Platinum (II) and palladium (II) 1,3,5-triaza-7-phosphaadamantane (PTA) complexes as intramolecular hydroamination catalysts in aqueous and organic media

1,3,5-Triaza-7-phosphaadamantane (PTA) ligated iridium(I) complexes as catalysts for the intramolecular hydroamination of 4-pentyn-1-amine in water

“…Though the turnover numbers were not exceedingly high, they were comparable to those previously observed for the Pt(II) catalyzed reaction (N t = 0.3 h À1 ) [6], but slower than the Pd(II) mediated processes (N t = 6 h À1 ) [7]. The three compounds catalyzed the cyclization to the same degree, within experimental error.…”

“…We have recently reported that PTA-ligated (PTA = 1,3,5-triaza-7-phosphaadamantane) Pt(II) [6] and Pd(II) [7] complexes function as catalysts for the intramolecular hydroamination of terminal alkynylamines in water. The hydroamination reaction is environmentally and economically important in that it is a 100% atom efficient process [8] for catalytically preparing higher substituted amines that are important intermediates for the production of polymers, natural products, solvents, and surfactants [9].…”

“…1 H NMR was used to follow the catalysis by monitoring particular substrate and product signals [22]. The substrate peak area ratio was plotted versus time, and as has been observed for the Pd(II) and Pt(II) catalyzed reaction, the data was best fit as a third-order polynomial suggesting that the reaction was solvent inhibited [6,7]. Turnover frequency (N t ) and percent conversion data were collected from these plots, and this information is listed in Table 3.…”

Selective recovery of palladium using an innovative functional polymer containing phosphine oxide

“…For instance, tri-n-octylphosphine oxide (TOPO) is not only used in solvent extraction procedures in the recovery of PGM [24][25][26], but also for the selective removal of PGM from acidic media [27]. Water soluble aminophosphines are excellent ligands [28][29][30][31][32][33] used in various homogeneous catalysts. The oxidized form of the excellent phosphine ligand 1,3,5-Triaza-7-phosphaadamantane (PTA), PTA=O, displays weaker ligation properties, but higher selectivity toward PGM than PTA.…”

Facile alternative route to cis -[PtCl 2 (PTA) 2 ] and [PtCl(PTA) 3 ]Cl (PTA = 1,3,5-triaza-7-phosphaadamantane)

“…Up to date, complexes of PTA with various metal centers were prepared [6][7][8], and the corresponding platinum derivatives attracted the attention of researchers due to high catalytic activity exhibited. In particular, complexes of the type cis-[PtX 2 (PTA) 2 ] (X = Cl, Br, I) were employed as efficient catalysts for the aqueous intramolecular hydroamination in water [12,13]. In addition to its catalytic use, interest in this ligand stems from the possible medical applications of its hydrophilic complexes [14,15].…”