Rhodium III chloride

Synthesis. The most important starting material for rhodium compounds is rhodium(III) chloride hydrate [20765-98-4], RhCl3 nH2 O. Other commercially available starting materials useful for laboratory-scale synthesis include [Rh2(0000113)4] [5503-41 -3], [Rh(NH3)201]0l2 [13820-95-6], [Rh20l2(0O)4] [32408-34-7], and [Rh20l2(cod)2] [12092-47-6]. 

Rhodium (III) chloride [10049-07-7] M 209.3, m >100°(dec), b 717°. Probable impurities are KCl and HCl. Wash solid well with small volumes of H2O to remove excess KCl and KOH and dissolve in the minimum volume of cone HCl. Evaporate to dryness on a steam bath to give wine-red coloured RhCl3.3H20. Leave on the steam bath until odour of HCl is lost - do not try to dry further as it begins to decompose above 100° to the oxide and HCL. It is not soluble in H2O but soluble in alkalis or CN solns and forms double salts with alkali chlorides. [Inorg Synth 7 214 1063.]... 

A 500-ml rcund-bottom flask is equipped with a reflux condenser, a gas inlet tube, and a gas outlet leading to a bubbler. The flask is charged with a solution of rhodium (III) chloride trihydrate (2 g) in 70 ml of 95 % ethanol. A solution of triphenylphosphine (12 g, freshly recrystallized from ethanol to remove the oxide) in 350 ml of hot ethanol is added to the flask, and the system is flushed with nitrogen. The mixture is refluxed for 2 hours, following which the hot solution is filtered by suction to obtain the product. The crystalline residue is washed with several small portions of anhydrous ether (50 ml total) affording the deep red crystalline product in about 85% yield. 

SO the Sgl mechanism and not the usual arenium ion mechanism is operating. Aromatic rings can also be deuterated by treatment with D2O and a rhodium(III) chloride or platinum catalyst or with CeDs and an alkylaluminum dichloride catalyst," though rearrangements may take place during the latter procedure. Tritium ( H, abbreviated T) can be introduced by treatment with T2O and an alkylaluminum dichloride catalyst. " Tritiation at specific sites (e.g., >90% para in... 

Catalysts for hydrogenation can be also supported on ion exchange resins. For example, rhodium(III) chloride, attached to a 3-carboxy-butenolic acid/DVB cation exchange resin with... 

Rhodium(III) chloride trihydrate (2 g.) is dissolved in 70 ml. of ethanol (95%) in a 500-ml. round-bottomed flask fitted with gas inlet tube, reflux condenser, and gas exit bubbler. A solution of 12 g. of triphenylphosphine (freshly crystallized from ethanol to remove triphenylphosphine oxide) in 350 ml. of hot ethanol is added and the flask purged with nitrogen. The solution is refluxed for about 2 hours, and the crystalline product which forms is collected from the hot solution on a Buchner funnel or sintered-glass filter. The product is washed with small portions of 50 ml. of anhydrous ether yield 6.25 g. (88% based on Rh). This crystalline product is deep red in color. 

To a solution of 2 g. of rhodium(III) chloride trihydrate in 70 ml. of ethanol is added 12 g. of triphenylphosphine in 250 ml. of hot ethanol. After refluxing until the red solution begins to lighten in color (about 5 minutes), 8 g. of lithium bromide dissolved in 50 ml. of hot ethanol is added and the mixture refluxed for an hour. The orange prisms of the complex are collected by filtration, washed with 50 ml. of anhydrous ether, and dried in vacuum yield 5.1 g. (64% based on rhodium). 

Rhenium tetrachloride oxide, 4167 Rhodium(III) chloride, 4155 Rhodium tetrafluoride, 4349 Ruthenium(III) chloride, 4156 Silver chloride, 0008... 

A series of water-soluble polyether-substituted triphenyl phosphines (PETPPs) la-c has been successfully employed by Jin et al. [11] in the thermoregulated hydroformylation of 1-dodecene in the biphasic water/toluene system. The catalysts exhibit very good catalytic properties with conversions up to 93% and about 85% selectivity for aldehyde formation. The catalyst derived from rhodium(III) chloride and ligand Ic could be reused in four consecutive cycles without significant loss of activity or chemoselectivity. The n-selectivity of the product aldehydes was not determined. 

Formula RhCE MW 209.26 forms a trihydrate RhCl3 3H20 Synonyms rhodium trichloride rhodium(III) chloride... 

There is evidence that an unstable complex is formed when rhodium(III) chloride is treated with ethylene at high pressure (97). 

Reduction of rhodium(III) chloride in methanol- 549 water, in the presence of the polymer, led to 30-70 A Rh particles... 

Catalytic hydrogenation is an obvious method for the conversion of cyclobutenes into cyclobutanes. Thus, hydrogenation of a solution of unstable spiro[3.4]octa-l,5,7-triene in pentane at — 40 °C over rhodium [prepared in situ from rhodium(III) chloride by reduction with sodium borohydride24] gave spiro[3.4]octane (9) as the major volatile product in over 90% yield.14... 

III,C, isomerization often accompanies hydroformylation. It has, however, been found that [(PhCN)2PdCl2] absorbed onto silica gel is 100 times more active for the isomerization of a-olefins, such as 1-heptene, than is the same complex alone (116). This implies some specific role for the silica gel. Attempts to use rhodium(III) chloride absorbed onto silica gel, alumina, activated charcoal, and diatomaceous earth as a-olefin isomerization catalysts showed that all these catalysts were unstable even at room temperature (100). 

No report involving incorporation of rhodium into a quadruple bond has been published. For the sake of completeness the dimeric rhodium carboxylates are noted here. The Rh2(02CCH3)4 dimer can be conveniently synthesized from rhodium(III) chloride and sodium acetate (215), although routes from... 

A 200-mL, round-bottomed flask, equipped with a magnetic stir bar, is charged with 1.00 g (3.80 mmol) of rhodium(III) chloride trihydrate (Johnson... 

In a 100-ml., three-necked, round-bottomed flask, 2 g. (7.7 mmoles) of rhodium(III) chloride 3-hydrate is dissolved in an oxygen-free mixture of 40 ml. of 2-propanol and 10 ml. of water. Cyclooctene (6 ml.) is added. The solution is stirred for about 15 minutes under nitrogen. The flask is then closed and allowed to stand at room temperature for 5 days. The resulting reddish-brown crystals are collected on a filter, washed with ethanol, dried under vacuum, and stored under nitrogen at —5°C. The yield is 2.0 g. (74%). Anal. Calcd. for RhC16H28Cl Rh, 28.72 C, 53.56 H, 7.81 Cl, 9.91. Found Rh, 28.55 C, 53.76 H, 7.89 Cl, 9.76. 

RESORCINOLS 1, 3-Bis(trimethylsiIyloxy)-1 -methoxy-1,3-butadiene. Rhodium(III) chloride. 

Reformatsky reaction, 511, 599 Reissert compounds, 150 Resistomycin, 450 Resorcinols, 66, 460-461 Retinal, 120 Retrolactonization, 17 Rhodium(ll) carboxylates, 458-460 Rhodium catalysts, 460 Rhodium(III) chloride, 460-461 Rhodium(III) porphyrins, 461-462 Rifamyem S, 133, 134 Ruthenium(III) chloride, 462 Ruthenium tetroxide, 462-463... 

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