New optically active amido-phosphinite ligand and ruthenium complexes

Synthesis and characterisation of new pyrazole–phosphinite ligands and their ruthenium(II) arene complexes

“…The signal corresponding to the CH 2 link of complex 1 is observed at 73.9 ppm, whereas the signals of the CH 2 CH 2 fragment are found at: (a) 65.8 ppm (OCH 2 ) and 48.9 ppm (CH 2 Pz) for complex 2, and (b) 66.3 ppm (OCH 2 ) and 48.9 ppm (CH 2 Pz) for complex 3. Regarding 31 P{ 1 H} NMR spectra, singlets at 112.0, 114.1 and 114.1 ppm are found for complexes 1, 2 and 3, respectively, which are in the expected range for coordinated phenylphosphinite ligands [7,30,38,39]. All these data are in agreement with [RuCl 2 -(g 6 -arene)(j 1 -P-pyrazole-phosphinite)] type structures for compounds 1-3.…”

“…Concerning the 31 P{ 1 H} NMR spectra of complexes 4 and 5, expected singlets at 114.1 and 111.9 ppm are observed. It is significant to remark that 31 P NMR signals of ligands and complexes do not differ significantly [38,39].…”

trans- and cis-Ru(II) aminophosphine complexes: Syntheses, X-ray structures and catalytic activity in transfer hydrogenation of acetophenone derivatives

“…The IR bands observed at 993 and 1436 cm À1 represent m(PNP) and m(PPh), respectively. The 13 C NMR spectra gave signals in line with structures as explained in Section 2 [43]. Scheme 2.…”

New chiral phosphinite ligands with C2‐symmetric axis and their possible applications in Ru‐catalyzed asymmetric transfer hydrogenation

“…[49,50] In the compounds 3 and 4, the coupling between i-carbons and the phosphorus is relatively large, 1 J(PC) 42.4 and 50.3 Hz, while the coupling between o-carbon and the phosphorus relatively small 2 J(PC) 11.1 and 11.0 Hz, respectively. The most relevant signals of 13 C-{ 1 H} NMR spectra of complexes 3 and 4 are those corresponding to arene ligands (p-cymene).…”