Tetra-amines

A similar technique was used by Soliman, who also used a silica gel matrix and a covalent linker to tie to a series of amines, mono-, di-, tri-, and tetra-amine [15]. Using a batch equilibrium technique, he measured the removal capacities (mmole/g) for divalent forms of cobalt, nickel, copper, zinc, cadmium, and lead. In general maximum removal values (at optimum pH values) were obtained for the tetra-amine species. 

Tetra-amine ligands are represented by a series of compounds of the types 170 173 [261,285e,298] ... 

Dendritic photoinitiators have been assembled from 2-(2,3-epoxy)propyloxythioxanthone 637 and tetra-amines (Scheme 245) <2004MM7850> and this strategy has been employed to perform an electrostatic self-assembly of a polymer brush <2005CC4927>. 

Ipaktschi and Sharifl reported the palladium-catalyzed synthesis of 2,7-diamino fluorenones by two indirect routes due to the base sensitivity of fluorenones [182]. First, 2,7-dibromofluorene was reacted with secondary amines, and subsequent oxidation of the product formed the diaminofluorenone. Alternatively, reaction of ami-nostannanes derived from secondary amines with 2,7-dibromofluorenone gave yields of the fluorenone ranging from 42 to 58%. Beletskaya has used the DPPF-ligated palladium system to conduct selective monoarylation of ethylene diamine, diethylene triamine, triethylene tetra-amines, and 2,2-dimethyl butane-1,3-diamine [183]. 

The complexing power of cobalt with trimethylamine or pyridine is variable mono-, di-, and tetra-amine complexes have been obtained, but there are... 

A series of iron(III) complexes, c/s-[Fe(tetraamine)(OH)2]2+, where tetra-amine is a tetradentate amine such as 7V,jV -bis(2-picolyl)ethylenediamine, bound electrostatically to poly-L-glutamate or dextran sulfate, has been studied as catalysts for the decomposition of hydrogen peroxide into water and oxygen.72 The catalyst performance varies with the mode of binding and nature of the support, thus demonstrating the importance of the local environment around the catalytically active site. 

M--0- phenyl Cu2LBr2(CI04)Me0H square pyramidal (tetra amine, //-phen- and distorted trioxide ligand with /(-Br gonal bipyramidal axial Br and MeOH) 139 425-450R 650 R 84 h... 

As an example, Fig. 4 illustrates the Ni11 complexation equilibria in water involving 2.3.2-tet (1), champion of non-cyclic tetra-amines, and cyclam (2),... 

Fig. 4 Thermodynamic macrocyclic effect complexation equilibria involving the Nin aqua.ion and the champions of non-cyclic tetra-amines 1 (2.3.2-tet) and of the tetra-amine macrocycles 2 (cyclam)...

Chiral di mination studies with the tetra-amine 54 were also performed with respect to racemic molecular anions via the formation of cascade complexes. Regulation of the chiral discrimination may be achieved to some extent by the nature of the cation initially complexed. Efficient ion pairing with molecular anions is favoured in solvents of low polarity. In this respect, aqueous solutions of alkali metal salts of ( )-mandelic acid or (+)-a-hydroxy-l-naphthaleneacetic acid were extracted into a CDCI3 phase where the ligand 54 is dissolved. In case of the mandelate anion, the anion ligand ratios in the CDCI3 layer were as follows Na (0.6 1), (1 1),... 

Linear hexadentate tetramine phenols such as (26) have been shown to form metal derivatives that are very stable in aqueous solutions.34 This class of ligands generally binds the metals in a dianionic N402-donor form, yielding an octahedral environment. The four nitrogen atoms of the tetra-amine backbone form the equatorial plane of the octahedron, whereas the two phenolates are coordinated trans to each other.34... 

Diformylpyridine and 2,6-diacetylpyridine undergo template condensations with hexa-amines (143) to form dinuclear diimine cations (144), which reduce to the bis(2,5-pyridiyl)tetra-amines (145) (Scheme 34). 

Salts of tetra-amine phthalogyanine such as Cu, Co, and Ni have also been used as curatives with success to give cured resins with considerable improvements in heat resistance compared with resins prepared with conventional curatives. Evidence for this is the considerable reduction in cure temperature by use of the catalytic BF3(MeNH) complex. 

Amine Donors. Complexes with l,3-bis[2(S)-aminomethyl-l-pyrrolidinyl]propane and other optically active tetra-amines containing pyrrolidinyl groups with six-membered chelate rings have been studied, and the stereochemistry of the complex depends on the position of the two pyrrolidinyl groups in the ligand. Studies of ability of similar complexes to hydrolyse esters have been reported. Stability constant measurements for nickel(ii) monoamine complexes have been made in a number of hydroxylic solvents. Magnetic and optical spectral measurements of some nickel(ii) succinimide and mixed amine-succinimide complexes indicate that... 

Toth and Hanson synthesized a number of tetra-amine functionalized diphosphines and achieved a very high water-solubility by methyl quaternization of their rhodium complexes. As outlined in Scheme 2 a new p-dimethylamino derivative of DIOP was prepared by standard procedures and quatemized with Meerwein s salt, [(CH3)30][BF4], after complexation to rhodium [20a]. Coordination of the ligand prevents alkylation of the phosphorus atoms. 

Diphenyl isophthalate 2,2 -Dimethyldiphenyl-methane-3,3, 4,4 -tetra-amine... 

The most promising actinide squestering agents yet prepared (Table IX) are the sulfonated catechoylamide derivatives of linear tetra-amines. These compounds appear to strongly bind tetravalent actinides, while only weak complexation has been observed for trivalent and divalent metals. A derivative of the natural product spermine, 3,4,3-LICAMS, is more effective in plutonium removal at low dosages than any other sequestering agent tested to date. 

Novel Tc-based tetra-amine-functionalized [Tyr ]octreotate analogues (Fig. 2.3.10) have been developed for imaging of somatostatin receptor-positive tumors (Maina et al. 2002 Nikolopoulou et al. 2006). 

The same open-chain tetra-amine ligand has been conjugated to various bombesin derivatives. First studies in mice showed high and specific accumulation of Tc-De-... 

Chloro Tetra Amine Chromium Chloride CrCl(NH3).(OHj)Cl. 

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