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Die α‐Methylierung von Ketonen wird in der Zuschrift von T. J. Donohoe et al. auf S. 780 ff. beschrieben. Die Umsetzung einer Carbonylverbindung mit einer Base, einer katalytischen Menge Rhodium und Methanol als Kohlenstoffquelle in einer Sauerstoffatmosphäre führt bei 65 °C zur Alkylierung. Mit einer Kombination aus Iridium‐ und Rhodiumkatalysator wird ein doppelter Alkylierungszyklus möglich, der...
The rhodium‐catalyzed methylation of ketones has been accomplished using methanol as the methylating agent and the hydrogen‐borrowing method. The sequence is notable for the relatively low temperatures that are required and for the ability of the reaction system to form α‐branched products with ease. Doubly alkylated ketones can be prepared from methyl ketones and two different alcohols by using a...
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