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Lithium, reduction

A recent modification of this technique utilizes A,A-d2-propylamine as the solvent for the lithium reduction, thereby eliminating the inconveniences associated with the preparation and handling of liquid deuterioammonia. Under these conditions the reaction can be carried out at room temperature and less overreduction of the carbonyl group is observed. For example, the reduction of A" -3-keto steroids (159) under these conditions, followed by back exchange in protic media, leads to the corresponding 5a-di-3-ketones (160) which exhibit good isotopic purity. ... [Pg.190]

Lithium reductive deacetoxylation of the tetrahydropyranyl ether of 17o -ace-toxypregn-5-en-3/3-ol-20-one, 56... [Pg.496]

Truce also examined a few examples of the cleavage of sulphones with sodium in liquid ammonia97 and found essentially similar results except that diaryl sulphones were reduced to sulphinate salts instead of to arylthiolates as with the lithium reductions. Dialkyl sulphones were unreactive towards sodium in liquid ammonia. [Pg.944]

Metallothermic reduction of chlorides has been the basis of some very important processes for reactive metals production. Examples include the Kroll and Hunter processes for the preparation of zirconium and titanium, and calcium or lithium reduction processes for the rare earths. [Pg.416]

While the most reactive Mg was produced using the lithium reduction procedure in the presence of alumina, the presently preferred method is entry 11. Though not as reactive as 10, it is more reproducible. The procedures which do not employ alumina also extend equipment life and are thus safer. [Pg.238]

Figure 6. Comparison of the TR3 spectrum of Ru(bpy)s2 (top) to the c.w. resonance Raman spectrum of bipyridine radical anion (lithium reduction) (bottom), (Reproduced from Ref. 19c. Copyright 1981, American Chemical Society.)... Figure 6. Comparison of the TR3 spectrum of Ru(bpy)s2 (top) to the c.w. resonance Raman spectrum of bipyridine radical anion (lithium reduction) (bottom), (Reproduced from Ref. 19c. Copyright 1981, American Chemical Society.)...
The cyclic voltammogram for a silver electrode in 0.1M LiC104 acetonitrile solution is shown in Figure 1 (curve a). At a potential of -1.5 V, cathodic current due to the reduction of Li+ ions commences. The upd of lithium has been reported previously by Kolb et al. for positive potential sweeps after substantial lithium reduction (i) however, due to the reactivity of the metallic lithium with impurities in solution, the adsorbed layer formed on the negative potential sweep is not as stable as other upd monolayers (i). An additional cathodic wave due to the reduction of lithium is observed at approximately -2.5V, and on the return sweep the lack of an anodic wave is indicative of the reactivity of the chemisorbed atoms. [Pg.295]

Lead tetraacetate, oxidation of a hydrazone to a diazo compound, 50, 7 Lithio ethyl acetate, 53, 67 Lithium, reductions in amine solvents, 50, 89 Lithium aluminum hydride, reduction of exo-3,4-dichloro-bicyclo-[3.2.l]oct-2-ene to 3-chlorobicyclo[3.2.l]oct-2-ene, 51, 61... [Pg.131]

Recently, an NMR study of the diamagnetic species resulting from lithium reduction of 8 was reported. The THF solution revealed a single H NMR peak at 6.95 ppm, and three C NMR lines at 86.8, 95.1, and 112.4 ppm, indicating that the reduced species retains the high symmetry of neutral corannulene. Moreover, consideration of the C NMR chemical shift, as compared to neutral 8, provides a... [Pg.30]

Lithium borohydride, 62 Lithium f-butoxide, 69 Lithium cyanohydridoborate, 92 Lithium diisopropylamide, 477 Lithium reductive deacetoxylation, 56 Lithium reduction of 17a-ethynyl-19-nortestosterone, 55... [Pg.262]

Tetrakis(trialkylsilyl)disilenes 22 and 23 react with excess lithium in THF giving the corresponding 2,3-dilithiotetrasilanes 161 and 162 as thermally stable off-white powders [Eq. (72)].115 Interestingly, under the same conditions, the reduction of tetrakis(triisopropylsilyl)disilene 24 provides quantitatively bis(triisopropylsilyl) dilithiosilane 78 [Eq. (73)] 115 dilithiosilane 78 is known to be obtained also by the lithium reduction of 3,3-bis(triisopropylsilyl)-l,2-bis(trimethyislyl)silacyclo-propene.12... [Pg.124]

