Nitrogen, atmosphere and

The reactor charge is heated to 140°C under a nitrogen atmosphere and the monomer charge and initiator charge are added uniformly over three hours while maintaining 140 2°C. After the additions are complete, this temperature is maintained for two more hours, then the product is cooled and packaged. A clear, viscous solution of about 58% polymer is obtained (63). 

Emmerich Method. This method is for determination of trace amounts of reducing sugars in pure sucrose and white and refined sugars with reducing sugar content up to 0.15%. The test is carried out in a nitrogen atmosphere and is based on the reduction of 3,6-dinitrophthahc acid. 

Eor many polymeri2ations, MEHQ need not be removed instead, polymeri2ation initiators are added. Vinyhdene chloride from which the inhibitor has been removed should be refrigerated in the dark at —10° C, under a nitrogen atmosphere, and in a nickel-lined or baked phenolic-lined storage tank. If not used within one day, it should be reinhibited. 

All precautions with regard to the purification of tetrahydrofuran, the quality of the iron powder, the rapid stirring, the maintenance of a nitrogen atmosphere, and the handling of cyclopentadiene, described in the preceding preparation, are followed. 

Methyl-dibenzo[b,fl azepine (4.1 g), N-diethylaminoborane (1.7 g) and freshly distilled toluene (150 cc) are introduced into a 500 cc three-neck flask equipped with a dropping funnel and a condenser, and protected against moisture by a calcium chloride guard tube. The solution Is heated under reflux (110°C) for 22 hours under a nitrogen atmosphere and then cooled. A 2N aqueous sodium hydroxide solution (33 cc) is then run in followed by an... 

Caution Diethylzinc, which is used in Part B of this procedure, is highly pyrophoric. Accordingly this reagent must be kept under a nitrogen atmosphere, and exposure to air must be avoided during transfers. 

N,N-Dimethylformamide was purified by distillation from calcium hydride under a nitrogen atmosphere and stored over Linde type 4A molecular sieves. 

Model predictions are caipared with experimental data In the case of the ternary system acrylonitrlle-styrene-methyl methacrylate. Ihe experimental runs have been performed with the same recipe, but monomer feed composition. A glass, thermostat ted, well mixed reactor, equipped with an anchor stirrer and four baffles, has been used. The reactor operates under nitrogen atmosphere and a standard degassing procedure is performed Just before each reaction. The same operating conditions have been maintained in all runs tenperature = 50°C, pressure = 1 atm, stirring speed = 500 rpm, initiator (KgSgOg) 0. 395 gr, enulsifier (SLS) r 2.0 gr, deionized water = 600 gr, total amount of monomers = 100 gr. 

Equilibrium stress-strain dependences were determined in extension using a stress relaxation arrangement described earlier (21). Dry non-extracted samples were measured at 150 C in nitrogen atmosphere and extracted samples swollen in dimethylformamide were measured at 25 C. The equilibrium value of stress 6 e was reached within 2-4 min except of a few dry samples with the lowest tig, for which the equilibrium stress was determined using an extrapolation procedure described earlier (21). 

The reactions were carried out in sealed Pyrex tubes employing a prototype single-mode microwave cavity. The reagents were added to the resin-bound aryl halide under a nitrogen atmosphere and irradiated for the time periods indicated (Scheme 7.14). Rather short reaction times provided almost quantitative conversions, with minimal degradation of the solid support. 

Thermal gravimetric analysis (T.G.A.). measurement of the weight loss, as a function of temperature, of some of the SiC -g-PS samples was carried out using a Stanton Redcroft TG 750 instrument at a heating rate of 5° min- under a nitrogen atmosphere, and at a gas flow rate of 20 cm min-. ... 

The first type of equipment for SILAR was that described by Nicolau,1 who arranged alternating reaction and rinsing vessels in a circle (Fig. 8.2). During the deposition, the vessels and the substrate are placed under a hood in a nitrogen atmosphere and the substrate is lifted and rotated from one vessel to another by two electric motors. The rinsing water is circulated from a reservoir to the rinsing vessels with the aid of a peristaltic pump.1,9... 

Isobutyryl chloride (25.9 g, 0.24 mol) was added dropwise to triethyl phosphite (43.9 g, 0.26 mol) with stirring under a nitrogen atmosphere, and the temperature was maintained at 30 to 40°C. After the addition was complete, the reaction mixture was allowed to stand overnight at room temperature. The reaction mixture was vacuum distilled to give the pure diethyl isobutyrylphosphonate (43.9 g, 88%) of bp 75 to 83°C/3-4 torr, which exhibited IR spectral characteristics in accord with the assigned structure. 

D. Bromotris[3-(2-methoxyethoxy)propyl]stannang (4). A dry, 50-mL, round-bottomed flask is placed under a nitrogen atmosphere and charged with 8.25 g (14.0... 

Unless otherwise indicated, all reactions were run under solid-liquid conditions in a nitrogen atmosphere and water was azeotropically removed during the course of the reaction. Initial product isolation was accomplished by rapid filtration of the reaction mixture through a silica gel column followed by concentration of the organic phase. Data for BTEAC liquid-liquid conditions and for TBAHS from ref 39. Benzyltrimethylammonium chloride,... 

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