Pyrroles terms Links

Figure 1 shows the general structure of calixpyrroles. The basic ring structure resembles that of porphyrin. In the past, four pyrrole rings linked by methylene groups to form colourless macrocycles (that feature in the biosynthetic pathways to pyrrole pigments) were referred to as porphyrinogens [22], The term calix[4]pyrrole was later ascribed to these macrocycles and their synthetic derivatives because of their relation to calix[4]arenes [23],... 

Analysis of the products indicated that these new macrocycles consisted of six pyrrolic subunits linked in a (1.1.1.1.1.1) fashion by six methine subunits. As such, they may be referred to as being [26]hexaphyrins-(l.l.l.l.l.l) in the Franck-type nomenclature used in this book. Here, the key macrocycle name, hexaphyrin, came from Gossauer. Indeed, because this investigator viewed products 7.9-7.12 as being the next higher porphyrin homolog in the porphyrin-pentaphyrin series coined the term hexaphyrin for this class of macrocycles. 

Three consecutive 3,3 -linked pyrroles were designed in 183 and 184. These compounds presented two chirality axes and a fixed chirality center. If the barriers about the axes were high enough, four diastereomers should be observed by NMR. The two axes are not equivalent in terms of rotational barriers since in one case one finds two flanking substituents and in the other case one finds three flanking substituents. Obviously in the case of the axis with only two flanking substituents, the barrier is too low to be... 

Mediators covalently bound to or complexed with conducting and other polymers have been termed wires. Wired enzyme glucose electrodes were produced by the electropolymerization of (ferrocenyl)amidopropyl pyrrole (FAPP Fig. 6, structure 1) in the pre.sence of glucose oxidase [95], FAPP was synthesized by using l,r-carbonyl diimidazole to link ferrocenecarboxylic acid to A -(3-aminopropyl) pyrrole. The electropolymerization of Os(2,2 -bipyridine)2(3-pyrrol-l-ylmethylpyridine)Cr (Fig. 6, structure 2), N-methylpyrrole, and pyrrole-modified... 

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