Metals Intercalated in Graphite. I. Reduction and Oxidation

Abstract

Potassium in graphite shows distinctive reducing properties towards carbonyls. The reaction products can be related to a mechanism similar to electrochemical reduction. The steric orientation of the reduction can be explained by the particular structure of potassium-graphite.Chromic anhydride in graphite offers a new selective method of preparation of aldehydes from the corresponding primary alcohol. This method is characterized by its specificity, high yields and a simple experimental procedure.Le potassium insert dans le graphite presente des proprietes rtductrices particulieres. Les produits de reduction peuvent &tre expliques par un mecanisme de type electrochimique. La stkrkochimie de la reduction s'explique par la structure du potassium-graphite.L'anhydride chromique insere dans le graphite offre une nouvelle methode d'oxydation selective des alcools primaires en aldehydes. Cette methode est caracttrisee par sa specificite et la simplicite des operations.

Maximizing Electron Exchange in a [Fe3] Cluster

“…18-crown-6 (18-C-6) and [2.2.2]cryptand (crypt-222) were purchased from Sigma-Aldrich and dried by dissolving in diethyl ether and storing over sieves for several days, followed by removal of the sieves and solvent. tbs LH6, 1 ( tbs L)Fe 3 (thf) (see Supporting Information), and potassium graphite (KC 8 ) 17 were prepared according to literature procedures. All other reagents were purchased from commercial vendors and used without further purification.…”

[IrCl{N(CHCHPtBu2)2}]−: a versatile source of the IrI(PNP) pincer platform

“…Complex 2, Na/Hg and KC 8 were prepared according to published procedures. 14,41,42 Elemental analyses were obtained from the Analytical Laboratories at Friedrich-Alexander-University and Georg-August-University, respectively. IR spectra were recorded as nujol mulls between KBr disks using a JASCO FT/ IR 4100 Spectrometer.…”

Chromium Oxidations in Organic Chemistry

“…It has been found that a chromic acid on graphite -supposedly an intercalated compound -prepared by heating a mixture of chromic anhydride with graphite under reduced pressure, may act as a specific oxidant for primary alcohols [215]. Table 48 summarizes a choice of feasible reactions [215]. Yields are generally good, even with sensitive structures such as terpenes or allylic systems.…”