Aliphatic long-chain

Capaccio et al. (2005) used the N-H fulleropyrrolidine derivative to couple long-chain biotin to the Cgo using the carbodiimide dicyclohexyl carbodiimide (DCC) in a pyridine/DMF/C C solvent mixture and reacting overnight at room temperature. This derivative was prepared using a hydrophobic, aliphatic long-chain biotin, but similar derivatives could be prepared... 

The major structural units of naturally occurring forms of both simple and complex lipids are the aliphatic, long chain monocarboxylic acids. These are of great importance because of their contribution to the physical and chemical characteristics of the compounds of which they are constituents. In the investigation of the structure of a lipid it may be necessary to determine not only the identity and amount of any fatty acids present but also their position within the molecule. 

Figure 13.77Se-NMR spectra of a selected aliphatic long-chain carboxylic acid derived pair of diaslereomers and detection of optical purity in a deuterated phenylacetic acid derivative12.

As a model experiment to see the effect of orthoesters in reducing the content of terminal carboxyl, aliphatic long-chain dicarboxylic acid and a large excess of various additives reacted in biphenyl at 250°C, and the rate constants of the pseudo-first-order reaction were compared. The reaction rate constant decreases in the order of tetraphenyl... 

Recent examples of analytes amenable to conductivity detectors include inorganic anions [33], aliphatic long chain quaternary ammonium compounds [34], and metaUocyanide complexes of Fe(II), Ni(II), and Co(III) [35], among others. 

GiovanneUi, D. and Abballe, F. Aliphatic long chain quaternary ammonium compound analysis by ion-pair chromatography coupled with suppressed conductivity and UV detection in lysing reagents for blood cell analysers. J. Chromatogr. A. 2005, 1085,... 

Kuhn-Roth method for C-methyl determination. Oxidation of organic compounds with chromic and sulfuric acids in such a manner that the C-methyl groups are converted to acetic acid which can be assayed volumetrically. The method has been modified and extended (1) to saturated fatty acids and alcohols containing up to about 20 carbon atoms, and (2) to aliphatic long-chain compounds of very high molecular weight. 

In the solid phase, the spectra of aliphatic long-chain carboxylic acids exhibit band patterns in the range 1345-1180cm (7.43-8.47pm). The number of these almost equally-spaced weak bands is related to the length of the aliphatic chain.For acids with an even number of carbon atoms, the number of bands observed equals half the number of carbon atoms. For acids with an odd number of carbon atoms, the number of bands is half (the number of carbon atoms plus one). Unfortunately, the band due to the C-0 stretching vibration also occurs in this region so that these weak bands may appear as shoulders. 

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