Abstract
The polydendate bis(phosphino)amine, tris{2-( N, N-bis(diphenylphosphino)aminoethyl}amine 1 has been prepared in a single step from the reaction of tris(2-aminoethyl)amine with six equivalents of PPh 2Cl in the presence of NEt 3 in THF. Oxidation of 1 with aqueous H 2O 2, elemental sulfur or grey selenium gave the corresponding oxide, sulfide or selenide derivatives. [{(P(E)Ph 2) 2NCH 2CH 2} 3N] (E: 2a O, 2b S, 2c Se), respectively. Reaction of [{(PPh 2) 2NCH 2CH 2} 3N] with 3 equiv. of PdCl 2(cod) or PtCl 2(cod) gave the corresponding chelate complexes, [Pd 3Cl 6 1] or [Pt 3Cl 6 1]. The new compounds were fully characterized by NMR, IR spectroscopy and elemental analysis. The catalytic activity of the Pd(II) complex was tested in the Suzuki coupling and Heck reactions. The Pd(II) complex catalyzed the Suzuki coupling and Heck reaction affording biphenyls and stilbenes, respectively, in high yields.
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