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How many metal atoms can coordinate to a C[DOUBLE BOND]C unit? The answer for Co–Al clusters 1 (R = Me) and 2 (R = Et), the first η-η22-bridged dialumin-ioethene clusters, is “four”. The complexes are formed in about 30% yield on treatment of [Cp+2-ethene)2Co] (Cp+ = C5Me5, C5Me4Et) with AlEt2H.