C/A Nomenclature

FIGURE 5.5 Application of C/A nomenclature rules to [Co(CN)2(NH3)2(H20)2]+. The numbers are the CIP priority numbers, and the overall chirality is C. (See the color version of this hgure in Color Plates section.)... 

The second is based on the geometry of the molecule and makes use of the skew-lines convention it is usually applied only to octahedral complexes. The two enantiomers are identified by the symbols A and A in this system. The C/A nomenclature is not required for those chelate complexes where the skew-lines convention is completely unambiguous (see Sections IR-9.3.4.11 to 9.3.4.14). 

Fig. 9. Control valve and actuator (a) nomenclature (b) fail-open (F/O) or air-to-close (A/C) action and (c) fail-closed (F/C) or air-to-open (A/O)...

Appendix A Nomenclature of Polyfunctional Organic Compounds A-1 Appendix B Acidity Constants for Some Organic Compounds A-8 Appendix C Glossary A-10 Appendix D Answers to In-Text Problems A-30... 

Porphyrins are formally derived from the porphin (1) nucleus by substitution of some or all peripheral positions with various side chains. In the classical system of nomenclature T, introduced by H. Fischer,Sc the peripheral /5-pyrrolic positions are numbered front 1 to 8 and the methine positions (also named meso positions) between the pyrrole rings are designated a, //, y, and 5. The rings are lettered clockwise A, B, C, and D. The classical nomenclature was in the past more and more displaced by a nomenclature which numbers all the carbon... 

The P-atom in sarin (9.84), soman (9.85), and tabun (9.87) is a stereogen-ic center, allowing for stereoselective enzymatic hydrolysis [162], This aspect has been extensively investigated for soman, which exists as four stereoisomers by virtue of the presence of a second stereogenic center (C-atom). These stereoisomers are usually designated as C(+)P(-), C(-)P(+), C(+)P(+), and C(-)P(-), where C(+/-) refers to the 1,2,2-trimethylpropyl moiety and P(+/ ) to the P-atom. Such a nomenclature may be convenient but has no implication for the absolute configuration. The C(+)P( ) and Cf-)P(-) epimers are the more active toward acetylcholinesterase and, hence, the more toxic ones. In contrast, the C(+)P(+) and C(-)P(+) epimers are preferentially hydrolyzed... 

Lawton, M. P., J. R. Cashman, T. Cresteil, C. T. Dolphin, A. A. Elfarra, R. N. Hines, E. Hodgson, T. Kimura, J. Ozols, I. R. Phillips, R. M. Philpot, L. L. Poulsen, A. E. Rettie, E. A. Shephard, D. E. Williams and D. M. Ziegler. A nomenclature for the mammalian flavin-containing monooxygenase gene family based on amino acid sequence identities. Arch. Biochem. Biophys. 308 254-257, 1994. 

Figure 5.5.12-1 Alternate nomenclatures for the retinoids associated with vision. A the Karrer based nomenclature adopted by the IUPAC. B the systematic nomenclature proposed by Frickel and others. C a second systematic nomenclature found in the literature. D the modified pictograph of the IUPAC nomenclature used in this work.

Figure 7.2 Conformational interconversion of the five-membered diamine chelate ring of [Co(en)(NH3)4]3+. (a) Nomenclature of the torsional angeles. (b) Representation of the extreme, intermediate and transition state conformations, (c) Graphical representation of the potential energy surface (see text). Taken from [180]. John Wiley and Sons, Inc, 1987.

C A index names are chemicals names issued according to the nomenclature standards of the Chemical Abstracts Service (http //www.cas.org). 

Changes of each component of the scattering tensor of the unit cell can be directly observed. The arrangement of the crystal with regard to the spectrometer is described by a nomenclature recommended by Porto et al. (1966). In this system, a(bc)d stands for irradiation in a direction by radiation polarized in b direction, Raman radiation polarized in c direction is observed in d direction. Here, a, b, c, d indicate any crystal axes. 

The metakaolins were prepared by calcination of the < 2pm fraction at 600, 700, 800 and 900°C with a heating rate of 10°C min. Calcination was maintained for 10 h, under air atmosphere. The solids obtained were named MK-T, where T indicates the calcination temperature. The metakaolins were treated with 6M HCl solutions using the following conditions 6 hours at room temperature and 6, 12, 18 and 24 hours at 90 C, under reflux conditions. 6.0 g of the metakaolin were suspended in 180 mL of the acid solution and stirred during the times indicated. The leached samples were separated by centrifugation, washed until free of chloride anions and dried at 50"C. The nomenclature employed for these samples is as follows MK-T-HCl-C-T -t, C being the acid concentration, 7 the treatment temperature and t the time of the treatment. 

International Union of Pure and Applied Chemistry, Organic Chemistry Division, Commission on Nomenclature of Organic Chemistry, Nomenclature of Organic Chemistry Sections A, B, C, A E, F, and H, J. Rigaudy and S. P. Klesney, Eds., Pergamon, Oxford, 1979. t The Chemical Society, Journal of the Chemical Society, Notices to Authors No. 4 (1968). 

---