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An (iminoacyl)palladium complex ( 3a ) prepared from the reaction of methylpalladium complex 1a with o -((trimethylsilyl)ethynyl)phenyl isocyanide ( 2 ) undergoes an intramolecular insertion of acetylene at 45 °C in chloroform to give the (( E )-indolidenemethyl)palladium complex 4a quantitatively. The treatment of 3 with AgPF 6 followed by Et 4 NCl at room temperature causes smooth insertion of acetylene, giving the (( Z )-indolidenemethyl)palladium complex 5 as a main product.
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Onitsuka et al. (1998) studied this question.
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