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The activation of the C-H bond promoted by transition metal complexes is an active area of research. 1 The cleavage of the C-H bond in aldehydes is involved in many stoichiometric and catalytic reactions such as decarbonylation or hydroacylation reactions, where subsequent C-C bond rupture or new C-C bond formation also occurs. 1,2 Metal complexes containing olefins may activate the aldehyde C-H bond to undergo oxidative addition and olefin insertion into the M-H bond. Rearrangements and new C-C bond formation may also occur to afford a variety of acylallyl or acylalkyl derivatives and even unsaturated or saturated ketones. 3 Norbornadiene rhodium(I) complexes have been reported to react with o-(diphenylphosphine)benzaldehyde to undergo the chelate-assisted oxidative addition of aldehyde followed by hydrogen transfer to norbornadiene, giving selectively, by using the appropriate reaction conditions, nortricyclylrhodium(III) complexes or σ-norbornenylrhodium(III) derivatives with a noncoordinating

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