Ethylenediamine, complexes with chromium

Ethylene, with p-methoxyphenyl-acetyl chloride and aluminum chloride to give 6-me thoxy-g-tetralone, 51, 109 Ethylenediamine, complexes with chromium(II) salts,... 

Esters, from diazoketones and organo-boranes, 53, 82 Esters, a-deuterio-, S3, 82 Esters, 7,6-unsaturated by Claisen rearrangement, 53,122 Ethers, by oxymercuration, 53, 96 Ethers, aryl methyl-, selective mono-demethylation of, 53, 93 Ethyl diazoacetate, as source of car-bethoxycarbene, 50, 94 Ethylenediamine, complexes with chromium(II) salts, 52, 62 Ethylene, with p-methoxyphenylacetyl chloride and aluminum chloride to give 6-methoxy-/3-tetralone,... 

Dehalogenation. Barton et at. (1, 148) effected dehalogenation of steroidal /i-hydroxy halides with chromium(II) acetate and butancthiol as the proton donor in DMSO. The method is only useful with tertiary halides. A recent improvement that permits reduction of halides of all types uses the ethylenediamine complex of CrtCIOzh and the tetrahydropyranyl ethers of the /J-hydroxy halide. Catalytic amounts of the reducing agent can be used in "indirect electrolysis." The reaction is convenient for preparation of deoxynucleosides.1... 

Metal salts such as chromium(II) chloride (CrCb) complexed with ethylenediamine reduce a-bromo-naphthalene in dimethylformamide at room temperature in 93-98% yield. ... 

As has been demonstrated in Section 3.1.2.4, complexation of amino groups offers a quite different concept for reversible protection. Making use of this principle, the coordination of chromium carbyne complexes with amino acids was described as a new amino protection. Similarly, bis(ethylene-diamine)cobalt(III) complexes of amino acids constitute a new interesting method for protection which recently was extended to the development of a new type of anchoring in solid-phase synthesis (Scheme 69). First, a t-BOC amino acid is condensed with the aquabis(ethylenediamine)cobalt(lII) complex of p-aminomethylbenzoic acid. The handle obtained in this way is then linked to aminomethyl polystyrene to give the anchored amino acid (69). Due to the sufficient stability of the complex toward... 

The retention profiles of the water-soluble polymer the poly (ethylenediamine tetra-acetic acid-co-lactose) clearly show that the polymer has a strong binding ability for iron and chromium, as it exhibited a strong metal complexation with Cr(III) and Fe(III) with retention values of 100%. In contrast, Co(II), Ni(II), Cu(II), Zn(II), Sr(III), Cd(II), Pb(II), and Al(III) showed lower retention values (20-80%). Thus, the enrichment of Cr(III) and Fe(III) from the other metal ions can be achieved. 

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