Anions multiple

Multiple anions are named by using the suffixes -diide , -triide , etc., with such locants as may be necessary, and without eliding terminal e . No other suffixes denoting functional groups may be used with -ide endings functional groups must be indicated by prefixes, as in (194)-(200). 

As the latest example in this section, the synthesis of clavolonine [314] by the group of Evans is mentioned [315]. Through the action of a multiple anionic domino reaction a functionalized linear carbon chain was converted into the polycyclic architecture of the natural product. 

Including multiple anions into speciation calculations greatly increases their complexity because the anions also imdergo multiple ion pairing reactions. The most important involve the formation of ion pairs with the major ions, Na, Ca, Mg, ... 

Langer, P. Doring, M. Seyferth, D. Gorls, H. Synthesis of nitrile oligomers through multiple anion capture reactions of allene dianions. Eur.J. Org. Chem. 2003, 1948-1953. 

Figure 3. Schematic of the efficiency of effector (+) capture by a surface carrying multiple anionic sites. Transfer from one site to the other invoices two-dimensional translocations, thus leading to a much improved efficiency and timing of catch at any given site.

One type of anion exchange column used for nonsuppressed applications is the ION-20 from Interaction Co. It is a quaternary ammonium group on a styrene-divinyl benzene polymer in the form of 9 pm particles with an exchange capacity of 100 peq/g. Figure 24-14 is an example of a multiple anion separation. 

The market in your area is being targeted by a company that is selling recycled antifreeze at a very low price. You are being hired to check this antifreeze to see what it contains in the way of additives. You have never done this before, but you know that ion chromatography is the best way to scan for multiple anions. To check your technique and to provide quality assurance to your employer, you are going to examine a sample of nonrecycled antifreeze by ion chromatography. 

An interesting case consistent with this model is the rearrangement of 1-phenyl-l-trimethylsilyl-2-re/-t-butyldimethylsilylhydrazine (3) (26). Because this compound contains two different organosilyl substituents, multiple anionic rearrangements are possible. Loss of a proton from 3 produces the anion 3a, which can retu range to 4a. The latter can become protonated to 4 or, alternatively, to 5a, which can give upon protonation 5 [Eq. (10)]. Note that two sequential rearrangements are necessary to form 5. 

Although several theoretical studies have proposed structures for novel receptors based on multiple anion-jt interactions, to date, and to the best of our knowledge, the experimental realization of such type of receptors and their anion-binding properties have not been reported. The few experimental studies that have attempted the experimental quantification of the anion-n interaction in solution have produced very different and even opposite results. 

The presence of a hydophobic cavity and multiple anionic ligand groups in the / (jra-sulfonato-calix[n]arenas coupled with their high aqueous solubility, made these molecules the derivatives of choice for the study of binding of organic cations, usually containing ammonium functions. 

Acceptance of ion chromatography for anion analysis was very rapid, primarily due to the lack of alternative methods that could determine multiple anions in a single analysis. However, the simation regarding the analysis... 

Due to the fact that complexing results in multiple anions and/or cations, activity coefficients for such species must be calculated using multicomponent methods even for simple binary solutions. The methods presented in Chapter V are suitable for use. 

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