Preparation and characterization of organoiridium cluster compounds from the reaction of dodecacarbonyltetrairidium with 1,5-cyclooctadiene. Crystal structure of Ir4(CO)5(C8H12)2(C8H10)

Dialing in single-site reactivity of a supported calixarene-protected tetrairidium cluster catalyst

“…Instead, nucleophilic attack of TMAO has been inferred to take place by transfer of oxygen lone pairs onto the carbon of the departing CO ligand, in a concerted fashion with O transfer from TMAO, via an SN 2 mechanism 69 , 70 This mechanism explains why selectivity for CO removal can be completely different from that in reactions requiring CO dissociation as the rate-limiting step, such as thermally driven decarbonylation with a sweep-gas treatment of supported 1 . 48 – 51 , 57 , 69 – 71 …”

Chemistry of tetrairidium carbonyl clusters. Part 1. Synthesis, chemical characterization, and nuclear magnetic resonance study of mono- and di-substituted phosphine derivatives. X-Ray crystal structure determination of the diaxial isomer of [Ir4(CO)7(µ-CO)3(Me2PCH2CH2PMe2)]

“…10 cm3 and cold methanol (60 cm3) was added to give a yellow precipitate. Recrystallization from dichloromethane-methanol gave the yellow compound [Ir,(CO),,(PPh,)] (1) (0.98 g, 93%) (Found: C , 26.1; H, 1.2. C,9Hl,Ir,011P requires C, 26.0; H, 1.1%).…”

Carbon–carbon coupling on tetrahedral iridium clusters: X-ray molecular structures and multinuclear NMR studies of the two isomeric forms of [Ir4(CO)6(μ3-η2-HCCPh)(μ2-η4-C4H2Ph2)(μ-PPh2)2]

“…Deuterated solvents were used as locks and references: 1 H relative to the proton resonance resulting from incomplete deuteration of the CDCl 3 (d 7.27), C 6 D 6 (d 7.16) or CD 2 Cl 2 (d 5.32); 13 C relative to the carbon of the CDCl 3 (d 77. 23) or CD 2 Cl 2 (d 54.00) and for 31 P, external 85% H 3 PO 4 .…”

“…The only reports in the literature involving iridium clusters describe the reactions of 0022-328X/$ -see front matter Ó 2004 Elsevier B.V. All rights reserved. doi:10.1016/j.jorganchem.2004.08.010 this tetranuclear cluster under thermolytic conditions with C 2 (COOMe) 2 , to yield [Ir 4 (CO) 8 {C 2 (COOMe) 2 } 4 ] [22], and with cod (cod = cyclooctadiene), to give the alkyne containing clusters [Ir 4 (CO) 5 (cod) 2 (C 8 H 10 )] and [Ir 7 -(CO) 12 (cod)(C 8 H 11 )(C 8 H 10 )] [23,24] all in very low yields, and that of the oxidation of [Ir 6 (CO) 15 ] 2À with ferrocinium in the presence of PhCCPh to yield [Ir 6 -(CO) 14 (l 3 -g 2 -HCCPh)] and [Ir 6 (CO) 12 (l 3 -g 2 -HCCPh) 2 ] [25]. The cluster [HIr 4 (CO) 10 (l-PPh 2 )] [26] has proven itself a good entry into tetranuclear iridium organometallic chemistry [27][28][29][30][31][32][33][34][35].…”