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Early transition metal catalysts [N,N]MCln, in which [N,N] is N-(2,6-diisopropylphenyl)pyridine-2-carboxaldimine (C18H22N2, NN-1), N-(2,6-diisopropylphenyl)-6-methylpyridine-2-carboxaldimine (C19H24N2, NN-2), N-(2,4,6-trimethylphenyl)pyridine-2-carboxaldi