Sodium complexes

The addition product, C QHgNa, called naphthalenesodium or sodium naphthalene complex, may be regarded as a resonance hybrid. The ether is more than just a solvent that promotes the reaction. StabiUty of the complex depends on the presence of the ether, and sodium can be Hberated by evaporating the ether or by dilution using an indifferent solvent, such as ethyl ether. A number of ether-type solvents are effective in complex preparation, such as methyl ethyl ether, ethylene glycol dimethyl ether, dioxane, and THF. Trimethyl amine also promotes complex formation. This reaction proceeds with all alkah metals. Other aromatic compounds, eg, diphenyl, anthracene, and phenanthrene, also form sodium complexes (16,20). 

Cyclohexyl[l 5]crown-5, potassium complex equilibrium constant, 7, 742 (73MI52101) Cyclohexyl[15]crown-5, sodium complex equilibrium constant, 7, 742 (73MI52101) Cycloocta[ 1,2-c 5,6-c ]difuran H NMR. 4. 564 (70JA973) Cyclopenta[h][2.2.4]cyclazine... 

H-Benzo[a]carbazole, 4,4a,5,l 1,1 la,l Ib-hexahydro-synthesis, 4, 283 Benzo[b]carbazole, N-acetyl-photochemical rearrangements, 4, 204 Benzo[/]chroman-4-one, 9-hydroxy-2,2-dimethyl-synthesis, 3, 851 Benzochromanones synthesis, 3, 850, 851, 855 Benzochromones synthesis, 3, 821 Benzocinnoline-N-imide ring expansion, 7, 255 Benzocinnolines synthesis, 2, 69, 75 UV, 2, 127 Benzocoumarins synthesis, 3, 810 Benzo[15]crown-5 potassium complex crystal stmcture, 7, 735 sodium complex crystal stmcture, 7, 735 Benzo[ 18]cr own-6 membrane transport and, 7, 756 Benzo[b]cyclohepta[d]furans synthesis, 4, 106 Benzocycloheptathi azoles synthesis, 5, 120... 

The interesting N6-case (154), incorporating three linked 1,10-phenan-throline moieties, has also been prepared as its sodium complex. An... 

In contrast, the sodium complex [Na(AsPh2)(dioxane)]x is polymeric in the solid state [Na-As = 2.962(4), 2.937(4) A] (25). This complex was synthesized by the rather unusual method of sodium reduction of a diarsine ... 

Fig. 12 Sodium complexed perepoxides III and IY and isotope effect negating zwitterion V as an intrazeolite intermediate.

Iron tartaric acid -sodium complex solution KC4H306)3Fe]Na6 EWNN Good solvating properties, extremely high salt concentration, slight oxidative degradation, coloured (green)... 

Compound [25] was thus shown to have an unusual affinity for Ag+ cations. X-ray crystallographic determination of the structures of the free ligand, sodium and silver complexes were carried out and are shown in Fig. 17. The Ag-Fe distance in the silver complex of [25] is only 3.37 A, whereas the Na-Fe distance in the sodium complex is 4.39 A. This evidence together with the FAB MS data and UV spectroscopic data suggests that there may be an interaction between the silver cation and the iron present in the ferrocene moiety. 

A peculiar feature of sodium complexes 8 and 9 is their exceptionally high stability, which allows a high catalytic efficiency... 

Complexation of sodium to the persulfoxide A (Fig. 13B) appears to inhibit intramolecular hydrogen abstraction to form the hydroperoxy sulfonium ylide (B in Fig. 13A) and allows a direct reaction of 12 with the sodium-complexed persulfoxide, (A in Fig. 13B) to compete. Consistent with this suggestion is the observation that the formation of 13CHO that emanates from the hydroperoxy sulfonium ylide by Pummerer rearrangement and subsequent cleavage is completely suppressed during photo-oxidations of thiolane, 13, in NaMBY ... 

Note added in proof Crystal structure analysis of the lithium complex and of a sodium complex of an analogue show similar peptide bonds) quite different from any of the previous postulates (Karle, I. L., Karle, J., Wieland, Th., Burger-meister, W., Faulstich, H., Witkop, B. Proc. Natl. Acad. Sci. 70, 1836(1973)). 

The conformation of the ligand differs from that in the sodium complex. The change is mainly in the torsion angles about two carbon-oxygen bonds, corresponding to a displacement of two alkyl carbon atoms, so that these are all on one side of the oxygen plane in the potassium complex. 

Figure 22 The molecular structure of the binuclear sodium complex of the tricyclic cryptand (110) (reproduced with...

The structure of (141a)Ca(a04)2 has been solved and shows a close similarity to that of the sodium complex. This is not surprising due to the close similarity in ionic radii between sodium and calcium.556... 

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