Nuclei 380 INDEX

Apart from a complete set of Beilstein s Handbuch and as many scientific journals with indexes as the Institution can aSFord, the following selected volumes are suggested as forming the nucleus of a small library for use in connexion with work in the organic chemistry laboratory. 

Several systems of nomenclature have been used for naphthalene, and many trivial and trade names are well estabUshed. The Chemicaly hstracts Index Guide is employed in this article. The numbering of the naphthalene nucleus is shown in (1) older practices are given in (2) and (3). 

The name adopted for this group of highly reactive (and in some circumstances intramolecularly self-reactive) compounds is intended to cover both arylmetal halides (halogen bonded to the metal) and haloaryl metals (halogen attached to the aryl nucleus). Individually indexed compounds are ... 

The great instability of 2-bromomethyl- and 2-chloromethyl-furans, often manifest as violent or explosive decomposition on attempted distillation, is reviewed. The furan nucleus is sensitive to traces of halogen acids, and decomposition becomes autocatalytic. Individually indexed compounds are ... 

Abrams JK, Johnson PL, Shekhar A, Lowry CA (2002) Different anxiogenic drugs activate a common, topographically distinct subpopulation of serotonergic neiu-ones in the rat dorsal raphe nucleus. Program No 75.1. 2002 abstract viewer/itinerary planner. Society for Neuroscience, Washington, http //sfn.scholarone.eom/itin2002/index.html. Cited 20 December 2004... 

In the older French literature, oxadiazoles are considered as a furan nucleus in which two CH groups are replaced by nitrogen atoms and therefore they are sometimes termed furadiazoles or furodiazoles. When these latter names are used, the relative positions of the nitrogen atoms are indexed by the letters a and... 

Branched substituents on the nucleus of PS impede the rotation but do not decrease the Tt to any great extent. The solubility parameter decreases as the size of the substituent alkyl groups increases. Thus although PS is not soluble in aliphatic hydrocarbon liquids, poly / cydohexylstyrene is soluble and serves as a viscosity index improver for lubricating oils. 

The spin of the electron has not been considered in this theory, but it hardly can introduce any appreciable change. We completely agree with Van Vleck s opinion that this theoretical value is more reliable than the result of the extremely difficult experimental determination of the index of refraction. The fact that for helium the experimental value c — 1 = 0,000074 is very different from the above value, is not consistent with a model in which one electron is close to the nucleus, the other farther away. It can be regarded as a further confirmation of Heisenberg s theory assuming equivalent orbits for the two electrons. 

The magnitude of the proportionality constant a depends on the strength of the coupling between nucleus and electrons. It can be determined by extrapolating the measured refractive index to infinite wavelength, as a result of the relations that exist between oo, 6 (dielectric constant) and a, which are... 

Of the four possible isomeric thiadiazoles (1-4), the 1,3,4-isomers (4) are by far the best-known.1,2The 1,2,4-thiadiazole nucleus is numbered as in 2 the nomenclature of the partly hydrogenated forms, d4-thia-diazolines (5) and A 2-thiadiazolines (6), and the fully reduced thia-diazolidine (7) follows the usual rules. In the older literature, 1,2,4-thiadiazoles are occasionally indexed as azosulfimes or as perthio-cyanates. 

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