1950
DOI: 10.1021/ja01157a018
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Thermal Rearrangement of Allyl-type Sulfoxides, Sulfones and Sulfinates1

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Cited by 78 publications
(24 citation statements)
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“…According to MP2/6-311 + G-(2d,p) calculations (Table 1), dimethyl sulfone is 50.4 kJ mol À1 (DDG 0 ) more stable than the isomeric methyl methanesulfinate. In line with this calculated energy difference, alkyl, [156] alkenyl, [157] and alkynyl [158] sulfinic esters rearrange to the thermodynamically more stable sulfones. For allylic sulfinic esters this rearrangement is believed to proceed by a [2,3] sigmatropic shift, [157,159] whereas the rearrangement proceeds through ionization and ion pair recombination if R + is a stabilized carbocation (Scheme 73).…”
Section: Enolate Anionssupporting
confidence: 67%
“…According to MP2/6-311 + G-(2d,p) calculations (Table 1), dimethyl sulfone is 50.4 kJ mol À1 (DDG 0 ) more stable than the isomeric methyl methanesulfinate. In line with this calculated energy difference, alkyl, [156] alkenyl, [157] and alkynyl [158] sulfinic esters rearrange to the thermodynamically more stable sulfones. For allylic sulfinic esters this rearrangement is believed to proceed by a [2,3] sigmatropic shift, [157,159] whereas the rearrangement proceeds through ionization and ion pair recombination if R + is a stabilized carbocation (Scheme 73).…”
Section: Enolate Anionssupporting
confidence: 67%
“…PhNCO and PhNCS were obtained from Aldrich. The allylic substrates (6, [26] 13, [27] 16, [28] 17 [29] ) were prepared according to modified literature procedures. [30,31] The side reaction of nBuLi with the heterocumulenes should, under favorable conditions, occur only in small quantities, since the allylic species chosen contain carbanion-stabilizing groups.…”
Section: Methodsmentioning
confidence: 99%
“…Nach MP2/6-311 + G(2d,p)-Rechnungen (Tabelle 1) ist Dimethylsulfon um 50.4 kJ mol À1 (DDG 0 ) stabiler als das isomere Methylmethansulfinat. In Übereinstim-mung mit dieser berechneten Energiedifferenz lagern Alkyl-, [156] Alkenyl- [157] und Alkinylsulfinsäureester [158] in die thermodynamisch stabileren Sulfone um. Für die Umlagerung allylischer Sulfinsäureester wird eine [2,3]-sigmatrope Verschiebung angenommen, [157,159] während die Umlagerung über Ionisation und Ionenpaar-Rekombination erfolgt, wenn R + ein stabilisiertes Carbokation ist (Schema 73).…”
Section: Angewandte Chemieunclassified
“…In Übereinstim-mung mit dieser berechneten Energiedifferenz lagern Alkyl-, [156] Alkenyl- [157] und Alkinylsulfinsäureester [158] in die thermodynamisch stabileren Sulfone um. Für die Umlagerung allylischer Sulfinsäureester wird eine [2,3]-sigmatrope Verschiebung angenommen, [157,159] während die Umlagerung über Ionisation und Ionenpaar-Rekombination erfolgt, wenn R + ein stabilisiertes Carbokation ist (Schema 73). [156] Unabhängig vom Mechanismus der Umlagerung belegen diese Beobachtungen die höhere thermodynamische Stabilität der Sulfone.…”
Section: Angewandte Chemieunclassified