Niobium benzene

C32H32Nb02 0,5 CgHg, Dicyclopentadienyl-(diphenylacetylene)-pivaloyl-niobium benzene solvate, 45B, 918 C32H3nCl302PPt, Tetraphenylphosphonium trichloro-(2,5-dimethylhex-3-yne-2,5-diol)platinate(II), 39B, 599 C3 2HgoNiP2 f Tetramethylethylene-1,2-bis(dicyclohexylphosphino)eth-anenickel, 40B, 735... 

Using an electron-gun source, tungsten atoms were reacted with benzene, toluene, or mesitylene at 77 K, to form the expected (arene)2W complex (42) in a yield of 30%, compared with the —2% yield from the previously published, bis(benzene)W synthesis (32). These arene complexes are reversibly protonated, to give the appropriate [(T7-arene)2WH] species. By using the same technique, the analogous, niobium complexes were isolated (43). 

By mixing solutions of sulfur and the pentachlorides of niobium and tantalum in benzene in a dry, inert atmosphere at room temperature, fine crystalline powders are formed having the compositions NbSzCl and TaSjCU, respectively (361). By the direct interaction of sulfur with the pentachlorides in a sealed tube at 240-300°C, a reaction product sublimes it has the composition M(S2)n,Cln, where M is Nb or Ta, and m = 1-3, n = 1-4, depending on the initial ratio of MCI5 to S. 

Chlorine Trifluoride Tech. Bull. , Morristown, Baker Adamson, 1970 Incandescence is caused by contact with bromine, iodine, arsenic, antimony (even at -10°C) powdered molybdenum, niobium, tantalum, titanium, vanadium boron, carbon, phosphorus or sulfur [1], Carbon tetraiodide, chloromethane, benzene or ether ignite or explode on contact, as do organic materials generally. Silicon also ignites [2],... 

Niobium and rhodium cluster anions have been prepared by laser vaporization and the reactions with benzene studied by FT-ICR/MS (58). The reactions of the anions and similar cations have been compared. With few exceptions the predominant reaction of the niobium cluster anions and cations was the total dehydrogenation of benzene to form the metal carbide cluster, [Nb C6]-. The Nb19 species, both anion and cation, reacted with benzene to form the coordinated species Nb 9C6I I6p as the predominant product ion. The Nb22 ions also formed some of the addition complex but the Nb2o Nb2i, and all the other higher clusters, formed the carbide ions, Nb C6. ... 

In contrast to the addition of only one benzene molecule to even large niobium cluster anions, small niobium cluster anions react by the addition of up to 5 N2 molecules and up to 15 CO molecules (229). The reactions of the niobium cluster anions Nb (n = 2-7) were qualitatively similar to the reactions of the cluster cations and in both cases CO was more reactive than N2. The rates of reaction generally increased with increasing size of the cluster but in many cases extensive fragmentation of the clusters was observed. 

Bis(i -benzene)molybdenum(0), 3514 Bis(cyeloetatetraene)uranium(0), 3708 Bis(cyclopentadienyl)bis(pentalluorophenyl)zirconium, 3830 Bis(cyclopentadienyldinitrosylchromium), 3275 Bis(cyclopentadienyl)hexalluoro-2-butynechromium, 3636 Bis(cyclopentadienyl)lead, 3294 Bis(cyclopentadienyl)magnesium, 3277 Bis(cyclopentadienyl)manganese, 3278 Bis(cyclopentadienyl)niobium tetrahydroborate, 3324... 

Vanadium vapor has been used to prepare dibenzenevanadium (59), and it is expected that alkylbenzenes would also react smoothly with the vapor. A matrix isolation infrared study in which sputtered niobium atoms were reacted with benzene in an argon matrix at 30 K has given evidence for the formation of dibenzeneniobium (36). 

Reduction by NaAlH2Et2 was studied similarly, using an excess of the reagent (toluene solution, from Alfa) added to a benzene suspension of Cp2NbCl2-The niobium-containing product could not be separated from excess NaAlH2Et2, as they both appear to have very similar solubility properties. 

Pyrogallol - [COLORANTS FORFOOD, DRUGS, COSMETICS AND MEDICAL DEVICES] (Vol 6) - [NIOBIUM AND NIOBIUM COMPOUNDS] (Vol 17) - [POLYHYDROXY BENZENES] (Vol 19) - [PYRIDINE AND PYRIDINE DERIVATIVES] (Vol 20) -as antioxidant [POLYHYDROXY BENZENES] (Vol 19)... 

Bis(2,4-pentanedionato)chromium, 3320 Bis(benzene)chromium dichromate, 3845 Bis(benzeneiron)—fulvalenediyl complex, 3828 Bis(cycloctatetraene)uranium(0), 3701 Bis(cyclopentadienyl)bis(pentafluorophenyl)zirconium, 3824 Bis(cyclopentadienyldinitrosylchromium), 3269 Bis(cyclopentadienyl)hexafluoro-2-butynechromium, 3629 Bis(cyclopentadienyl)lead, 3288 Bis(cyclopentadienyl)magnesium, 3271 Bis(cyclopentadienyl)manganese, 3272 Bis(cyclopentadienyl)niobium tetrahydroborate, 3318... 

Lithium benzenetellurolate and bis[7t-cyclopentadienyl]dichloroniobium(IV) in diethyl ether/benzene at 0° produced the very unstable bis[n-cyclopentadienyl bis[benzenetelluro-lato niobium (IV)1. 

Examples of thenoyltrifluoroacetone (TTA) (in benzene) extraction can be found in the separation of. 3.8-minute V 2 in. neutron activation analysis (90), of zirconium activities in niobium bombarded by protons (128), and of 1.8-minute Pa22 from the reaction products of thorium bombarded.by a cyclotron (172,173,175)- 16-second Y89"1 (109) and 25-minute Am246 (74), the daughter products of Zr and Pu2 respectively, were separated by back extraction into acidic aqueous solution from the parent in TTA-benzene solution. 

Oxidizer, Poison, Corrosive SAFETY PROFILE Poisonous and corrosive. Very reactive, a powerful oxidizer. Explosive or violent reaction with organic materials, water, acetone, ammonium halides, antimony, antimony trichloride oxide, arsenic, benzene, boron, bromine, carbon, carbon monoxide, carbon tetrachloride, carbon tetraiodide, chloromethane, cobalt, ether, halogens, iodine, powdered molybdenum, niobium, 2-pentanone, phosphoms, potassium hexachloroplatinate, pyridine, silicon, silicone grease, sulfur, tantalum, tin dichloride, titanium, toluene, vanadium, uranium, uranium hexafluoride. 

The properties of niobium (V) chloride are well known. Cesium hexachloroniobate(V) is a bright yellow, crystalline, moisture-sensitive compound. It is soluble in iodine (I) chloride, less so in iodine (I) chloride-thionyl chloride mixtures, and completely insoluble in thionyl chloride it is very slightly soluble in acetonitrile and nitromethane but insoluble in benzene, carbon disulfide, ethyl acetate, and diethyl... 

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