SEELS

Bagus P S, Bauschlicher C W Jr, Nelin C J, Laskowski B C and Seel M 1984 A proposal for the proper use of pseudopotentlals In moleoular orbital oluster model studies of ohemisorptlon J. Chem. Phys. 81 3594-602... 

Seel M and Bagus P S 1983 Ah initio cluster study of the interaction of fluorine and chlorine with the Si(111) surface Phys. Rev. 28 2023-38... 

F. Seel, Atomic Structure and Chemical Bonding, 4th edn. translated and revised by N. M. Greeiwood and H. R Stadler, Methuen, London, 1963, pp. 83-4. 

Sulfonic acids containing nitrogen have long been implicated as essential intermediates in the synthesis of H2SO4 by the lead-chamber process (p. 708) and, as shown by F. Seel and his group, the crucial stage is the oxidation of sulfite ions by the nitrosyl ion NO+ ... 

Seel and Nogradi were probably the first to suspect that the formulation of the thiol as azidodithiocarbonic acid was incorrect. In a study of the reaction of nitrosyl chloride with azides they found that... 

Seele, /. soul shaft (of a blast furnace) core (as of a rope or cable) bore (of a tube). Seelenruhc,/. tranquillity mental rest. See-iicht, n. marine phosphorescence, -luft, /. sea air. -moos, n. sea moss, carrageen, -pflanze,/. marine plant, sea plant, -rose,/, water lily (esp., Nymphaea). -salz, n. sea salt, -sand, m. sea sand, -schiick, m. sea ooze, -seide,/. sea silk (from algae) byssus silk, -tang, m. seaweed (esp., Fucua), sea tang, -tier, n. marine animal -wasser, n. sea water. 

A solution or dispersion consisting of 20.1 g (0.1 mol) of 7-chloro-p-fluorobutyrophenone, 19.8 g (0.2 mol) of 4-methylpiperidine end 0.1 g of potassium iodide in 150 ml toluene is heated in a seeled gless tube for 15 hours at 100°C to 110°C. The potassium iodide and the 4-methylpiperidine hydrochloride formed in the reaction are separated by filtration and the solvent removed from the filtrate by evaporation In vacuum on a steam bath. The residue is distilled and the fraction obtained at 120°C to 125 0 and at a pressure lower than 0.1 mm Hg is collected. The basa Is dissolved in ether and the 4-fluoro-7-(4-methylpiperidino)-butyro-phenone precipitated as the hydrochloride. The reaction product is purified by recrystallization in ethanol/ether. 

Divide any plain surface A, II, C, 1), along a line a-l> into an even number, i mid sufficiently small strips, <1, whom ordinates are li, h2, h3, b)t h5. . . . hn-i, h eonsidering contours bet ween three ordinates as parabolic curves, then for seel ion... 

A solution of nitrous acid in sulfuric acid exists as the equilibrium indicated in Scheme 2-15, as was shown by Seel and Winkler (1960), and by Bayliss et al. (1963). These authors determined the equilibrium concentration of [HN02] and [NO+] in various acid concentrations spectrophotometrically. They found that in aqueous sulfuric acid containing more than about 57% w/w H2S04 the equilibrium of Scheme 2-15 is predominantly on the right-hand side. This equilibrium and the problem of the potential intermediate nitrosoacidium ion (H20-N0), which is the proton addition product of HN02, will be discussed in Section 3.2. 

The UV absorption spectra of sodium nitrite in aqueous solutions of sulfuric and perchloric acids were recorded by Seel and Winkler (1960) and by Bayliss et al. (1963). The absorption band at 250 nm is due either to the nitrosoacidium ion or to the nitrosyl ion. From the absorbancy of this band the equilibrium concentrations of HNO2 and NO or H20 —NO were calculated over the acid concentration ranges 0-100% H2S04 (by weight) and 0-72% HC104 (by weight). For both solvent systems the concentrations determined for the two (or three) equilibrium species correlate with the acidity function HR. This acidity function is defined for protonation-dehydration processes, and it is usually measured using triarylcarbinol indicators in the equilibrium shown in Scheme 3-15 (see Deno et al., 1955 Cox and Yates, 1983). 

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