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.
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