Study on Synthesis and Properties of Functional Material Poly [Sila (N-Substituted) Imine]

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Palladium-catalyzed insertion reactions of isocyanides into silicon-silicon linkage of oligosilanes have been studied. A variety of disilanes reacted with aliphatic and aromatic isocyanides in the presence of palladium (O) tetrakis (triphenylphosphine) complex or palladium (II) acetate to give the corresponding bis (silyl) N-substituted imines in moderate yields. Oligosilanes were reacted with an excess of 2, 6-disubstituted aryl isocyanide in the presence of palladium (II) acetate, resulting in regular insertion of the isocyanide into each silicon-silicon linkage giving poly (silaimine) derivatives. The palladium catalyzed regular insertion was successfully achieved with up to hexasilane. Partial insertion of the isocyanide into oligosilanes was also achieved selectively by use of the limiting amount of isocyanide. New skeletal rearrangement of tetrasilanes was found in the palladium catalyzed reaction of tetrasilanes with one molar equivalent of 2, 6-disubstituted phenyl isocyanide to afford 2, 4-disila-3, 3-bis (silyl)-1-azacyclobutane derivatives, which was properly reconstituted from four fragments of tetrasilane and two fragments of isocyanide. Noteworthy is that the skeletal rearrangement was assisted by tert-alkyl isocyanide ligand on palladium catalyst.