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A series of (q6-arene) (q4-cyclo-octa-1 ,5-diene)ruthenium(O) complexes have been readily prepared by reaction of (q4-cyclo-octa-l ,5-diene) (q6-cyclo-octa-l ,3,5-triene)ruthenium(o) with arene compounds, under 1 atm C6H5, CsH5C6H5, C2H5CH(Me)C6H5, MepCHCH(Me)C6H5, NH2CH(Me)C6H5, CH30C6H5, or CH3COC6H5]. These complexes react with aqueous HCI to give in almost quantitative yield the corresponding (q6-arene)dichlororuthenium(l1) complexes.

Rhodium-catalyzed deuterioformylation of 1-hexene, at partial substrate conversion, has been investigated at different temperatures and pressures, and the incorporation of deuterium in the residual substrate has been detected by MS and 2H NMR analyses. At room temperature, 1-hexene does not isomerize to internal olefins nor is deuterium present in the residual 1-hexene. At high temperature, 1-hexene incorporates deuterium mainly at carbon atom Cz and isomerization to 2-hexene, nondeuterated or deuterated at carbon atom C1, occurs. These findings indicate that the formation of alkylrhodium intermediates is not reversible at room temperature. A t high temperature a &hydride elimination process occurs to an extent which is greater for the branched than for the linear alkyl accounting for the influence of the reaction parameters on the regio-and chemoselectivity of the reaction.