Stereoselective Synthesis of (+)-SCH 351448: A Unique Ligand System for Sodium, Calcium, and Other Cations (original) (raw)
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A Unique Coordination Chemistry of Sodium
Inorganic Chemistry …, 2009
The first report of coordination chemistry of alkali metals came to us as early as on 1925 when Sidgwick and Brewer reported the synthesis of salicyaldehyde and β-diketonate complexes of alkali metals [1]. After that for a long time this area was not well explored due to the ...
Syntheses, spectroscopic characterization and crystal structures
Polyhedron, 2006
Some new phosphoramidates with formula 4-F-C 6 H 4 C(O)N(H)P(O)X 2 , X = NC 4 H 8 (1), NC 5 H 10 (2), 4-CH 3-NC 5 H 9 (3), NC 4 H 8 O (4), NC 6 H 12 (5), N(CH 2 CH 3) 2 (6), N(CH 2 CH 2 CH 3) 2 (7) were synthesized. The reaction of compound 2 with dimethyltin(IV) dichloride leads to an octahedral organotin(IV) complex, SnCl 2 (CH 3) 2 [4-F-C 6 H 4 C(O)N(H)P(O)(NC 5 H 10) 2 ] 2 (8) with equal ligands in trans positions. These compounds were characterized by IR, 1 H, 13 C, 31 P, 119 Sn NMR, mass spectroscopy and elemental analysis. The structures have been determined for compounds 1, 2, 4, 5 and 8. Compound 2 exists as four symmetrically independent molecules in the crystalline lattice. Compounds 1, 4 and 5 form dimmers via intermolecular-P@OÁ Á ÁH-Nhydrogen bonds that in 1 is centrosymmetric. In compound 2, two dimmers were formed; each of them was produced between two adjacent independent molecules. In compounds 1, 2, 3, 4 and 8, containing five-and six-membered ring amine groups, 3 J(P,C aliphatic) > 2 J(P,C aliphatic). Compound 5 with seven-membered ring amine, similar to compounds 6 and 7 with acyclic aliphatic amines, shows that 2 J(P,C aliphatic) > 3 J(P,C aliphatic). Mass spectra of these compounds indicate the 4-F-C 6 H 4 CO + and 4-F-C 6 H 4 CN + fragments.
Acta crystallographica. Section E, Crystallographic communications, 2018
2-Amino-pyridine and citric acid mixed in 1:1 and 3:1 ratios in ethanol yielded crystals of two 2-amino-pyridinium citrate salts, . CHN·CHO () (systematic name: 2-amino-pyridin-1-ium 3-carb-oxy-2-carb-oxy-methyl-2-hy-droxy-propano-ate), and 3CHN·CHO () [systematic name: tris-(2-amino-pyridin-1-ium) 2-hy-droxy-propane-1,2,3-tri-carboxyl-ate]. The supra-molecular synthons present are analysed and their effect upon the crystal packing is presented in the context of crystal engineering. Salt is formed by the protonation of the pyridine N atom and deprotonation of the central carb-oxy-lic group of citric acid, while in all three carb-oxy-lic groups of the acid are deprotonated and the charges are compensated for by three 2-amino-pyridinium cations. In both structures, a complex supra-molecular three-dimensional architecture is formed. In , the supra-molecular aggregation results from N-H⋯O, O⋯H-O, O-H⋯O, N-H⋯O, N-H⋯O and C-H⋯O inter-actions. The mol-ecular conformation of the citrate ion...
2018 WJPR DS, DK SYNTHESIS, SPECTRAL CHARACTERISATION AND BIOLOGICAL.pdf
A potentially pentadentate Schiff base ligand H 2 L and their binuclear copper complexes have been prepared by the condensation of 2,6diformyl-4-methyl phenol, 2-aminophenol and o-phenylene diamine in the molar ratio 1:1:1. The Schiff base, H 2 L, ligand with N 3 O 2 pentadentate sites and can coordinate with two copper ions to form binuclear complexes after the deprotonation of the hydrogen atoms of the phenolic groups in all complexes. The ligand and the complexes were characterized by elemental analysis, conductivity measurements, 1 H NMR, 13 C NMR, IR, UV-Vis and ESR spectral studies. All the complexes are 1:1 electrolyte in nature. Redox behaviours of the complexes have been investigated by cyclic voltammetry. The copper(II) complexes were screened for antibacterial activity against Staphylococcus aureus, Escherichia coli and Bacillus subtilis and antifungal activity against Candida albicans, Aspergillus niger and Mucor indicus. The results revealed that the synthesised compounds were more potent against all the microbes under investigation. DNA interaction of Schiff base complexes was monitored by electronic absorption spectra. It was found that the prepared complexes could bind to DNA in an intercalating mode.
Structures of [HNEt3]+ and [Me3NCH2C6H5]+ salts of [7, 8-Ph2-7, 8-nido-C2B9H10]
… Section C: Crystal …, 1993
Experimental. K[7,8-Ph2-7,8-nido-CzB9Hlo], a light yellow solid, was prepared from 1,2-Ph2-1,2-closo-C2BIoHt0 by an analogous method to that which affords K[7,8-nido-C2BgH 12] from C2B 1oH 12 (Hawthorne, Young, Garrett, Owen, Schwerin, Tebbe & Wegner, ...
Six ammonium carboxylate salts are synthesized and reported, namely 2-propylammonium benzoate, C3H10N+C7H5O2, (I), benzylammonium (R)-2-phenylpropionate, C6H10N+C9H9O2, (II), (RS)-1-phenylethylammonium naphthalene-1-carboxylate, C8H12N+C11H7O2, (III), benzylammonium benzoate benzoic acid (1/1/1), C6H10N+C7H5O2+C7H6O2, (IV), cyclopropylammonium benzoate benzoic acid (1/1/1), C3H8N+C7H5O2+C7H6O2, (V), and cyclopropylammonium ea-cis-cyclohexane-1,4-dicarboxylate–ee-trans-cyclohexane-1,4- dicarboxylic acid (2/1/1), 2C3H8N+C8H10O4+2C8H12O4, (VI). Salts (I)–(III) all have a 1:1 ratio of cation to anion and feature three N—H...O hydrogen bonds which form one-dimensional hydrogen-bonded ladders. Salts (I) and (II) have type II ladders, consisting of repeating R43(10) rings, while (III) has type III ladders, in this case consisting of alternating R42(8) and R44(12) rings. Salts (IV) and (V) have a 1:1:1 ratio of cation to anion to benzoic acid. They have type III ladders formed by three N+—H...O hydrogen bonds, while the benzoic acid molecules are pendant to the ladders and hydrogen bond to them via O—H...O hydrogen bonds. Salt (VI) has a 2:1:1 ratio of cation to anion to acid and does not feature any hydrogen-bonded ladders; instead, the ionized and un-ionized components form a three-dimensional network of hydrogen bonded rings. The two-component 1:1 salts are formed from a 1:1 ratio of amine to acid. To create the three-component salts (IV)–(VI), the ratio of amine to acid was reduced so as to deprotonate only half of the acid molecules, and then to observe how the un-ionized acid molecules are incorporated into the ladder motif. For (IV) and (V), the ratio of amine to acid was reduced to 1:2, while for (VI) the ratio of amine to acid required to deprotonate only half the diacid molecules was 1:1.