Given and coworkers studying the "British Macerals" took more of an organic chemist s approach to characterization. The macerals were subjected to solvent extraction, lithium reduction, hydroxyl determination, oxidation, and reaction with various reagents. N-bromosuccinimide (NBS) was used to bromin-ate aliphatic carbons which in the case for four macerals from an Aldwarke Silkstone coal yielded per 100 carbon atoms the following distribution of hydrogen which is replaced by bromine (61) vitrinite 16, exinite 25 1/2, micrinite 12, and fusinite... [Pg.16]

Active zinc prepared from the lithium reduction of zinc chloride using catalytic naphthalene... [Pg.27]

This form of active zinc prepared in the presence of an electron carrier can readily form arylzinc iodides at room temperature from aryl iodides. Aryl bromides reacted far more efficiently with reduced reaction times at refluxing temperatures. The newer two-pot lithium reduction procedures for the preparation of active zinc requires 3-4 h for a total preparation time. Whilst the old one-pot preparation of active zinc from the reduction of zinc salts with lithium... [Pg.28]

Fig. 17.50. One-pot synthesis of an alkyl-substituted aromatic compound that involves a dissolving lithium reduction of a benzyl alkoxide. Fig. 17.50. One-pot synthesis of an alkyl-substituted aromatic compound that involves a dissolving lithium reduction of a benzyl alkoxide.

See other pages where Lithium, reduction is mentioned: [Pg.54]    [Pg.55]    [Pg.56]    [Pg.496]    [Pg.496]    [Pg.8]    [Pg.295]    [Pg.277]    [Pg.185]    [Pg.339]    [Pg.79]    [Pg.97]    [Pg.36]    [Pg.37]    [Pg.104]    [Pg.257]    [Pg.257]    [Pg.262]    [Pg.299]    [Pg.34]    [Pg.91]    [Pg.27]    [Pg.170]   
See also in sourсe #XX -- [ Pg.25 , Pg.26 , Pg.27 , Pg.28 ]




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Aliphatic nitro compounds, reductions, lithium aluminum

