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A new preparation of imidazolidinylidene palladium(II) complexes by Yoshihiko Ito; Toshikazu Hirao; Kenji Tsubata; Takeo Saegusa is a Chemistry article available to read on EtoBox.

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In the preceding papers 1) we reported new synthetic methods of some nitrogen-containing heterocyclic compounds, in which diaminocarbene palladium(I1) complexes generated from amines and PdC12(RNC)2 may be involved as key intermediates. Here we wish to report the preparation of an imidazolidinylidene palladium(I1) complex (3\_) by the intramolecular cyclization of a diaminocarbene palladium(I1) complex (2) which is prepared by the reaction of o!-aminoacetal (or D(-aminoketal) (L) with PdC12(RNC)2. Pd(II)C12(RNC)2 1 NH2tHy(OC2H5)2 J R'R" 1 Cl, \_,,CNR $ /PdL /NHR Cl ':C -2C2H50H \NHfHf(OC2H5)2 2 R'R" (1) As shown in Table I, some diaminocarbene palladium(I1) complexes (2) were prepared by the reactions of c(-aminoacetals or ketal with PdC12(RNC)2 according to the reported procedure. 2) The structure of z2has been established by elemental analysis, IR, 3) NMR and molecular weight determination.3) Cyclization of the diaminocarbene palladium(I1) complexes (2) leading to the formation of imidazolidinylidene palladium(I1) complexes (2) was carried out as follows. A solution of 0.529 g (1 nol) of complex (2) and 0.344 g (2 mmol) of p-toluenesulfonic acid (or coned sulfuric acid (1 mmol))

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Author

Yoshihiko Ito; Toshikazu Hirao; Kenji Tsubata; Takeo Saegusa

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0040-4039)

Published

1978

Language

EN

Field

Chemistry (Physical Sciences)