By Friend J.N. (ed.)

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9). The alkylation of phenyl 3-pyridyl ketone using (8) Activation of Inert C–H Bonds 51 RuH2(CO)(PPh3)3 as a catalyst proceeds exclusively at the pyridine ring (Eq. 10) [28]. This result indicates that C–C bond formation preferentially takes place at the electron-deficient aromatic ring. Chaudret et al. [29] prepared a reactive ruthenium complex, RuH2(H2)(CO)(PCy3)2, where Cy is cyclohexyl, and examined the catalytic activity of this complex in the reaction of benzophenone with ethylene (Eq. 11).

4 Reaction of Aromatic Compounds Addition to Olefins . . . . . Addition to Acetylenes . . . . Arylation . . . . . . . Silylation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 . . . 47 47 60 61 62 3 Addition of Olefinic and Aliphatic C–H Bonds to C–C Multiple Bonds . . 1 Addition to Olefins .

72) Recently, a formal ruthenium-catalyzed [4+2+2] cycloaddition of 1,6-diynes to 1,3-dienes gave conjugated 1,3,5-cyclooctatrienes and vinylcyclohexadienes [94] (Eq. 73). Insertion of a double bond in the ruthenacyclopentadiene can lead to the formation of tetraenes or vinyltrienes which undergo a thermal electrocyclization. Ruthenium-Catalyzed C–C Bond Formation 31 (73) When the [2+2+2] cycloaddition of 1,6-diynes occurred in the presence of CϵC bonds or CϵN bonds, substituted benzenes or pyridines were obtained in good yields [95–98].

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A Textbook of Inorganic Chemistry by Friend J.N. (ed.)


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