Tetraethylpyrazine-2,3,5,6-tetracarboxamide forms a dipalladium(II) complex with acetates occupying the fourth coordination sites of the two bound metal ions. Crystallographic results indicate that the "duplex" dipincer has captured two protons that serve as the counterions. The protons lie between adjacent amide carbonyl groups with very short O···O distances of 2.
View Article and Find Full Text PDFCopper-catalyzed coupling of imines, vinylstannanes, or alkynes and o-bromoaroyl chlorides followed by Pd(0)-catalyzed annulations afforded indenoisoquinolines. Protocols requiring minimal purifications were developed, providing new methods for the construction of combinatorial libraries.
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