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Interestingly, the reactivity of chelated substrates was shown by NMR not to be important, even in the presence of a significant excess of diazo ester (up to 4 times the stoichiometric amount). When MDA is added to a solution of T)3-allylpalladium chloride dimer, PdCl2-COD, or [RhCl(NBD)]2, the signals of the ligands are not modified unless a large excess of MDA is used. Moreover, the last two catalysts decompose the diazo compound at very different rates. PdClyCOD is practically inactive at-10 °C whereas the rhodium complex promotes the decomposition at-40 °C, although forming only methyl maleate and fumarate and polycarbalkoxycarbenes, even in the presence of olefins.
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