Borates, inositol

B-C bonds, 3, 97 B-N bonds, 3, 97 B-O bonds, 3,94 B-P bonds, 3, 97 B-Si bonds, 3, 97 oxo acid anion complexes, 3, 96 Borates, alkoxo-, 3, 94 Borates, amidotrihydro-, 3,92 Borates, aryloxo-, 3, 94 Borates, carboxylato-, 3,96 Borates, catechol, 3,95 Borates, chlorosulfato-, 3,97 Borates, dicarboxylato-, 3,96 Borates, dipyrazol-l-yl-, 3, 92 Borates, halogeno-, 3,92 Borates, halogenohydro-, 3,90 Borates, hydro-, 3,90 Borates, hydrohydroxo-, 3,90 Borates, hydropyrazol-l-yl-, 3, 92 Borates, hydroxo-, 3,94 Borates, hydroxycarboxylato-, 3,96 Borates, inositol, 3, 95 Borates, monoalkyl-, 3, 92 Borates, monophosphido-, 3, 92 Borates, peroxohydroxo-, 3, 94 Borates, polyol, 3, 95 Borates, pyrrol-l-yl-, 3, 92 Borates, sulfato-, 3, 97 Borates, tetrabromo-, 3, 92 Borates, tetrachloro-, 3, 92 Borates, tetrafluoro-, 3, 92 minerals, 6, 847 Borates, tetrahalogeno-mixed, 3, 93 nB NMR, 3, 92 Borates, tetraiodo-, 3, 92 Borates, tetranitrato-, 3, 96 Borates, tetraperchlorato-, 3, 97 Borates, tripyrazol-l-yl-, 3, 92 Borax, 3,101 Borazines... 

Borates, inositol, 95 Borates, monoalkyl-, 92 Borates, monophosphido-, 92 Borates, peroxohydroxo-, 94 Borates, polyol, 95 Borates, pynol-l-yl-, 92 Borates, sulfato-, 97 Borates, tetrabromo-, 92 Borates, tetrachloro-, 92 Borates, tetrafluoro-, 92 Borates, tetrahalogetio-mixed, 93 B NMR, 92 Borates, tetraiodo-, 92 Borates, tetranitrato-, 96... 

The more stable boron chelates can be isolated even from aqueous solution, whereas those of lower stabilities are only accessible from non-aqueous media. Catechol- and inositol-borates (3, 5 and 6) possesses a well-defined monomeric structure,75 whereas those obtained from monosaccharides and alditols are polymeric.121 A crystal structure determination122 has been carried out for sodium scyUo-inositol diborate (6). 

Speculation is made about why epi-inositol flips into the triaxial form to form a tridentate complex with borate, but complexes without flipping with metal ions. The distances between the three axial oxygen atoms are similar to those between the three oxygen atoms in the ax-eq-ax sequence. However, in the triaxial borate complexes (3) the bonds are tetrahedral if one were formed at the ax-eq-ax oxygen atoms, the bonds would be considerably distorted. However, the angles have much less effect on complex formation with cations which does not involve covalent bonds. 

Wu, J., N. Kamimura, T. Takeo, S. Suga, M. Wakui, T. Maruyama and K. Mikoshiba, 2000, 2-Aminoethoxydiphenyl borate modulates kinetics of intracellular Ca(2+) signals mediated by inositol 1,4,5-trisphosphate-sensitive Ca(2+) stores in single pancreatic acinar cells of mouse, Mol Pharmacol, 58, (6), pp. 1368-1374... 

From the change of pH caused by successive additions of cyclitols to a borate solution, the equilibrium constants of complex formation have been calculated66 they show that the complexes are formed from cyclitol and borate in a 1 1 ratio. The stability of the tridentate borates depends on the steric disposition of the free hydroxyl groups in the complex the more of these in axial positions, the less stable the complex. This is illustrated by the values of the equilibrium constant in the following two series which are arranged by decreasing number of free axial hydroxyl groups in the complex scyWo-quercitol, 5.0 epf-quercitol, 310 m-quercitol, 7900 myoinositol, 25 epi-inositol, 700 and m-inositol, 1.1 X 106. When the constitution of a cyclitol allows the formation of both the tridentate and the classical, cis-1,2 type of complex, the former predominates. 

