Crystal structure of the quasitetrahedral iridium(I) complex, Ir(COCH2CMe3)[P(p-tolyl)3]2[C2(CO2Me)2]. An intermediate in cyclotrimerization of activated alkynes by 16-electron alkyl complexes of iridium, trans-RIr(CO)L2 [R = Me, CH2CMe3; L = PPh3, P(p-tolyl)3]

Abstract

The complexes (III) are cyclotrimerization catalysts for activated acetylenes such as (I) which produces the trimer (II).

(1,1,4,7,10,10-Hexaphenyl-1,4,7,10-tetraphosphadecane-P,P',P'',P''')hydridoplatinum(II) tetraphenylborate

“…However, in the case of the above non-planar arrangements steric effects, including the phenyl groups, also become important (Brown & Canning, 1984). Thus distorted trigonal-bipyramidal structures are typically involved if large groups are present (Rappoli, Churchill, Janik, Rees & Atwood, 1987). All intermolecular distances of the crystal structure of (1) are larger than the corresponding van der Waals radii and no packing effects are observed.…”

Structure of triaqua(N,N-dimethylformamide)trinitratoneodymium(III) monohydrate

“…Thus distorted trigonal-bipyramidal structures are typically involved if large groups are present (Rappoli, Churchill, Janik, Rees & Atwood, 1987). All intermolecular distances of the crystal structure of (1) are larger than the corresponding van der Waals radii and no packing effects are observed.…”

P-Fluorous Phosphines as Electron-Poor/Fluorous Hybrid Functional Ligands for Precious Metal Catalysts: Synthesis of Rh(I), Ir(I), Pt(II), and Au(I) Complexes Bearing P-Fluorous Phosphine Ligands

“…Vaskatype complexes [27], such as IrCl(CO)(PR3)2, are well-known iridium-phosphine complexes. We examined the preparation of a Vaska-type complex of P-perfluoroalkylated phosphine from IrCl3·3H2O and an excess amount of Ph2P n C10F21 via a reduction process [28,29]. As a result, IrCl(CO)(Ph2P n C10F21)2 (4a) was successfully obtained (Equation (5) The infrared CO stretching frequency (ν (CO) ) of the RhCl(CO)(PR 3 ) 2 complex provides information on the electronic properties of the phosphines [26].…”