Benzene-, sodium complex with

Silver fluoborate, reaction with ethyl bromide in ether, 46, 114 Silver nitrate, complexing with phenyl-acetylene, 46, 40 Silver oxide, 46, 83 Silver thiocyanate, 45, 71 Sodium amide, in alkylation of ethyl phenylacetate w ith (2-bromo-ethyl)benzene, 47, 72 in condensation of 2,4-pentanedione and 1 bromobutane to give 2,4-nonanedione, 47, 92 Sodium 2 ammobenzenesulfinate, from reduction of 2 mtrobenzenesul-finic acid, 47, 5... 

The first stable carbonylmetal-l//-azepine complex 25 (R = Et) was obtained by irradiating a mixture of ethyl 1 //-azepine-l-carboxylate (24, R = Et) and pentacarbonyliron(O) in tetrahy-drofuran (Method A).220 Hydrolysis of the complex with sodium methoxide gave azepine)tricarbonyliron(O) (26). Subsequently, the reaction of 24 with nonacarbonyldiiron(O) in warm benzene is reported to be a simpler and cleaner process.61 Both procedures fail, however, with alkyl-substituted l/Z-azepine-l-carboxylates. 

Opening of a bottle where some particles of lithium aluminum hydride were squeezed between the neck and the stopper caused a fire [68]. Lithium aluminum hydride must not be crushed in a porcelain mortar with a pestle. Fire and even explosion may result from contact of lithium aluminum hydride with small amounts of water or moisture. Sodium bis(2-methoxy-ethoxy)aluminum hydride (Vitride, Red-Al ) delivered in benzene or toluene solutions also may ignite in contact with water. Borane (diborane) ignites in contact with air and is therefore kept in solutions in tetrahydrofuran or in complexes with amines and sulfides. Powdered lithium borohydride may ignite in moist air. Sodium borohydride and sodium cyanoborohydride, on the other hand, are considered safe. ... 

The compound [(i7s-CsHs)Cr(NO)2] 2 was first prepared in low yields (<5%) by the reduction of (i75-CsHs)Cr(NO)2Cl with sodium tetrahydroborate in a two-phase water-benzene system.6 Recently, this complex was isolated in 75% yield from the zinc amalgam reduction of (i7s-C5Hs)Cr(NO)2Cl in tetrahydrofuran over a period of 21 hours.2 However, [07s-CsH5)Cr(NO)2]2 is synthesized most conveniently by the reduction of the above-mentioned chloro complex with sodium amalgam in benzene as outlined below. 

The synthesis of the zero-valent, 1,3-cyclohexadiene benzene ruthenium complex 196a has been mentioned as a coproduct of the cyclohexadienyl complex 236a in the reduction of the benzene ruthenium dication 235 with lithium aluminum hydride. Reduction of 235 with sodium borohydride in THF, however, gives only the air-sensitive, yellow-green ruthenium(O) complex 196a (118). This reaction has been generalized to... 

A related group of compounds is that of the gold(III) dimethyl(alkoxycarbonyl) complexes, accessible by the reaction of carbon monoxide with dimethyl(alkoxy)(triphenyl-phosphine)gold(III), which is prepared in situ from cw-[AuIMe2(PPli3)] and sodium alkoxide in methanol (equation 80)353,359. Thermolysis of the methoxycarbonyl complex in benzene leads to the reductive elimination of methyl acetate and ethane, indicating competition between the two modes of decomposition illustrated in Scheme 27. The reaction of the same complex with electrophiles such as hydrogen chloride proceeds with liberation of carbon monoxide and methanol, as illustrated in equation 81. 

In the first experiment, sodium iodide gave a complex with the major polyamine component in the mixture, iso-HMTT. Purity of the iso-HMTT was increased to more than 99% by selective complexation. This separation was done by stirring a benzene solution of the crude polyamine... 

An even more convincing demonstration of the complexation selectivity of sodium iodide for the branched tetramine, iso-HMTT, was obtained in the second experiment. The polyamine mixture in that instance contained 9.2% iso-HMTT along with 82% n-HMTT and 9.1% of the combined cyclic TMTT isomers. The sample also contained traces of TMED and PMDT (Compounds 1 and 2 in Table I) it represents a typical N-permethylated commercial TETA fraction. In this case, complexation with ca. 7.7 mole % sodium iodide suspended in benzene gave a polyamine chelate that still contained 97.3% iso-HMTT. 

The data in Table V were obtained by sequential treatment of the initial sample with sodium iodide and lithium chloride. Complexation with sodium iodide was done in a heptane-benzene slurry. The sparingly soluble sodium iodide chelate was isolated by filtering the mixture. The remaining solution was concentrated, and the residue obtained was contacted with lithium chloride in pentane. After stirring this heterogeneous mixture, a solid lithium chloride chelate complex was isolated by filtration. Decomposition of the alkali-metal salt complexes followed by recovery and analysis of the polyamine components showed that the sodium iodide complex contained 82.6% n-HMTP while the LiCl complex contained 94.8% N,N -c-PMPP. Table V shows that the initial polyamine sample contained 48.8 and 11.4% of these ligands, respectively. 

Ion flotation in the presence of surfactants for the treatment of rinses and separation of metal ions is of interest since the sixties [327, 328]. Here, we take only a few examples. The recovery of silver ions from highly diluted solutions is possible by forming a silver-thiourea complex in form of a colloidal precipitate (sublate) followed by sublate flotation with sodium dodecyl benzene sulfonate [329]. Skiylev [330] has developed methods for the removal of non-ferrous metal salts from waste waters. Subject of the investigations were 0.01 - 0.001% solutions of ferrous metal salts. Typical anionic surfactants (alkyl sulfates, alkyl phosphates, alkyl xanthogenates of potassium) or cationic surfactants (quaternary ammonium salts) were used as collectors in ion flotation from diluted solutions. At certain pH, a sublate containing a non-ferrous metal ion was formed, followed by a sublate film formation at the surface due to the rise of the complexes with air bubbles stabilised by the surfactants. 

Indeed high diastereomeric ratios of 86 14 were obtained for the cationic (benzene)Ru complexes 3.15a/3.15b prepared from the reaction of [(C6H6)Ru( -Cl)2]2 with the sodium salt of anion 3.16 (Figure 3.4). The X-ray crystal structure of one of the diastereomers was determined. The NMR of 3.15 recorded at —80°C showed the same 86 14 ratio of the two diastereomers, comparable to that of the crude material at room temperature. These data suggested that the configurational stability of the metal centre is very low. Thus the thermodynamic ratio was established rapidly even at low temperature. 

A mixture of ionophoric polyether antibiotics produced by Streptomyces lasaliensis, from which the components A to E have been separated. L. exert antibacterial and antiviral (HIV) activities, LD50 (mouse p.o.) 146 mg/kg. L. A mp. 110-114°C, (aJo -7.5° (CH3OH), which preferentially forms complexes with divalent cations, is formed biosynthetically by the polyketide pathway from five acetate units, four propionate units, and three butanoate units, the benzene ring arises through cyclization. L. A (Bovatec ) in the form of its sodium salt (Avatec ) is used in fowl breeding as a coccidostatic. 

Fig. 2 Space filling representation of a receptor comprised of (benzene)Ru complexes and the ligand L3 with a sodium ion (left) or a lithium ion (right) in the binding pocket. Larger cations do not bind to the receptor because they are efficiently blocked by the arene 7r-ligands...

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