Solution in air

Digest the solid salt with aqueous NH4NCS, wash thoroughly with H2O and dry at 110° in the dark. Soluble in dilute aqueous NH3. Dissolve in strong aqueous NH4NCS solution, filter and dilute with large volume of H2O when the Ag salt separates. The solid is washed with H2O by decantation until free from NCS ions, collected, washed with H2O, EtOH and dried in an air oven at 120°. Alternatively dissolve in dilute aqueous NH3 and single crystals are formed by free evaporation of the solution in air. [J Chem Soc 836, 2405 1932 IR and Raman Acta Chem Scand 13 1607 1957 Acta Cryst 10 29 1957.]... 

The phenylhydrazones of 2-[(2-alkenyl)amino]-3-formyl-4//-pyrido-[1,2-n]pyrimidin-4-ones 242 underwent a thermally induced intramolecular 1,3-dipolar cycloaddition leading to a mixture of tetracyclic compounds 243 and 244 at room temperature or to 244 under reflux (96T901). Derivatives 243 were not stable and converted to compounds 244 gradually on standing or on heating their ethanolic solutions in air. The ( )-hydrazones 245 could be isolated only in the case of... 

Fig. 10. The mole fraction of carbon dioxide in saturated solutions in air at — 110°C (above the lower critical end point). The full line is the experimental curve of Webster and the dashed curves are 1, an ideal gas mixture 2, an ideal gas mixture with Poynting s correction and 3, the solubility calculated from Eq. 8 and the principle of corresponding states.

Figure 17.17 Schematic representation of a single-compartment glucose/02 enzyme fuel cell built from carbon fiber electrodes modified with Os -containing polymers that incorporate glucose oxidase at the anode and bilirubin oxidase at the cathode. The inset shows power density versus cell potential curves for this fuel cell operating in a quiescent solution in air at pH 7.2, 0.14 M NaCl, 20 mM phosphate, and 15 mM glucose. Parts of this figure are reprinted with permission from Mano et al. [2003]. Copyright (2003) American Chemical Society.

Many more Cr(V) than Cr(IV) compounds have been characterized. The Cr(V) complexes 4 are relatively stable in aqueous solution in air. Often R, =R2=Et in 4 has been... 

Tin dissolves in solutions of oxidizing salts such as potassium chlorate or potassium persulfate. The metal does not react with neutral salts in aqueous solutions. In air, tin reacts slowly with neutral salts. 

Fig. 1.3.2 TEM image of a carbon replica of monodispersed Co304 particles obtained on aging for 4 h at I00°C in 10-2 mol dm-3 Co(ll) acetate solutions in air. (From Ref. 1.)...

As oxyhemoglobin solutions in air are liable to contain appreciable amounts of deoxyhemoglobin, it is astonishing that a reaction of OJ with deoxyhemoglobin has apparently not been considered ... 

Cyanide. Sodium cyanide. [CAS 143-33-9]. NaCN. white solid, soluble, very poisonous, formed (1) by reaction of sodamide and carbon at high temperature, (2) by reaction of calcium cyanamide and sodium chloride at high temperature, reacts in dilute solution in air with gold or silver to form soluble sodium gold or silver cyanide, and used for this purpose in the cyanide process for recovery of gold. The perceniage of available cyanide is greater than in potassium cyanide previously used. Used as a source of cyanide, and for hydrocyanic acid. 

A small number of 3-hydroxy-2-phenyl-3//-indole 1-oxides (128) have been prepared [80JCS(P2)339] from the 3-substituted (R = Me or Ph) indoles (127) by stirring benzene solutions in air. Reduction with sodium borohydride gave the indolines 129 which, with ethanolic hydrogen chloride, gave back the indoles (127). The similar acid-catalyzed dehydra-... 

Radiolysis of water (and water solutions) in air produces carbon dioxide anion radicals (Morkovnik Okhlobystin 1979). Hydrated electrons, which are generated during the... 

Oxidation of iminobisbenzylisoquinolines results first in a benzoylimino compound, and, under stronger conditions, dehydrogenation to a benzoyliso-quinoline. An example is the conversion of thalibrunimine (27, Section II,A,4) to oxothalibrunimine (254, Section II,C,86) by refluxing a benzene solution in air, and to thalictrinine (143) by heating with Pd/C in p-cymene (81) (Section... 

In the lower panel of Fig. 10 we show the Sc 2p core-level photoemission spectrum of a UHV-prepared film of Sc2 C84 [34]. Analogous data, but from films prepared by dropping from a solvent solution in air, were used in [32] to argue that, as the binding energy of the Sc 2p spin-orbit split components is lower than in Sc203 (a trivalent Sc standard), the Sc ions in the endohedral fullerene are divalent. 

Among the photodegradation products of l-alkyl-3,3-dimethylindolinospiro-naphthoxazines in toluene solution in air are the l-alkyl-3,3-dimenthyloxindole and... 

In preparing an alkaline solution (for ionization difference spectra measurement), the alkali is added to a neutral solution immediately before recording the spectrum. Do not stir alkaline solutions in air for an extended period of time. 

An oxidation-cyclization was observed to take place on an indole enamine by simple swirling the solution in air in the presence of K2C0334 (Scheme 19). For X = O, air-oxidation mediated by dimethyl sulphoxide and potassium terf-butoxide resulted in dehydrogenation with formation of the 2-pyridone derivative. 

To the use of powders, however finely mechanically divided, I think there are some objections particularly I doubt whether they could enter the minute vesicles of the lungs, but if such substances can be chemically divided and obtained in the state of solution in air of some congenial species, they might have their full effect.128... 

Mr De Luc is here now, he is busy writing a dissertation on spontaneous evaporation, which he contends is not caused by a solution in air but by Latent heat, in the same manner as vapour is produced by boiling water. I am giving him all the assistance in this subject I can, and he makes frequent and honourable mention of me in the work which is of consequence as it is to be published at Paris.21... 

Ferrous chloride accelerates the oxidation of stannous chloride solution in air, the maximum effect being obtained with one molecule of FeCl2 to 100 molecules of SnCl2.4... 

The oxidation of arsenopyrite [FeAsS] releases both sulfur and arsenic. Buckley and Walker (1988) studied the oxidation of arsenopyrite in alkaline and in acidic aqueous solutions. In air, the mineral reacted rapidly, and the oxidation of arsenic to As(III) was more rapid than the oxidation of iron on the same surface. Only a small amount of sulfur oxidation occurred. Under acidic conditions, the mineral formed sulfur-rich surfaces. 

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