Diol complexes

Laser-induced multiphoton excitation, 160 Laser sputtering, 158 Li -bound diol complexes, 204 LIF spectroscopy... 

The study of oxo-Cr(V)-diols complexes formed by reduction of Cr(VI) by GSH in the presence of m-cyclopentanediol (8) or Iram-cyclopentanediol (9) expanded the EPR analysis of oxo-Cr(V)-diols species to five-membered ring 1,2-diols.66 Unlike the Cr(V) complexes formed with 6 and 7, the 1,2-cyclopentanediols 8 and 9 lead to oxo-Cr(V) complexes having very similar EPR spectral patterns (Fig. 6). The spectra are in both instances the sum of two EPR components, both split by the hyperfine interaction with nonequivalent carbinolic protons (Table II). 

Diol complexes, 9 211 d ion complexes, heavier, structure changes prior to ligand exchange, 34 258-259 Diopside, 4 61 crystal structure of, 4 51 p-Dioxane complexes, osmium, 37 312... 

Diols and polyols can participate in equilibria with boric acid in aqueous solution. The stability of polyolborates is determined by the number of OH groups in cis positions. Complexes with polyols are more stable than with diols, and 1,2-diol complexes are more stable than their 1,3-diol counterparts (Table 10) since the resulting five-membered chelate ring is unstrained.75120 In the case of 1,3,5-triols stable cage-like structures (5) and (6) are favored. Open-chain or five-membered cyclic polyols form more stable chelate complexes than their six-membered counterparts.120 Thus, chelates from alditols and ketohexoses are more stable than the corresponding aldose chelates (Table 10). Many polyols allow quantitative titrimetric determination of boric acid. Of these, mannitol remains the most widely used reagent on the basis of availability, cost and ease of handling.75... 

At low temperatures in inert solvents (such as methylene dichloride) a controlled polymerization can be effected using various acids and alkylating agents. These initiators include boron trifluoride etherate, triethylaluminum, trityl hexachloroantimonate, triethylam-monium hexachloroantimonate, diethyloxonium hexafluoroantimonate, p-toluenesulfonic acid and diethylzinc or cadmium-1,2-diol complexes. Crystalline, high molecular weight... 

Toda, F., D. L. Ward., and Hart, H. (1981) Wheel-and-Axile Design as a Source of Host-Guest Compounds. The Crystal Structure of the 2 1 Acetone Tetraphenyl-2,4-hexadiyne-l,6-diol Complex, Tetrahedron Lett., 22, 3865-3868. 

Molybdenum trioxide (M0O3) deposited on silica was one of the first supported Mo catalysts to be prepared. In contrast to Ti/SiC>2, which is used industrially, Mo/SiC>3 did not break through commercially, mainly owing to substantial leakage of Mo under catalytic conditions. Trifiro et al. (213) showed that when M0O3 on silica is used for the epoxidation of cyclohexene with t-BuOOH in benzene at 353 K, part of the activity originates from dissolved Mo. The main reason why Mo is not entirely retained on silicas and aluminas is thought to be the formation of soluble neutral Mo-diol complexes. 

METAL-BOUND COMPLEXES Li+-Bound diol complexes... 

CrLCls DMF have normal magnetic moments (103) and are jirobably monomeric. The purple diol complex [(phen)2Cr(OH)2Cr(phen)2] as the iodide has been the subject of a magnetochemical investigation (221). The same cationic specie as the nitrate may be hydrolyzed to the orange cis-diaquobis(phenanthroline) chromium(III) ion (393). The tris-chelate... 

Calculation of the alternative schemes for the proton positions in the gem-diol complex with the active site were extended by Goldblum et al. (1993,1993a) to include the full... 

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