文摘
The rate of insertion of methyl-substitutedallenes into the Pd-Me bond in chelate pyridine-thioether complexes [PdCl(Me)(R'N-SR)] (R'N-SR = 6-R'-C5H3N-2-CH2SR) to give 2-methylallyl derivatives isremarkably enhanced by the presence of a methyl groupin position 6 of the pyridine ring, which induces distortion on the main coordination plane, resulting in a metalsubstrate more prone to allene insertion. The flexibilityof the sulfur-donor chelate ligand appears to be aparamount requisite.