silenziox
(Stranger) 10-27-03 01:43 No 466925 |
GBL via THF (exotic ruthenium reagent) | |||||||
What the hell is "trans-<Ru%VI&(N,N'-dimethyl-N,N <A href="../rhodium /thf2gbl
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Chromic (Synaptic Self-Mutilator) 10-27-03 04:03 No 466939 |
Exotic ruthenium agent | |||||||
I think it's ruthenium(IV) oxide with a substituted propylenediamine ligand chelated to it. (this is a polydentate ligand, coordinating with its 4 nitrogens) I wonder what that <ClO4>2 part is about, it seems to indicate two perchlorate groups, but I have no idea how that would fit in.. perhaps its a bridging ligand (but how would the charge balance?) I'm just guessing here, but I think one would have to prepare this compound--not purchase it. Unless you've got access to Sigma/Fischer/Aldrich, and a fair amount of money to spend on ruthenium salts (they're not terribly expensive--but not terribly cheap either)... don't even bother thinking twice about this reagent... and if you did have such access, you'd just buy a drum or twelve of GBL anyhow. |
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Rhodium (Chief Bee) 10-27-03 21:39 No 467073 |
Valence note | |||||||
The name actually says Ru6+ (and not Ru4+), so all the ligands would actually "fit". |
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Chromic (Synaptic Self-Mutilator) 10-28-03 00:01 No 467115 |
Dylexic | |||||||
RuO2(ClO4)2 with the substituted diamine coordinated to it makes sense if the ruthenium is 6+... Rhodium is absolutely right. Sorry about my dyslexia. |
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Rhodium (Chief Bee) 09-21-04 21:45 No 532546 |
Oxidation of THF to GBL in 98% yield with Ru(VI) (Rated as: good read) |
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Full text to the above-mentioned article: Synthesis, Electrochemistry, and Reactivities of trans-[Ru(L)O2]2+ (L = N,N'-dimethyl-N,N'-bis(2-pyridylmethyl)propylenediamine Chi-Ming Che, Wai-Tong Tang, and Chi-Keung Li J. Chem. Soc. Dalton Trans 3735-3739 (1990) (../rhodium/pdf /thf2gbl.ruo2 Abstract The synthesis and characterization of the ligand N,N'-dimethyl-N,N'-bis(2-pyridylmethyl)propylenediamine (L) and the complex trans-[Ru(L)O2]2+ are described. The complex has been characterized by uv-visible [dxy → dπ* (dπ* = dxz,dyz) at 380-420 nm] and IR [Vasym(RuO2) at 860 cm-1] spectroscopy. At pH 1.0 it exhibits three reversible couples RuVI-RuIV RuIV-RuIII, and RuIII-RuII at potentials of 0.89, 0.60, and 0.28 V respectively vs. saturated calomel electrode. The RuVI-RuIV couple splits into two reversible one-electron couples RuVI-RuV and RuV-RuIV in alkaline solutions (pH > 9). The complex is a powerful oxidant, capable of oxidizing toluene to benzaldehyde, alcohols to aldehydes/ketones, tetrahydrofuran to γ-butyrolactone, and norbornene to exo-2,3-epoxy-norbornane in high yields at room temperature. Oxidation of cis- and trans-stilbenes gave benzaldehyde and trans-stilbene oxides. The Hive - Clandestine Chemists Without Borders |
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