title: Reactions of a quintuply bonded chromium dimer with alkynes.
abstract: Quintuply bonded [(H)L(iPr)Cr](2) reacts with alkynes RC≡CR (R = Me, Et, Ph, CF(3)) to form exclusively 1 : 1 adducts [(H)L(iPr)Cr](2)(RCCR). All products feature relatively short Cr-Cr distances (1.919-1.962 Å) and elongated C-C bonds (1.315-1.436 Å), consistent with [2+2] cycloaddition reactions. The hydrocarbon adducts are 4-membered metallacycles, the bridging alkynes of which are progressively skewed with respect to the Cr-Cr axis. In contrast, perfluoroalkyne adds across the metal ligand moiety.
authors: Department of Chemistry and Biochemistry, Center for Catalytic Science and Technology, University of Delaware, Newark, DE 19711, USA.
authors: Jingmei
authors: J
authors: Shen
authors: Glenn P A
authors: GP
authors: Yap
authors: Jan-Philipp
authors: JP
authors: Werner
authors: Klaus H
authors: KH
authors: Theopold