Selective Hydrogenation of Aromatic Hydrocarbons Using a Triruthenium Carbonyl Cluster as a Template to Control the Hydrogenation Site: First Successful Isolation of 4,5-Dihydroacenaphthylene and 4,5-Dihydroaceanthrylene

摘要

It is well-known that η~6-coordination of arenes to organ-otransition metal species dramatically changes the chemical nature of the benzene ring, giving rise to the discovery of many fascinating new synthetic reactions of aromatic compounds. Typically, the complexation reduces the electron density of the π-electrons, leading to unusual nucleophilic substitution of arenes by a three-step process consisting of the eoraptexatioa, the reaction with riucleophiles, and oxidative removal of the metallic species. Several organometallic clusters in which arene ligands are bonded to dual metal atoms were recently synthesized and characterized by several groups including us. Since coordination to multimetallic centers Could affect the arene reactivity by affording an electronic nature and steric factors that are different From those observed in monometallic arene complexes, it is of keen interest that novel transformation of aromatic compounds may be possible via complexation to clusters. In this paper, wereport the first clear example of multimetallic coordination of aromatic compounds resulting in the successful synthesis of new aromatic compounds which had never been achieved by other methods.