Some Palladium(ii) Complexes of 1,2-Bis(mercapto)orthocarborane

Platinum(II) and Palladium(II) Complexes of Chiral P−Cl Functionalized Bis-phosphino ortho-Carbaboranes

“…The platinum and the palladium atoms in the mononuclear complexes are coordinated in a slightly distorted square-planar fashion by the two phosphorus atoms of the carbaboranyl phosphine ligands and two chloro ligands in cis positions (Figures 1, 3, and 4). Thus, the metal atom exhibits a coordination number of four, which is preferred in platinum(II) ,, and palladium(II) , complexes. The coordination of the chelating carbaboranyl bis-phosphine ligand to the metal atom leads to the formation of a five-membered ring.…”

“…Several complexes of platinum and palladium with bidentate phosphine derivatives of dicarba- closo- dodecaborane(12) have been prepared, as well as several platinum complexes with unsymmetrical bis-phosphines, that is, cis -[PtCl 2 {1-PPh 2 -2-P(NMe 2 ) 2 (C 2 B 10 H 10 )}], cis -[PtCl 2 {1-PPh 2 -2-P(NMe 2 )F(C 2 B 10 H 10 )}], cis -[PtCl 2 {1-P(NMe 2 )F-2-P(NMe 2 ) 2 (C 2 B 10 H 10 )}], and cis -[PtCl 2 {1-PPh 2 -2-PF 2 (C 2 B 10 H 10 )}] . However, only a limited number of palladium complexes with functionalized phosphine ligands having reactive phosphorus−chlorine bonds, especially those with bidentate chlorophosphine ligands, have been reported .…”

“…However, only a limited number of palladium complexes with functionalized phosphine ligands having reactive phosphorus−chlorine bonds, especially those with bidentate chlorophosphine ligands, have been reported . So far only one palladium complex with a chlorophosphine derivative of dicarba- closo -dodecaborane(12) is known, whereas palladium complexes of bidentate carbaboranyl phosphine ligands without reactive phosphorus−halogen bonds have been extensively studied. , Only a limited number of complexes of the platinum group metals with chiral carbaboranyl phosphines have been prepared. , Chiral chlorophosphino derivatives of dicarba- closo -dodecaboranes(12) and transition metal complexes thereof are interesting because they are suitable starting materials for the synthesis of novel chiral phosphines by substitution of the chloro substituent and might be promising catalysts in asymmetric transformation.…”