Bis chromate

Biegert, J., Diels, J.-C., and Milonni, P. W., 2000, Bi-chromatic 2-photon coherent excitation of sodium to provide a dual wavelength guide star. Optics... 

Potassium bi-chromate and petrmanganato are to be kaiMUed with care, especially in cotnbmatioa with finely divided metela. 

In another oxidative closure, the oximes of chalcones close to isoxazoles using tetrakis(pyridine)cobalt(II) bis(chromate), and in an interesting variant, isoxazoles... 

Organochromium Catalysts. Several commercially important catalysts utilize organ ochromium compounds. Some of them are prepared by supporting bis(triphenylsilyl)chromate on siUca or siUca-alumina in a hydrocarbon slurry followed by a treatment with alkyl aluminum compounds (41). Other catalysts are based on bis(cyclopentadienyl)chromium deposited on siUca (42). The reactions between the hydroxyl groups in siUca and the chromium compounds leave various chromium species chemically linked to the siUca surface. The productivity of supported organochromium catalysts is also high, around 8—10 kg PE/g catalyst (800—1000 kg PE/g Cr). 

The following stage of the propagation center formation occurs through the reduction of Cr(VI) to the lower oxidation state. The compounds of Cr(II) seem to be active in polymerization in the solution of bis-triphenyl-silyl-chromate (109). For the formation of these compounds the following scheme taking into account the results (110) concerning the study of the reaction of bis-triphenylsilyl-chromate with olefins was considered (109) ... 

In an alternative oxidation, addition of chromium trioxide to hexamethyldisilox-ane (HMDSO) 7 gives bis(trimethylsilyl)chromate 2065, which is stabilized by addition of Si02 and which oxidizes primary or secondary alcohols such as 2066 or 2968, in CH2CI2, to their corresponding carbonyl compounds 2067 or 2069, in high yields [207] (Scheme 12.62). 

Fig. 9 (a) Molecular structures of novel ESIPT dyes, 2,5,-bis[5-(4-t-butylphenyl)-[l,3,4]oxadia-zol-2-yl]-phenol (SOX), and 2,5-bis[5-(4-t-butylphenyl)-[l,3,4]oxadiazol-2-yl]-benzene-l,4,-diol (DOX). (b) Emission colors in the Commission Internationale de L Eclariage (CEE) chromaticity diagram. The inner oval and the filled circle at coordinate (x,y) of (0.33, 0.33) indicate the white region and the ideal color, respectively. Note that PS and PVK denote polystyrene and poly (N-vinylcarbazole) film (reprint from ref. [91], Copyright 2005 Wiley-VCH)... 

Fig. 8 a The crystal is formed of columns of methoxychromate anions and of columns of bis-benzene chromium cations extending parallel to the c-axis. b The anions are apparently linked along the column via a short C-H O interaction (H O 2.381 A, C-H O 173°) between a methyl hydrogen and a chromate oxygen... 

Bis(trimethylsilyl) chromate, 2591 Cadmium oxide, 3958 Caesium oxide, 4264... 

Bis(benzene)chromium dichromate, 3851 Calcium chromate, 3926 Copper chromate oxide, 4223 Dibismuth dichromium nonaoxide, 0232 Lead chromate, 4243 Lithium chromate, 4236 Magnesium permanganate, 4691 Potassium dichromate, 4248 Potassium permanganate, 4647 Sodium dichromate, 4250 Sodium molybdate, 4713 Sodium permanganate, 4703 Zinc permanganate, 4710... 

Synonyms Bis(tert-butyl)chromate acid, di-tert-butyl ester... 

Bis(trimethylsilyl) chromate, 2591 Cadmium oxide, 3958 Caesium oxide, 4264 Caesium trioxide, 4263 Calcium oxide, 3937 Chromium(II) oxide, 4241 Chromium(III) oxide, 4251... 

R. Kapre, K. Ray, I. Sylvestre, T. Weyhermiiller, S. DeBeer George, F. Neese, and K. Wieghardt, Molecular and electronic structures of oxo-bis(benzene-l,2-dithiolato)chromate(V) monoanions. A combined experimental and density functional study, Inorg. Chem., 45 (2006) 3499-3509. 

R. I. ludd, T. W. Hambley, and P. A. Lay, Electrochemistry of the quasi-reversible bis[2-ethyl-2-hydroxybutanoato(2-)]oxo-chromate(V) and (IV) and bis[2-hydroxy- methylbutanoato(2-)]oxochro-mate-(V) and (IV) redox couples and the crystal molecular structure of sodium bis[2-ethyl-2-hydro-xybutanoato(2-)]oxochromate (V) sesquihydrate, J. Chem. Soc. Dalton Trans. (1989) 2205-2210. 

Bi(N03)3 + 3NaOH Bi(OH)3 + 3NaN03 Reaction with potassium chromate produces bismuth chromate ... 

Figure 17. An ORTEP view of the anion of [(2-pyridyl)(l-hydro-2-pyridinium) amine] [bis (2,6-pyridinedicarboxylato)chromate(III)] trihydrate shown with 30 % probability ellipsoids and the atom numbering scheme. (Reproduced by permission from reference 119).

C22H46ClCrNi6Ni2, Chromate(III), trans-bis(tetraethylenepentamine nickel(II))-hexacyano-, chloride, 34 147 C24H4Na20240sio, Osmate(2-), tetra-cosacarbonyltetra(/4-hydrido)deca-, sodium, 34 223... 

ClCrNi6Ni2C22H46, Chromate(III), tra7M-bis(tetraethylenepentamine nickel(II))hexacyano-, chloride,... 

The apparent simplicity and virtual certainty of Kurtz assumption are somewhat clouded by results obtained on complexes of hydroxyethylethylenediamine and similar ligands, for determined efforts have failed to reveal any of the normal reactions on the part of the free alcoholic function in complexes of cobalt (III) with these ligands (24, 25). In contrast, Krause and Goldby have esterified the free hydroxyethyl group in bis (2-hydroxyethyliminodiacetato) chromate(III) (46). 

Sodium tricarbonyl ( /5-cyclopentadienyl)chromate(l —)-bis(l, 2-dimethoxy-ethane), Na[Cr(CO)3(//5-C5H5)]-2DME, is a pale yellow powder, stable under N2 but decomposes in air. It can be stored for several weeks under nitrogen at — 20 °C. It is insoluble in nonpolar solvents such as hexane... 

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