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Chromium complex compounds, anions

Chromium (III) complex compounds, anions, oxalato, K3[Cr(C204)3]-3H20, 1 37... [Pg.229]

The Cr1 ion readily forms complexes it exists in aqueous solution as CrfH 0)j. and forms other complexes wilh anions, such asCr(H 0).CI , Crother properties due to variation in the bonding. Compounds or the trichloride have been reported with the following arrangements CrtHjOlsClj. [CrfHiOlsCljCIi- HiO. and [Cr(HiO)4Cf CU2 H 0 Trivalenl chromium also forms double salts, notably the chromium alums, hydrated double salts of Cr(III) sulfate and the alkali metal (or thallium or ammonium) sulfates. [Pg.382]

Reactions of metal carbonyls with Zintl phases do not always yield the desired result. An example is the reaction of KSi with the metal carbonyls M(CO)6 (M = Cr, Mo, W) and the chromium complex Cr(CO)sNMe3. Instead of forming a structure with a Si4 anion, KSi reduces these transition metal compounds to form the anions, [M2(CO)io] . In addition, certain organometallic transition metal clusters have been synthesized that contain Zintl anions coordinated to the metal, but Zintl compounds are not used as the reagents. [Pg.5259]

Vanadium, the first element in Subgroup oA, and neighbour to chromium, is found in association with molybdenum in certain complex compounds. For example, when boiling solutions of molybdo-oxalates react with vanadium pentoxide, crystalline products are obtained which are thought to be substituted vanadates containing the complex anion... [Pg.169]

An example, developed by our group, has been presented 3-chloro-propenyl pivalate, the new synthon we propose as a formal a-hydroxy allyl anion, and chromium(II) chemistry allow to achieve the formal diastereo- and enantio-selective a-hydroxyallylation of carbonyl compounds by applying a catalytic cycle based on an in situ produced Salen-chromium complex (Table 8.3). [Pg.168]

It is well known that the tricarbonylchromium-complexed benzylic anions and cations are stabilized due to overlapping between d-orbital of the chromium and p-orbital of the benzylic carbon [1]. Tricarbonylchromium complexes of a-te-tralone and a-indanone having a carbonyl group at the side chain underwent a deprotonation of the exo-benzylic protons by treatment with base to give the stereo-controlled tricyclic compounds (Eqs. 1 and 2) [2]. In these cases, Robinson annulation products were formed in less than 10% yield. Also, base treatment of benzyl ether chromium complex having a chlorine at the side chain 3 gave cyclization product as a diastereomeric mixture (Eq. 3) [3]. [Pg.130]


See other pages where Chromium complex compounds, anions is mentioned: [Pg.502]    [Pg.393]    [Pg.124]    [Pg.181]    [Pg.167]    [Pg.268]    [Pg.280]    [Pg.49]    [Pg.54]    [Pg.320]    [Pg.48]    [Pg.104]    [Pg.254]    [Pg.502]    [Pg.788]    [Pg.171]    [Pg.191]    [Pg.271]    [Pg.49]    [Pg.292]    [Pg.1068]    [Pg.239]    [Pg.502]    [Pg.564]    [Pg.787]    [Pg.167]    [Pg.6194]    [Pg.338]    [Pg.104]    [Pg.271]    [Pg.277]   


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Anion complexation

Anion, , complex

Chromium anionic complexes

Chromium anions

Chromium complex compounds

Chromium complex compounds anions, oxalato

Chromium compounds

Complex anionic

Compounds anionic

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