Vacuum flask

Ethyl vinyl ether was used to protect –OH on glycidol based on a literature reported protocal.59 In a typical procedure, 0.675 mol glycidol and 200 mL ethyl vinyl ether were loaded in a round-bottom flask, to which 1.25 g TsOH was then added. The reaction was allowed to proceed at room temperature (RT) for 3h. The resulting mixture was then purified by washing with 100 ml saturated aqueous solution of NaHCO3 for 3 times. The organic layer obtained was dried by MgSO4. After filtration of MgSO4,…

25.0 ml of 2-methylcyclohexanol in a 100-ml round bottom flask and to this 10 ml of 9 M sulfuric acid is added which acts a catalyst to this reaction. The content is swirled is completely for about 2 minutes periodically. Then 3 boiling chips is added to the mixture, now starts the fraction distillation. The mixture is heated with a heating mantle for distillation to occur. It is heated until 10-ml of the mixture remains in the reaction flask or less than 100°C. The organic liquid obtained is…

Stereochemistry conformation is how molecules are orientated in space. There are two basic types of isomers: constitutional or stereoisomers. Constitutional isomers gave the same molecular formula but different connectivity, while stereoisomers have the same connectivity but a different orientation in space. Stereoisomer has two subunits called enantiomers and diastereomers. Enantiomers are molecules that are mirror images, while diastereomers are not mirror images. Stereochemistry focus…

500 mL four-nick flask kept in water bath with stirring (at 25 ± 0.5° C and 250 rpm) containing the former ferric chloride solution using a roller pump at a rate of 20 mL/min. In order to reduce the oxidation of ZVI, anaerobic environment was provided through a continuous nitrogen gas purging during the synthesis. With regard of ensuring a complete reaction, the aging time of the mixture inside the four-nick flask was 20 min. The black iron precipitates were collected by vacuum filtration and…

dihydropyridines are also powerful antioxidants. In this lab, 430 mg of ammonium acetate, 960 microliters of ethyl acetoacetate, and 36% wt. aqueous formaldehyde were added to a 10 mL round bottom flask and allowed to heat to 80°C with constant stirring. After 10 minutes, a solid and wet product was formed. Vacuum filtration was then used to filter the product. Recrystallization methods were then completed using 95% ethanol in order to isolate the pure…

The purpose of this lab is to calculate the chemical formula of a hydrate compound made up of copper, chlorine, and water molecules by using the law of definite proportions. The water of hydration of the copper chloride hydrate sample will be determined as well as the mass of copper and chlorine through a chemical reaction. The results will be used to calculate the moles of copper and chlorine and then the empirical formula of the compound. Techniques used: In this experiment, different…

Theophylline taken in to 100ml volumetric flask to which add 40ml of mobile phase [Acetonitrile-Water (40:60,v/v)] and sonicated for about 10 min then the final volume was made upto100 ml with the mobile phase and shaken then filtered through 0.45µ membrane filter. The filtered solution was further diluted in the diluent to make the final concentration. Preparation of Level – I (0.25ppm Of SS & 12.5ppm of TP) 2.5ml of stock solution was taken in to 100ml of volumetric flask and dilute up to the…

Discussion and Conclusion: During the addition of granulated zinc, chromium (III) chloride to HCl solution we observed colour change form dark green to blue. This is due to the fact that reduction reaction is taking place, reducing Cr(III) to Cr(II). Flask containing blue Cr(II) solution was left for 30 minutes in the fume hood while the solution of sodium acetate and water was prepared and degassed. Slight appearance of green colour was observed. This was due to the oxidation of small amounts…

egg compared to Chicken egg. (http://www.poultryline.com/issues/oct/duck%20eggs%and their…pdf) Carbohydrates Using Avocado seeds, the measurement of carbohydrates by means of using the Fehling’s reaction in an Erlenmeyer flask and methylene blue was used indicator. The flask was then titrated…

ofp-[1-(p-Hydroxyphenyl)-1-(p-Methoxyphenyl)Ethyl]Phenol (HMEP) 0.2 mol of phenol was mixed with the solution containing 100 mL of acetic acid in 200 mL of concentrated hydrochloric acid in 500 mL five necked round bottom flask fitted with anoil bath, thermometer, mechanical stirrer, reflux condenser. The contents of the flask was stirred for a period of 15 min, the solution was heated to 65oC, 0.1 mol ofp-methoxyacetophenone was introduced into a dropwise to the solution for about 6 h. Then the…