Structural affixes

Prefixes and Affixes. Prefixes are arranged alphabetically and placed before the parent name multiplying affixes, if necessary, are inserted and do not alter the alphabetical order already attained. The parent name includes any syllables denoting a change of ring member or relating to the structure of a carbon chain. Nondetachable parts of parent names include... 

Diketones and tetraketones derived from aromatic compounds by conversion of two or four SCH groups into keto groups, with any necessary rearrangement of double bonds to a quinonoid structure, are named by adding the suffix -quinone and any necessary affixes. 

For modern derrick and mast designs, API Standard 4F is the authoritative source of information, and much of this section is extracted directly from this standard. Drilling and well servicing structures that meet the requirements of API Standard 4F are identified by a nameplate securely affixed to the structure in a conspicuous place. The nameplate markings convey at least the following information ... 

Even with the diborylacetylenes illustrated by structures 39a-c, XRD data again show a shortening of the B—C bond as more electronegative groups are affixed to the boron centers but only a modest contraction of the C=C bond36 ... 

In addition, it has been shown that the performance of the four-electron 02 reduction depends not only on the diporphyrin structure, but also on the electrode material upon which it is absorbed. Attempts to affix these catalysts onto electrode surfaces other than EPG, whilst preserving the four-electron catalytic activity, have been largely unsuccessful.18 One explanation is that some axial coordination of the porphyrin by the EPG electrode occurs which plays an important role. 

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A Inclusion of structural information. The names described so far detail ligands and central atoms, but give no information on stereochemistry. The coordination number and shape of the coordination polyhedron may be denoted, if desired, by a polyhedral symbol. These are listed in Table 4.4. Such a symbol is used as an affix in parentheses, and immediately precedes the name, separated from it by a hyphen. This device is not often used. 

Structural prefixes used in These affixes ere italicized end separated from the rest of the name by hyphens. 

Attempts to produce descriptors similar to cis and trims for stereochemicidly more complicated coordination entities have tailed to achieve generality, and labels such as foe and mer are no longer recommended. Nevertheless, a diastereoisomeric structure may be indicated for any polyhedron using a configuration index as an affix to the name or formula. Finally, the chiralities of enantiomeric structures can be indicated using chirality symbols. 

Cyclic groups affixed to the ring structure have variable influences on complex formation. The addition of cyclohexyl groups does not seem to modify reactivity greatly, probably due to the... 

Callot and co-workers established in 1982 that iodorhodium(III) porphyrin complexes could be used as cyclopropanation catalysts with diazo esters and alkenes with c/.s-disubstituted alkenes these catalysts provide preferential production of cis(syn) disubsdtutcd cyclopropancs (syn/anti up to 3.3 with 1,4-cyclohexadiene) [72], More recently, chiral porphyrins have been designed and prepared by Kodadek and co-workers [73], and their iodorhodium(lll) complexes have been examined for asymmetric induction in catalytic cyclopropanation reactions [74,751. The intent here has been to affix chiral attachments onto the four porphyrin positions that are occupied in tetraphenylporphyrin by a phenyl group. Iodorhodium(III) catalysts with chiral binaphthyl (27, called chiral wall porphyrin [74]) and the structurally analogous chiral pyrenyl-naphthyl (28,... 

Salts and Esters of Acids. Neutral salts of acids are named by citing the cation(s) and then the anion, whose ending is changed from -oic to -oate or from -ic to -ate. When different acidic residues are present in one structure, prefixes are formed by changing the anion ending -ate to -ato- or -ide to -ido-. The prefix carboxylato- denotes the ionic group —COO-. The phrase (metal) salt of (the acid) is permissible when the carboxyl groups are not all named as affixes. 

Other names can be found in the literature for structure 10, namely, thiothiophthene and thiathiophthene. Thiothiophthene is questionable because, in systematic replacement nomenclature, the affix thio must indicate the replacement of oxygen by sulfur and not of carbon by sulfur. 

Class of molecule Functional group Structure Affix Example... 

Class of Functional 0,, A,.. . . Structure Affix Example molecule group r ... 

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