Round bottomed flask with condenser

To a 1 L three-necked round-bottomed flask with condenser, under a N2 atmosphere, containing 40mLTHL and Mg turnings (13.42 g, 552mmol) 1-bromo-3,5-dimethylbenzene (13.62g, 73.6 mmol) was added with stirring at a rate such... 

When the period of reflux has been completed, discontinue heating, lift the apparatus out of the aluminum block, and allow the reaction mixture to cool. Do not remove the condenser until the flask is cool. Be careful not to shake the hot solution as you lift it from the heating block or a violent boiling and bubbling action will result this could allow material to be lost out of the top of the condenser. After the mixture has cooled for about 5 minutes, immerse the round-bottom flask (with condenser attached) in a beaker of cold tap water (no ice) and wait for this mixture to cool down to room temperature. 

A 500-mL round-bottom flask with condenser, mechanical stirrer, tube, and addition funnel attachments was used as the reaction vessel. Approximately 250 mL of benzene and 39.3 g (0.295 moles) of aluminum chloride were placed in the reaction flask. The reaction flask was cooled in an ice bath and then 30.0 g (0.148 moles) of phthaloyl chloride, which had been previously dissolved in 25 mL of benzene, was added slowly with stirring to the reaction flask. The red mixture was warmed until evolution of hydrogen chloride ceased. The reaction mixture was cooled to room temperature and then poured into 250 mL of crushed ice. The benzene layer was removed, washed with three-100 mL portions of six normal hydrochloric acid, and washed again with three-100 mL portions of distilled water. The washed benzene solution was dried over anhydrous magnesium sulfate and concentrated to 75 mL by rotary evaporation. When the benzene solution was cooled to room temperature crystals were produced. The crystals were dissolved in boiling 95% ethanol and the solution decolorized with charcoal. The... 

Preparative Method rhodium(III) chloride trihydrate (10 g, 0.042 mol) and pentamethylcyclopentadiene (6 g, 0.044 mol) were placed in a 500 mL round-bottomed flask with condenser and dissolved in reagent-grade methanol (300 mL). The solution was heated under reflux under a N2 atmosphere for 48 h. The resulting dark red precipitate was Altered and washed with diethyl ether and dried under reduced pressure. ... 

Fit a 250 ml. round-bottomed flask with a refllix water-condenser down which pieces of sodium may be dropped alternatively, use a flask having a short straight stoppered side-arm for this purpose. 

Fit a 500 ml. round-bottomed flask with a dropping-funnel, and with an efficient reflux water-condenser having a calcium chloride guard-tube at the top. 

Fit a 500 ml. round-bottomed flask with a dropping funnel and a double surface condenser alternatively, the flask may be provided with a two-way addition tube (Fig. II, 13, 9) and the dropping funnel and condenser inserted into the latter. Place 37 g. (46 ml.) of iso-butyl alcohol (b.p. 106-108°) and 40 g. (41 ml.) of pure pyridine in the flask and 119 g. (73 ml.) of redistilled thionyl chloride in the dropping funnel. Insert a cotton wool or calcium chloride guard tube into the mouth of the funnel. Introduce the thionyl chloride during 3-4 hours a white solid... 

Ethyl Bromide. Fit a 1-litre round-bottomed flask with a two holed cork carrying a separatory funnel and a wide (6-8 mm.) bent tube connected to a long efficient condenser set for downward distillation (Fig. 111,35,1) alternatively, Fig. Ill, 35, 1. a two-way addition tube (Fig. 11, 1, 8)... 

Fit a 750 ml. round-bottomed flask with a fractionating column attached to a condenser set for downward distillation. Place 500 g. of diacetone alcohol (the crude product is quite satisfactory), 01 g. of iodine and a few fragments of porous porcelain in the flask. Distil slowly. with a small free flame (best in an air bath) and collect the following fractions (a) 56-80° (acetone and a little mesityl oxide) (6) 80-126° (two layers, water and mesityl oxide) and (c) 126-131° (mesityl oxide). Whilst fraction (c) is distilling, separate the water from fraction (6), dry with anhydrous potassium carbonate or anhydrous magnesium sulphate, and fractionate from a small flask collect the mesityl oxide at 126-131°. The yield is about 400 g. 

Apparatus 1-1 three-necked, round-bottomed flask with a dropping funnel combined with a gas inlet, a mechanical stirrer and a reflux condenser in the case of CHjMgBr, however, the apparatus in Fig. 1 is used. 

Apparatus 500-ml flask (see Fig. 1) for the preparation of the sulfinate 250-ml two-necked, round-bottomed flask with a reflux condenser and a thermometer for the 2,3-sigmatropic rearrangement. 

Apparatue 500-ml three-necked round-bottomed flask, with a dropping funnel, a mechanical stirrer and a thermometer, combined with a vent, for the addition to the isopropenyl ether for the further reaction the dropping funnel was replaced with a thermometer and the combination of thermometer and vent with a reflux condenser. 

Apparatus 500-ml three-necked, round-bottomed flask with a thermometer, dipping well into the liquid, a 40-cm Widmer column and a dropping funnel the column was connected to a condenser and receiver. 

Apparatus 1-1 two-necked, round-bottomed flask with a mechanical stirrer and a reflux condenser. 

The carbonyl compound to be reduced (0.1 mole) is placed in a 250-ml round-bottom flask with 13.5 g of potassium hydroxide, 10 ml of 85% hydrazine hydrate, and 1(X) ml of diethylene glycol. A reflux condenser is attached and the mixture is heated to reflux for I hour (mantle). After refluxing 1 hour, the condenser is removed and a thermometer is immersed in the reaction mixture while slow boiling is continued to remove water. When the pot temperature has reached 200°, the condenser is replaced and refluxing is continued for an additional 3 hours. The mixture is then cooled, acidified with concentrated hydrochloric acid, and extracted with benzene. The benzene solution is dried, and the benzene is evaporated to afford the crude product, which is purified by recrystallization or distillation. 

The ketoester is mixed in a suitable round-bottom flask with excess 6 N sulfuric acid. The flask is fitted with a condenser and a mantle, and the mixture is refluxed gently for 3-4 days. The cooled reaction mixture is extracted with ether, the ether is washed with bicarbonate solution and water, then dried, and the solvent is evaporated. On distillation, the residue affords 2-methylcyclooctanone, bp 97-98718 mm, 86712 mm, 1 4656,... 

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