Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Chromium chloride-Lithium aluminum

ALLENES Alkyllithium reagents. Chromium(HI) chloride-Lithium aluminum hydride. Formaldehyde. N,N-Mcthylphcnylamino(tri-n-butylphos-phonium) iodide. Tricthyl orthoaeetate. Trimethylsilylm ethyEmagncsium chloride. [Pg.471]

Chromium(III) chloride-Lithium aluminum hydride, 84 Dialkylaluminum amides, 206 Diazomethane-Alumina, 14 Dibromoalane, 237... [Pg.405]

HOMOALLYLIC ALCOHOLS Cerium amalgam. Chromium(II) chloride. Fluorodimethoxyborane. Hypochlorous acid. Lithium bronze. Manganesc(II) chloride-Lithium aluminum hydride. Methylenetriphenylphosphorane. Organotitanium reagents. Tetrakis(triphenylphosphine)palladium. Tin. Tin(II) fluoride. [Pg.313]

Okude, Y., Hiyama, T., Nozaki, H. Reduction of organic halides by means of chromium(lll) chloride-lithium aluminum hydride reagent in anhydrous media. Tetrahedron Lett. 1977, 3829-3830. [Pg.641]

ALLENIC ALCOHOLS Chromium(III) chloride-Lithium aluminum hydride. [Pg.240]

Chromium(III) chloride-Lithium aluminum hydride. The reagent is prepared by reduction of 2 equiv. of anhydrous CrC j with 1 equiv. of LiAIH, in THF at 0 and is presumably chromium(ll) chloride. The advantage of this new chromium... [Pg.60]

Cholestanone, 497 5a-Cholestanone, 475 A -Cholestene, 497 A -Cholestene-3d,5a-diol, 110 A -Cholestene-3/3,5(3-diol, 110 Cholesteryl benzoate, 110 Chromenes, 235-236 A -Chromens, 407 Chromic acid-Silica gel, 110 Chromic anhydride-3,5-Dimethylpyrazole complex, 110 Chromium carbonyl, 110 Chromium(III) chloride-Lithium aluminum hydride, 110-112 Chromyl chloride, 112 ... [Pg.296]

Related Reagents. Lithium Aluminum Hydride-(2,2 -Bipy-ridyl)(l,5-cyclooctadiene)nickel Lithium Aluminum Hydride-Bis(cyclopentadienyl)nickel Lithium Aluminum Hydride-Boron Trifluoride Etherate Lithium Aluminum Hydride-Cerium(III) Chloride Lithium Aluminum Hydride-2,2 -Dihydroxy-l, E-binaphthyl Lithium Aluminum Hydride-Chromium(III) Chloride Lithium Aluminum Hydride-Cobalt(II) Chloride Lithium Aluminum Hydride-Copper(I) Iodide Lithium Aluminum Hydride-Diphosphoms Tetraiodide Lithium Aluminum Hydride-Nickel(II) Chloride Lithium Aluminum Hydride-Titanium(IV) Chloride Titanium(III) Chloride-Lithium Aluminum Hydride. [Pg.215]

The condensation is usually carried out by adding a solution containing equimolar amounts of the allyl halide and the aldehyde or ketone to a solution of at least two equivalents of chromium-(II) chloride in THF at 0 5°C. Frequently, the less precious component is used in 50-100% excess. Although commercially available anhydrous chromium(II) chloride can be utilized (Method B), its in situ preparation from chromium(III) chloride and lithium aluminum hydride (Method A) is often preferred. The removal of chromium and aluminum hydroxide, which are formed on aqueous workup, can be accomplished by filtration in the presence of a filtration aid. [Pg.435]

The quality of the refined metal, and the current efficiency strongly depend on the soluble vanadium in the bath and the quality of the anode feed. As the amount of vanadium in the anode decreases, the current efficiency and the purity of the refined product also decrease. A laboratory preparation of the metal with a purity of better than 99.5%, containing low levels of nitrogen (30-50 ppm) and of oxygen (400-1000 ppm) has been possible. The purity obtainable with potassium chloride-lithium chloride-vanadium dichloride and with sodium chloride-calcium chloride-vanadium dichloride mixtures is better than that obtainable with other molten salt mixtures. The major impurities are iron and chromium. Aluminum also gets dissolved in the melt due to chemical and electrochemical reactions but its concentrations in the electrolyte and in the final product have been found to be quite low. The average current efficiency of the process is about 70%, with a metal recovery of 80 to 85%. [Pg.720]

Other reagents that have been used to reduce support-bound aromatic nitro compounds include phenylhydrazine at high temperatures (Entry 5, Table 10.12), sodium borohydride in the presence of copper(II) acetylacetonate [100], chromium(II) chloride [196], Mn(0)/TMSCl/CrCl2 [197], lithium aluminum hydride (Entry 3, Table... [Pg.283]

Tetra-p,3-carbonyldodecacarbonylhexa-rhodium, 288 of alkyl halides to alkanes Chromium(II) chloride, 84 Lithium aluminum hydride-Ceri-um(III) chloride, 159... [Pg.371]

Aluminum welding, too, has been shown to be a cause of asthma. Aluminum electrodes used in welding contain chlorides, fluorides, chromium, nickel, lithium sodium, potassium, and aminoethyl ethanolamine in addition to aluminum.I69l... [Pg.274]

On the other hand, reductive cleavage of the dienone lactam 91 with chromium(II) chloride gave the dibenz[with lithium aluminum hydride. Deprotection of 76biosynthetic precursor of the Schelhammera alkaloids. Oxidation of the diphenol 76a by potassium ferricyanide in the two-phase system gave the expected 5,7-fused dienone 77 in 61% yield (50). [Pg.206]

The pinacol (94) was also obtained by reductive dimerization of retinaldehyde (2) with zinc amalgam (Reedy, 1968) or in the presence of chromium(III) salts (Sopher and Utley, 1979). With a mixture of lithium aluminum hydride and titanium chloride in anhydrous tetrahydrofuran, retinaldehyde (2) underwent reductive coupling to give p-carotene (Akiyama et al., 1979 Mukaiyama, 1977 McMurry et al., 1978 Ishida and Mukaiyama, 1977). [Pg.37]

See other pages where Chromium chloride-Lithium aluminum is mentioned: [Pg.366]    [Pg.587]    [Pg.631]    [Pg.2393]    [Pg.101]    [Pg.74]    [Pg.170]    [Pg.170]    [Pg.170]    [Pg.17]    [Pg.170]    [Pg.959]    [Pg.476]    [Pg.293]    [Pg.382]    [Pg.21]    [Pg.100]    [Pg.102]    [Pg.607]    [Pg.903]    [Pg.926]    [Pg.70]    [Pg.959]    [Pg.424]    [Pg.537]   


SEARCH



Aluminum chloride

Aluminum chromium

Chromium chloride

Chromium chloride-Lithium aluminum hydride

Chromium chlorids

© 2024 chempedia.info