Palladium-Catalyzed α‑Ketocyclopropanation of Norbornenes with Propargyl Acetates

Propargyl acetates reacted with norbornene in the presence of a catalytic amount of tetrakis­(tripheylphosphine)palladium to give cyclopropyl ketones. The reaction proceeded with high stereoselectivity, affording a single stereoisomer. The reaction of various substituted norbornenes gave the corresponding cyclopropanes in moderate to good yields

Synthesis of Multinuclear Copper Complexes Bridged by Diquinolylamidinates and Their Application to Copper-Catalyzed Coupling of Terminal Alkynes and Aryl, Allyl, and Benzyl Halides

A dinuclear copper complex containing <i>N</i>,<i>N</i>′-diquinolylformamidinate and a tetranuclear copper complex containing <i>N</i>,<i>N</i>′-diquinolylacetamidinate were synthesized. The structure of complexes was confirmed by X-ray analysis, showing that copper atoms were bridged by amidinates and hydroxo or oxo ligands. The multinuclear copper complexes were effective for the coupling reactions of terminal alkynes and aryl, allyl, and benzyl halides