Zeitschrift fur Naturforschung, B: Chemical Sciences p. 934 - 946 (1996)
Update date:2022-08-02
Topics:
Pitter, Stephan
Dinjus, Eckhard
Jung, Beate
Go?rls, Helmar
Phosphinoalkylnitriles R2P-(CH2)n-CN {R = isopropyl (ipr), phenyl (ph), cyclohexyl (chex), n = 3, 6, 10} have been prepared starting from the corresponding secondary phosphines in an easy three step synthesis. All new compounds were characterized by their 1H-, 13C and 31P NMR data. Some of these new P, N ligands were used to prepare complexes [{R2P-(CH2)n-CN}2PdCl2] which were also identified by their NMR data. In addition the crystal structures of three derivatives, [{ipr2P-(CH2)3-CN} 2PdCl2] 7a, [{ph2P-(CH2)3-CN}2PdCl2] 7b and [{ph2P-(CH2)6-CN}2PdCl2] 8b were determined by X-ray analysis. The coordination mode of the phosphinoalkylnitriles in these complexes was found to be P-bonded resulting in a trans configuration. Palladium catalysts with 5a as ligund show high activies in the co-oligomerization of butadiene and carbon dioxide. The δ-lactone 11a is formed under very mild conditions.
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