detect this compound in concentrations as low as 0.02 to 0.1 parts per million.[13] A simple remedy for this problem is to rinse used glassware with bleach or oxone solution, which will oxidize the dimethyl sulfide back to dimethyl sulfoxide or to dimethyl sulfone, both of which are odourless and nontoxic.[14]

The reaction conditions allow oxidation of acid-sensitive compounds, which might decompose under the acidic oxidation conditions such as Jones oxidation. For example, in Thompson & Heathcock's synthesis of the sesquiterpene isovelleral,[15] the final step uses the Swern protocol, avoiding rearrangement of the acid-sensitive cyclopropanemethanol moiety.

See also

[edit]

References

[edit]
  1. ^ Omura, K.; Swern, D. (1978). "Oxidation of alcohols by "activated" dimethyl sulfoxide. A preparative, steric and mechanistic study". Tetrahedron. 34 (11): 1651–1660. doi:10.1016/0040-4020(78)80197-5.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  2. ^ Mancuso, A. J.; Brownfain, D. S.; Swern, D. (1979). "Structure of the dimethyl sulfoxide-oxalyl chloride reaction product. Oxidation of heteroaromatic and diverse alcohols to carbonyl compounds". J. Org. Chem. 44 (23): 4148–4150. doi:10.1021/jo01337a028.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. ^ Mancuso, A. J.; Huang, S.-L.; Swern, D. (1978). "Oxidation of long-chain and related alcohols to carbonyls by dimethyl sulfoxide "activated" by oxalyl chloride". J. Org. Chem. 43 (12): 2480–2482. doi:10.1021/jo00406a041.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  4. ^ Dondoni, A.; Perrone, D. (2004). "Synthesis of 1,1-Dimethyl Ethyl-(S)-4-formyl-2,2-dimethyl-3-oxazolidinecarboxylate by Oxidation of the Alcohol". Organic Syntheses{{cite journal}}: CS1 maint: multiple names: authors list (link); Collected Volumes, vol. 10, p. 320.
  5. ^ Bishop, R. (1998). "9-Thiabicyclo[3.3.1]nonane-2,6-dione". Organic Syntheses; Collected Volumes, vol. 9, p. 692.
  6. ^ Leopold, E. J. (1990). "Selective hydroboration of a 1,3,7-triene: Homogeraniol". Organic Syntheses; Collected Volumes, vol. 7, p. 258.
  7. ^ Tojo, G.; Fernández, M. (2006). Oxidation of alcohols to aldehydes and ketones: A guide to current common practice. Springer. ISBN 0-387-23607-4.
  8. ^ Mancuso, A. J.; Swern, D. (1981). "Activated dimethyl sulfoxide: Useful reagents for synthesis". Synthesis (Review). 1981 (3): 165–185. doi:10.1055/s-1981-29377.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  9. ^ Tidwell, T. T. (1990). "Oxidation of alcohols to carbonyl compounds via alkoxysulfonium ylides: The Moffatt, Swern, and related oxidations". Org. React. (Review). 39: 297–572. doi:10.1002/0471264180.or039.03. ISBN 0471264180.
  10. ^ Tidwell, T. T. (1990). "Oxidation of alcohols by activated dimethyl sulfoxide and related reactions: An update". Synthesis (Review). 1990 (10): 857–870. doi:10.1055/s-1990-27036.
  11. ^ De Luca Lidia (2001). "A Mild and Efficient Alternative to the Classical Swern Oxidation". The Journal of Organic Chemistry. 66 (23): 7907–7909. doi:10.1021/jo015935s. PMID 11701058.
  12. ^ Omura, Kanji; Sharma, Ashok K.; Swern, Daniel (1976). "Dimethyl Sulfoxide-Trifluoroacetic Anhydride. New Reagent for Oxidation of Alcohols to Carbonyls". J. Org. Chem. 41 (6): 957–962. doi:10.1021/jo00868a012.
  13. ^ Morton, T. H. (2000). "Archiving Odors". In Bhushan, N.; Rosenfeld, S. (eds.). Of Molecules and Mind. Oxford: Oxford University Press. pp. 205–216.
  14. ^ Atkins, William J. Jr.; Burkhardt, Elizabeth R.; Matos, Karl (2006). "Safe Handling of Boranes at Scale". Org. Process Res. Dev. 10 (6): 1292–1295. doi:10.1021/op068011l.
  15. ^ Thompson, S. K.; Heathcock, C. H. (1992). "Total synthesis of some marasmane and lactarane sesquiterpenes". J. Org. Chem. 57 (22): 5979–5989. doi:10.1021/jo00048a036.
[edit]
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