Reactions of a quintuply bonded chromium dimer with alkynes

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....

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Published inChemical communications (Cambridge, England) Vol. 47; no. 44; pp. 12191 - 12193
Main Authors Shen, Jingmei, Yap, Glenn P A, Werner, Jan-Philipp, Theopold, Klaus H
Format Journal Article
LanguageEnglish
Published England 28.11.2011
Subjects
Adducts
Alkynes
Bonding
Carbon-carbon composites
Chromium
Elongation
Hydrocarbons
Ligands
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Summary: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.
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ISSN:1359-7345
1364-548X
DOI:10.1039/c1cc15218a