- Palladium-catalyzed desulfitative heck-type reaction of aryl sulfinic acids with alkenes
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An efficient protocol has been developed for the desulfitative Heck-type reaction of aryl sulfinic acids with a variety of alkenes in the presence of a catalytic amount of Pd(OAc)2 and inexpensive Cu(OAc)2 as oxidant. This method does not require a ligand or a base, thereby broadening the scope of Pd-catalyzed coupling reactions. Copyright
- Wang, Guan-Wu,Miao, Tao
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supporting information; experimental part
p. 5787 - 5790
(2011/06/23)
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- Nitrosations with hydrazine derivatives: Synthesis of N4-arenesulfinylsemicarbazides and N5-arenesulfinyl-N1-aminobiuretes from arenesulfinylisocyanates and N,N-disubstituted hydrazines
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Arenesulfinyl-isocyanates 5 prepared in situ from arenesulfinyl chlorides 4 and silver cyanate react with N,N-disubstituted hydrazines to mixtures of N4-arenesulfinylsemicarbazides 6 as main components and N5-arenesulfinyl-N1/s
- Hanefeld,Landwehr
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p. 344 - 351
(2007/10/02)
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- STUDIEN ZUM VORGANG DER WASSERSTOFFUEBERTRAGUNG 64. ELECTROREDUCTIVE SPALTUNG VON ARYLSULFONSAEUREDERIVATEN UND ARYLSULFONEN MIT ALKALI-AMALGAMEN
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Arylsulfonylchlorides, n-hexylarylsulfonates and di-aryl sulfones (ArSO2Y; Y=Cl, OC6H13, Ar') were cleaved under standard conditions by alkali metal amalgams (M/Hg; M=Li, Na, K) to the corresponding sulfinate salts (ArSO2M) and MY, as shown in Eq. 1.The substrates ArSO2Y in toluene were not cleaved by Li/Hg alone; first on addition of an equimolar amount of i-propanol could conversions of almost 100percent be achieved. (Tables I,II,III).A series of six n-hexylarylsulfonates were studied under standard conditions, to establish the influence of the reaction medium and the amalgam on the course of reaction, (Table II).The sterically hindered arylsulfonates ArSO2OC6H13, (Ar= mesityl, 2,4,6-tri-isopropyl) were "anomalous", i.e. underwent fission at the ring/sulfur bond , as shown by Eq. 2.Table III describes the reductive fission of mesityl-phenylsulfone and dimesitylsulfone.
- Horner, Leopold,Schmitt, Rolf-Erhard
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p. 301 - 308
(2007/10/02)
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