Dicarbonyltris(.eta.2-trans-cyclooctene)ruthenium. Synthesis and molecular structure of the first stable M(CO)2(olefin)3 type compound

Complexes of Ruthenium and Osmium Containing η2–η6 Hydrocarbon Ligands: (i) Complexes not Containing Cyclobutadiene, Cyclopentadienyl or η-Arene Coligands

“…The uncomplexed conjugated diene in the complexes is more reactive towards Diels-Alder addition with dimethyl acetylenedicarboxylate than it is in the f r e e hydrocarbon. 13 The thermal reaction of 7,7-dimethoxy-5,6-dimethylenebicyclo[2.2.1]hept-2-ene with [Ru(CO) 3 (l,5-cod)] under CO is reported to give, among other products, a n exo-[R\x (CO) 4 ] complex, but in the light o f related iron chemistry, it seems more likely to be the chelate [O, rj 2 ] tricarbonyl complex (7). 14 14 and [M(CO) 4 (TJ-C 2 H 2 )] 15 are higher for osmium than for ruthenium, consistent with IR, NMR and chemical evidence for a stronger metal-ligand interaction with the heavier element, and are also greater for the alkyne complexes than for the C 2 H 4 complexes.…”

“…41 The latter process is also catalysed by hydrated RuCl 3 , OsCl 3 43 propene, 43 styrene, 44 t| 2 -butadiene, 43 T| 2 -l,4-pentadiene, 43 t| 2 -l,5-nexadiene 43 and 1,3-dimethyluracil 45 ). The styrene complexes were isolated as PF 6 salts, but in most cases the complexes were identified by their NMR spectra and by cyclic voltammetry.…”

“…108 12 ] to give exo-and erafo-Ru(CO) 3 complexes (36) and (37); surprisingly, the pentaene does not displace cod f r o m [Ru(CO) 3 (t|-cod)]. Dinuclear complexes of the pentaene containing both Fe(CO) 3 and Ru(CO) 3 groups have also been prepared. 109 The photoelectron spectra o f corresponding exo-and endo-isomers show considerable differences, and a theoretical interpretation has been offered.…”

“…The exo-coordinated complex [Ru(CO) 3 {ri-(CH 2 ) 2 C 6 H 4 }] is formed as colourless crystals in unspecified yield from the reaction o f Na 2 [Ru(CO) 4 ] in liquid ammonia with 1,2-bis(bromomethyl)-benzene. 14 A general procedure for the preparation of the corresponding tris(tertiary phosphine)ruthenium(O) complexes is the reaction of [RuCl 2 (PR 3 ) 4 ] with a Grignard or lithium reagent derived from a 1,2-dimethylarene.…”

“…Complexes containing methyl-substituted o-quinodimethanes, 1,2-naphthoquinodimethane, and its 2,3-isomer have been made similarly. A complementary method for preparing [Ru(L) 3 (o-quinodimethane)] is the deprotonation of cationic 1,2-dimethylarene bis(tertiary phosphine)ruthenium(II) complexes (see 3 …”