Abstract
AbstractA convenient synthesis of the fluorenylidene and the 4,5‐diazafluorenylidene moiety is described. The palladium‐catalyzed coupling of 6,6′‐dimethyl‐2,2′‐bipyrdine‐3,3′‐diyl bis(triflate) (2) with phenylacetylene leads to the 4,5‐diazafluorenylidene compound 4 as the major reaction product by an intramolecular cyclization. Under the same conditions biphenyl‐2,2′‐diyl bis(triflate) (6) gives the threefold coupling product 7. The connectivity of 4 and 7 is confirmed by crystal structure analysis.
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