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Synthesis of Cyclophanic Chromium(0) Bis(carbene) Complexes

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journal contribution
posted on 18.09.2001, 00:00 by Israel Fernández, Miguel A. Sierra, María José Mancheño, Mar Gómez-Gallego, Susagna Ricart
Double Michael addition of 1,4- and 1,3-xylylene diamines and 1,5-diaminobutane to the bimetallic α,β-unsaturated alkoxychromium(0) carbene complex 4 produces in good to excellent yields the corresponding cyclophane bimetallic complexes 57 as single isomers. In contrast, the reaction with 1,4-diaminobutane produces a different cyclophane complex, 8, derived from a 1,2- + 1,4-addition process.