Heads you win: An unusual head‐to‐head dimerization of styrenes has been developed using the zero‐valent ruthenium catalyst [Ru(η6‐cot)(η2‐dmfm)2] (cot=1,3,5‐cyclooctatriene, dmfm=dimethyl fumarate) in the presence of primary alcohols to give the homo‐dimer in high regio‐ and stereoselectivity. The catalyst system is also effective for the selective co‐dimerization of styrenes with ethylene to give the co‐dimer in high yield.
Kopf gewinnt: Eine ungewöhnliche Kopf‐Kopf‐Dimerisierung von Styrolen gelingt mit dem nullwertigen Rutheniumkatalysator [Ru(η6‐cot)(η2‐dmfm)2] (cot=1,3,5‐Cyclooctatrien, dmfm=Dimethylfumarat) in Gegenwart primärer Alkohole; dabei entsteht das Homodimer mit hoher Regio‐ und Stereoselektivität. Das Katalysatorsystem eignet sich auch für die selektive Codimerisierung von Styrolen mit Ethen in hoher Ausbeute.
A (μ-oxo)tetraruthenium cluster showed high catalytic activity for a simple and practical aerobic oxidation of alcohols to aldehydes and ketones under 1 atm of O 2 or air. After the reaction, this cluster catalyst was recovered from the reaction mixture, and we believe that this (μ-oxo)tetraruthenium cluster acts as an active catalytic species throughout the reaction.
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