Alkyl fluorides reduction with lithium aluminum hydride

Alkynes reduction with lithium aluminium

Allylic alcohol, reduction with lithium

Allylic compounds reductions, lithium aluminum hydride

Amide reduction with lithium aluminum hydride

Annulenes lithium metal reduction

Benzonitriles reduction with lithium

Benzylic compounds reductions, lithium aluminum hydride

Birch reduction with lithium/trimethylsilyl chloride

Borohydride lithium, reduction with

Corannulenes lithium metal reduction

Dimers lithium metal reduction

Fullerenes lithium metal reduction

Hydrazones reductions, lithium aluminum hydride

Hydrocarbons lithium metal reduction

Iminium ions reductions, lithium aluminum hydride

Isoquinoline lithium aluminum hydride reduction

Lithium Aluminum Hydride Reduction of an Amide

Lithium Birch reduction

Lithium a,p-unsaturated ketone reduction

Lithium alkyl halide reduction

Lithium alkylcuprates reduction

Lithium aluminium hydride diastereoselective reductions

Lithium aluminium hydride reduction with

Lithium aluminium hydride reductions of imines

Lithium aluminium hydride, reductions

Lithium aluminium hydride: chemoselective reduction with

Lithium aluminium hydride: chemoselective reductions

Lithium aluminohydride reduction

Lithium aluminum deuteride reduction

Lithium aluminum deuteride reduction with

Lithium aluminum hydride alkyl halide reduction

Lithium aluminum hydride azides reduction

Lithium aluminum hydride benzylic halide reduction

Lithium aluminum hydride carboxylic acids reduction

Lithium aluminum hydride cyclic ketone reduction

Lithium aluminum hydride in reduction of acids

Lithium aluminum hydride reduction kinetics

Lithium aluminum hydride reduction of amides

Lithium aluminum hydride reduction of disulfides

Lithium aluminum hydride reduction of ester

Lithium aluminum hydride reduction reactions involving

Lithium aluminum hydride reduction, alcohols

Lithium aluminum hydride reduction, alcohols amines from

Lithium aluminum hydride reduction, alcohols from, with carbonyl compounds

Lithium aluminum hydride reductions chirally modified

Lithium aluminum hydride selective ketone reduction

Lithium aluminum hydride, hazards in reduction, of cinnamic acids and

Lithium aluminum hydride, in reduction

Lithium aluminum hydride, reduction

Lithium aluminum hydride, reduction amides

Lithium aluminum hydride, reduction carbonyls

Lithium aluminum hydride, reduction chlorodeoxy sugars

Lithium aluminum hydride, reduction esters

Lithium aluminum hydride, reduction oximes

Lithium aluminum hydride, reduction reactions with

Lithium aluminum hydride, reductive

Lithium amalgam, reduction

Lithium amide reduction

Lithium azide reduction with

Lithium borohydride reduction

Lithium borohydride, reduction esters

Lithium borohydride, reduction imides

Lithium borohydride, reduction ketones

Lithium bronze reduction

Lithium carbonyl compound reduction

Lithium carboxylic acid reduction

Lithium cyanoborohydride, reduction

Lithium diethoxyaluminum hydride reduction

Lithium diisopropylamide aldehyde reduction

Lithium dimesitylborohydride reduction

Lithium diphenylphosphide reduction

Lithium ester reduction with

Lithium hydride reduction

Lithium isopropoxide reduction of steroidal ketones

Lithium lactam reduction with

Lithium mesylate reduction with

Lithium metal reduction

Lithium metal reduction reductive dimerization

Lithium metal, reductive lithiation with

Lithium naphthalenide reduction

Lithium naphthalide reduction

Lithium reduction kinetics

Lithium reduction of alkynes

Lithium reduction potential

Lithium reductive cleavage

Lithium reductive deacetoxylation

Lithium reductive dimerization

Lithium selective ketone reduction

Lithium triethoxyaluminum hydride reduction

Lithium triethyl borohydride reduction with

Lithium triethylborohydride reduction

Lithium triethylborohydride, reductive

Lithium trimethoxyaluminum hydride reduction

Lithium tris aluminum hydride reduction

Lithium tris borohydride reduction

Lithium trisiamylborohydride, reduction

Lithium trisiamylborohydride, reduction ketones with

Lithium unsaturated hydrocarbon reduction

Lithium, reduction dioxan

Lithium, reductions in amine solvents

Lithium, standard reduction potentials

Lithium-Alkylamine reduction

Lithium-ammonia reduction

Lithium-ammonia reduction aromatic rings

Lithium-ammonia reduction epoxides

Lithium-ammonia reduction halides

Metalations reductive, lithium naphthalenide

Nitriles reductions, lithium aluminum hydride

Nitrogen compounds reductions, lithium aluminum hydride

Of lithium aluminum hydride reduction

Oxetanes, lithium aluminum hydride reductive

Oximes, reduction with lithium aluminum hydride

Oxirane reduction with lithium aluminum hydride

Palladium lithium metal reduction

Polycycles lithium metal reduction

Pre-Reduction of Carbonyl Groups with Lithium Aluminum Hydride

Pregnenolone acetate, reduction with lithium aluminum tri-Z-butoxyhydride

Pyridinium salts lithium aluminum hydride reduction

Quinoline lithium aluminum hydride reduction

Reduction by lithium aluminium hydride

Reduction by lithium aluminum hydride

Reduction by lithium aluminum hydride or similar compounds

Reduction by lithium in organic amines

Reduction epoxide, lithium aluminum hydride

Reduction lithium enolate synthesis

Reduction of Carboxylic Acids by Lithium Aluminum Hydride

Reduction of Corannulene with Lithium

Reduction of esters by lithium

Reduction reactions Lithium borohydride

Reduction with lithium aminoborohydride

Reduction with lithium aminoborohydrides

Reduction with lithium in deuterioammonia

Reduction with lithium in liquid ammonia

Reduction with lithium triethylborohydride

Reduction with lithium/liquid ammonia

Reduction, and amidation of methyl by lithium aluminum hydride

Reduction, of 3/3-acetoxy-5-pregnene-20one with lithium aluminum chloride

Reductions alcohol synthesis, lithium aluminum hydride

Reductions stereoselective, lithium aluminum hydride

Reductions with lithium aluminum hydride

Reductive Lithiation using Lithium Metal

Reductive alkylation Lithium-Ammonia

Reductive cleavage Lithium triethylborohydride

Reductive cleavage lithium - liquid ammonia

Reductive cleavage with lithium aluminum hydride

Reductive coupling lithium

Trisiamylborohydride, lithium reduction with

With lithium, reduction

With lithium, reduction aromatic compounds

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