A-Thioketocarboxylic acids

In the previous examples, the sulfur atom acted as a nucleophile. Electron-deficient sulfur species such as sulfenyl ion and its equivalents (e.g. disulfide/Lewis acid complexes, sulfenic acids, sulfenyl halides, sulfonium ions, sulfines, etc.), can also serve as an electrophile. Oxidative ring closure of enethiols (a-thioketocarboxylic acid) (124), which proceeds via disulfides, produces thiophenes (125) in good yields (86EUP158380, 88JHC367). [Pg.533]

Oxidative ring closure of enethiols (a-thioketocarboxylic acid) (46), which proceeds via disulfides, produces thiophenes (47) in good yields (Equation (5)) <86EUPI58380,88JHC367). [Pg.613]

Acoxythioethers Diacyl sulfides Episulfones a, P-Elhy lenesulf ones a-Ketodiiolic acid esters a,P-Oxidosulfoxides a-Thioketocarboxylic acids... [Pg.293]

Thioketals s. Mercaptals a-Thioketocarboxylic acids s. a-Mercapto-/ ,a-ethylene-carboxylic acids Thioketones... [Pg.334]

Thioketocarboxylic acid esters from a,y -ethylene-) -aminocarboxylic acid esters ... [Pg.202]

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