Tables II to X give the melting points and, where applicable, the optical rotations of the inositols, inososes, inosamines, and quercitols, and of all of their known O-substituted derivatives. Anhydroinositols, although not substitution products in the strict sense, are included, as are the carbonyl-functional derivatives of the inososes. Halogen- and nitro-substituted cyclitols, and the C-methyl-inositols and their derivatives, are not included most of these compounds are referred to in the text. The derivatives are arranged in the following order salts (inosamines) or functional derivatives (inososes), carboxylic esters, borates, nitrates, sulfonic esters, phosphates, glycosides, acetals (and Schiff bases), ethers (and IV-alkyl derivatives), and anhydrides.

InsH 3)] 96 is proved by B NMR spectroscopy [40]. The borate ester of all-m-cyclo-hexane-l,3,5-triol has a chemical shift of — 18.1 ppm, the ester of epi-inositol a chemical shift of — 19.4 ppm. 

A comparison of the absolute mobilities during electrophoresis in these two electrolytes, respectively, shows that, in all cases except those of epf-inositol and, probably, methyl a-n-mannofuranoside, the values are appreciably smaller in the solutions containing sulfonated benzeneboronic acid. The extent of the decrease is probably too great to be due solely to the difference in ionic radii of pairs of the migrating substances. Although different degrees of ionization of such pairs will contribute to this effect, it also seems that sulfonated benzeneboronic acid has, in general, a lower affinity for diols than has the borate ion.. ... 

The lower affinity of sulfonated benzeneboronic acid for diols, together with this entropy effect, probably also explains the observation that, in contrast to borate solution, no contribution to mobility arises from such a diol grouping as that on C-4 and C-6 in n-glucopyranose (shortest 0-0 distance, 2.51 A.). However, there is an indication that sulfonated benzeneboronic acid reacts with cfs-l,3-diol groupings of six-membered ring compounds when, in the most stable conformation, the two hydroxyl groups are axially disposed [as in epz-inositol, M CPhE) 1.8J. 

Figure 8. Representations of (A) c s-iru>sitol borate and (B) the cpi-inositol chair inversion to form the epi-inositol borate...

Interactions which influence solution behavior of nonionic polysaccharides in aqueous electrolytes were explored in Raman spectral investigations of a sequence of model systems The studies included interactions of Group II cations with ethylene glycol, the cyclohexane diols, 1,5-anhydroribitol, and a number of Inositols, as well as interactions between inositols and the borate anion. Different levels of interaction were identified. 

The structure of a rhenium(V) complex with l,3,5-trideoxy-l,3,5-tris (2-hydroxybenzylamino)-c /i -inositol has been described, and the metal ion sequestering abilities of borate esters of 2-amino-2-deoxy-D-gluconate and 2-amino-2-deoxy-D-galactonate have been studied. The largest effects were measured upon adding Cd(ll) or Ni(II) to the borate - 2-amino-2-deoxy-D-gluconate system. A ribonucleoside technetium chelate prepared from 2, 3 -diamino-2, 3 -dideoxyadenosine is mentioned in Chapter 20. 

Capillaiy zone electrophoresis (c.z.e.) separation of anions including carboxylates of sugar acids was achieved in a 3 minute run with indirect u.v. detection using a complex co-ion as an electroosmotic flow modifter that dynamically coats the capillary walls. " Inositol mono-, bis-, tris- and hexakis-phosphates were similarly separated using a tetradecylammonium bromide - borate buffer combination. Inositol 1- and 2-phosphate were easily separated." ... 

NMR spectroscopy has been used to determine the thermodynamics of borate ester formation by three readily grafted carbohydrates. Boron specia-tion in borate-poly(amido amine) dendrimer has been performed using B NMR spectroscopy. The role of inositol in the synthesis of FAU- and LTA-type zeolites has been investigated using H, C, Na, and Al NMR spectroscopy. Ulvan-boron complex formation has been studied using B and NMR spectroscopy. The complexation of borate ions and humic acid fractions has been analysed with B and H NMR spectroscopy. ... 

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