Ad
related to: rhodium methanolic solution
Search results
Results From The WOW.Com Content Network
Heating a methanolic solution of hydrated rhodium trichloride with sodium acetate give the blue-green rhodium(II) acetate, Rh 2 (O 2 CCH 3) 4, which features a Rh-Rh bond. This complex and related rhodium(II) trifluoroacetate have attracted attention as catalysts for cyclopropanation reactions.
This complex was first prepared from hexamethyl Dewar benzene and RhCl 3 (H 2 O) 3. [3] [4] [5] The hydrohalic acid necessary for the ring-contraction rearrangement is generated in situ in methanolic solutions of the rhodium salt, and the second step has been carried out separately, confirming this mechanistic description. [6]
Chlorobis(ethylene)rhodium dimer is an organorhodium compound with the formula Rh 2 Cl 2 (C 2 H 4) 4. It is a red-orange solid that is soluble in nonpolar organic solvents. The molecule consists of two bridging chloride ligands and four ethylene ligands. The ethylene ligands are labile and readily displaced even by other alkenes.
Organorhodium chemistry is the chemistry of organometallic compounds containing a rhodium-carbon chemical bond, and the study of rhodium and rhodium compounds as catalysts in organic reactions. [ 1 ] Stable organorhodium compounds and transient organorhodium intermediates are used as catalyst such as in olefin hydroformylation , olefin ...
Wilkinson's catalyst (chloridotris(triphenylphosphine)rhodium(I)) is a coordination complex of rhodium with the formula [RhCl(PPh 3)], where 'Ph' denotes a phenyl group. It is a red-brown colored solid that is soluble in hydrocarbon solvents such as benzene, and more so in tetrahydrofuran or chlorinated solvents such as dichloromethane .
Thus, ethanolic solutions of hydrated rhodium trichloride react with diethyl sulfide: [11] "RhCl 3 (H 2 O) 3" + 3 S(C 2 H 5) 2 → RhCl 3 (S(C 2 H 5) 2) 3 + 3H 2 O. This complex has been used as source of anhydrous rhodium trichloride that is soluble in lipophilic solvents. Both fac and mer stereoisomers of such complexes have been isolated. [3]
Cotton and Wilkinson demonstrated [11] that the 18-valence electron rhodium(III) rhodocenium cation [Rh(η 5-C 5 H 5) 2] + can be reduced in aqueous solution to the monomeric form; they were unable to isolate the neutral product as not only can it dimerise, the rhodium(II) radical monomer can also spontaneously form the mixed-hapticity stable ...
Because of their relevance to hydroformylation catalysis, rhodium carbonyls have been systematically studied to a high degree. The instability of Rh 2 (CO) 8 has been a source of curiosity. The analogous binary carbonyl of cobalt, Co 2 (CO) 8, is well known. Solutions of Rh 4 (CO) 12 under high pressures of CO convert to the dirhodium compound: [5]