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(Silyl)palladium(IV) species are considered to be key intermediates in a number of palladium complex catalyzed reactions of organosilicon compounds. However, no unequivocal evidence that substantiates (silyl)palladium(IV) species has been reported to date.
1,2-Disilylbenzene 1 smoothly reacted with dimethylpalladium(II) complex 2 in toluene at room temperature to give bis(silyl)palladium(II) complex 3 in 74% yield, while the reaction of 1 with 1,2-bis(dimethylphosphino)ethane complex 4 at 50 slowly proceeded to form tetrakis(silyl)palladium(IV) complex 5, which is a first example of (silyl)palladium(IV) complex, in 67% yield. The same complex 5 was obtained quantitatively by the reaction of 1 with dimeric bis(silyl)palladium(II) complex 6, which was prepared from 3 by the phosphine exchange reaction. The structures of complexes 3, 5 and 6 were confirmed by single crystal X-ray analysis.
