Zinn in der Peripherie von Bis(aren)metall-Komplexen des Vanadiums und Chroms

Alkyl and Aryl Derivatives of the Alkali Metals: Strong Bases and Reactive Nucleophiles. 2. Wilhelm Schlenk’s Organoalkali-Metal Chemistry. The Metal Displacement and the Transmetalation Reactions. Metalation of Weakly Acidic Hydrocarbons. Superbases

“…Its reaction with CO 2 gave, as expected, valeric acid. The filtrate was shown by IR spectroscopy to contain n -C 4 H 9 Li· tert -C 4 H 9 OLi, which Lochmann et al had studied earlier …”

“…1,1′-Dilithiodibenzenechromium, free of the monolithiated species usually obtained as a byproduct in the direct lithiation of dibenzenechromium, could be prepared by the reaction shown in eq 61 . ((Chloromercurio)cyclobutadiene)iron tricarbonyl underwent Li/Hg exchange with phenyllithium at −78 °C to give the useful monolithio derivative (eq 62).…”

Bis(benzene)chromium. 2. Its Discovery by E. O. Fischer and W. Hafner and Subsequent Work by the Research Groups of E. O. Fischer, H. H. Zeiss, F. Hein, C. Elschenbroich, and Others

“…Treatment of these complexes with pyridine-4-carboxaldehyde gave the radical cations, while a potassium mirror reduced them to the radical anions. 119 (In contrast to earlier workers, Elschenbroich calls the [(arene) 2 Cr] + cations "radical cations" in order to emphasize the presence of their one unpaired electron.) Also prepared in this manner were (1,4-(ClMe 2 Si) 2 C 6 H 4 ) 2 Cr and (ClMe 2 SiC 6 H 5 ) 2 Si.…”

“…Sodium naphthalenide in DME converted the latter to the germachromocyclophane 28 . The cocondensation procedure also was used to prepare (Me 3 SnC 6 H 5 ) 2 Cr …”

Synergic Monodeprotonation of Bis(benzene)chromium by Using Mixed Alkali Metal–Magnesium Amide Bases and Structural Characterization of the Heterotrimetallic Products

“…The surprising and contrasting answers to this question when the π‐arene complex is subjected to synergic amide mixtures based on either 1,1,1,3,3,3‐hexamethyldisilazide (HMDS) or 2,2,6,6‐tetramethylpiperidide (TMP) provides the basis for this Communication. Moreover, all of the metal products synthesized in this study have been successfully characterized crystallographically, thus belatedly revealing the first crystal structures of polar metal complexes of bis(benzene)chromium 7…”