Die aliphatischen bzw. aromatischen Aldehyde (I) werden mit dem Thiophenol (II) zu den Thioacetalen (IIIa) bzw. (IIIb) kondensiert; ebenso werden in einer Variante dieser Reaktion aus den Ketonen (IV) die Thioketale (V) synthetisiert.
NN'-Dipyridinium disulphide dichloride (1) and 1-(4-nitrophenylthio)pyridinium chloride (5) and its 4-NMe2 derivative (2) have been synthesized and their structures established unambiguously ; they undergo nucleophilic attack a t sulphur rather than in the pyridine ring and the tetrafluoroborate from (5) serves as a possible source of 4-nitrophenylsulphenium ion which can attack anisole readily to give (7).
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