Dissolving reagent

Chromomycin A3 [7059-24-7] M 1183.3, m 185 dec, [a] -57 (c 1, EtOH). Dissolve reagent (lOg) in EtOAc and add to a column of Silica Gel (Merck 0.05-0.2microns, 4x70cm) in EtOAc containing % oxalic acid. Elute with EtOAc+1% oxalic acid and check fractions by TLC. Pool fraction wash with H2O thoroughly, dry and evaporate. Recryst from EtOAc. The hepta-acetate has m 214°, [a] -20° (c 1, EtOH). [Tetrahedron 23 421 7967 J Am Chem Soc 91 5896 1969.]... 

Assumption 5. Transfer processes as within the cell have been regarded as quasistationary. The typical time of the processes in the electrode (time of a charging or discharging being Ur-I04 s) is longer than the time of the transitional diffusion process in the elementary cell tc Rc2/D 10"1 s (radius of the cell is Rc 10"5 m, diffusion coefficient of dissolved reagents is D 10"9 m2/s). Therefore, the quasistationary concentration distribution is quickly stabilized in the cell. It is possible to neglect the time derivatives in the transport equations. 

Taking into account the spherical symmetry and the quasistationarity, we have the following transition equations for the dissolved reagent and product in a pore (r[Pg.467]

Note here that the term batch refers to the liquid phase - that is, to the dissolved reagents.)... 

A propulsion unit, usually a peristaltic pump, that produces a flow of one or several solutions (streams), either containing a dissolved reagent or merely acting as a carrier... 

Fig. 2.21 (a) Scheme of a basic FIA system. C carrier (with or without a dissolved reagent) PS propelling system IV injection valve R reactor D detector W waste, (b) Slow recording—the commonest in this technique—corresponding to injection of triplicate standards and quintuplicate samples, (c) Fast recording, with its characteristic parameters. 

Rueda, E.H. Ballesteros, M.C. Grassi, R.L. Blesa, M.A. (1992) Dithionite as a dissolving reagent for goethite in the presence of EDTA and citrate. Application to soil analysis. Clays Clay Min. 40 575-585... 

Solvents WW-dimethylformamide (DMF VWR), methanol or ethanol (VWR), V-methylpyrrolidone (NMP Fluka), diethyl ether (VWR), dichloromethane (methylene chloride, DCM VWR). Solvents for washing steps should be of at least ACS quality, whereas solvents for dissolving reagents must be amine and water free. Organic solvents (except for methanol and ethanol) should be stored in the dark. 

Figure 2.2). The reaction occurs between the two mutually dissolved reagents to afford a viscous paste that becomes red in colour upon standing for 1 h. The products could be easily purified using water to remove the acid and hot methanol for recrystallization. 

In the fume-cupboard, weigh 30.0 g per litre sodium dodecyl sulfate (sodium lauryl sulfate) into a 1 litre beaker. Dissolve it in about 500 cm3 water and add the other dissolved reagents. 

Use Milli-Q water for preparing buffers and dissolving reagents. 

The development of biosensors is parallelled by that of analyzers using enzymes as dissolved reagents or immobilized in flow-through reactors coupled with electrochemical or spectrophotometric indication. 

It is evident firom this brief introduction that ionic liquids may affect reactivity much more than molecular solvents. They are not only mixtures of two species interacting with each other (anion and cation), each able to give specific interactions with the dissolved reagents and/or activated complexes, but the anion-three-dimensional structures able to exercise unusual effects. 

For chemical reactions on an insoluble polymer, dissolved reagents and washing media of maximal solvation power are needed to swell the cross-linked support. In peptide synthesis most of the reagents and solvents used are volatile, corrosive, and toxic. Therefore, these properties of the fluids also have to be taken in consideration during storage, pumping, and metering in a peptide synthesizer. 

Prepare the biotinylating reagent immediately prior to use. Dissolve Reagent I in DMSO at a concentration of 2 mg/ml or Reagent II in water at a concentration of 2 mg/ml. 

Each element is labeled by the vector m = (i,j, k), and the element nodes are numbered by the index = 1 — 8 and characterized by the coordinates r (m) [3]. Within each element m, the concentrations of the dissolved reagent u(m), the oxidized metal-ion catalyst u(m), and the volume fraction of polymer < (m) are taken to be spatially uniform. The latter value is related to the volume of the element V(m) as 0(m) = A < o/T(m). Within each element, we introducealocal coordinate system (, , f) as shown in Figure 8.1a. We then calculate the coordinates within the element m in this local coordinate system through the values of the nodal coordinates r (m) and a set of shape functions, as detailed in Refs. [37, 38). We perform aU the necessarily volume and surface integrations within each linear hexahedral element in this local coordinate system [3]. 

Chemical doping is carried out by exposure of the clean film material to the doping gases. The doping rate and the amount of dopant cannot easily be controlled. Also, a suspension of the solid polymeric material in a solvent can be doped by dissolved reagents. A new method is solid-state doping under UHV conditions [181,182]. 

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