Die 1,3‐dipolare Addition der Arylazide (II) an die Perfluoralkyl‐ bzw. Perfluorarylacetylene (I) ergibt Gemische der isomeren Triazole (IIIa) und (IVa) sowie (IIIb) und (IVb), in denen (IIIa) bzw. (IIIb) überwiegen, oder ausschließlich die Triazole (IIIc)‐(IIIe).
Additionen von 6‐Mercaptopurin (III) oder 8‐Mercaptohypoxanthin (VII) in Gegenwart eines Namethoxid‐Überschusses an Trifluormethylacetylen bzw. Propiolsäure liefern regio‐ und stereospezifisch die cis‐Ethenylthio‐Derivate (I) und (VI).
The title compounds (I) react with o‐diaminobenzene (II) to yield the benzimidazole (III), which is formed by reaction of (I) with one of the amino groups of compound (II), followed by intramolecular cyclization with the second amino group.
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