anhydride. CO2H OH salicylic acid 2g 0.014 mole O O O CH3 H2SO4 ethyl acetate CO2H O O acetyl salicylic acid acetic acid CH3 O + H3C + H3C OH acetic anhydride 5 mL 0.05 mole The limiting reagent is salicylic acid. The theoretical yield of acetyl salicylic acid is 2.52 g. Physical Data:* mp MW salicylic acid 157-9˚ 138 acetyl salicylic acid 135-6˚ 180 acetic anhydride — 102 acetic acid — 60 sulfuric acid — 98 ethyl acetate — 88 *Data from the CRC‚ 70th ed. bp — — 138˚ 117-8˚
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* Benzaldehyde * Acetone * Sodium Nitroprusside Test – Test for presence of acetone * -Wine red solution * Iodoform Test – Test for Methyl Ketones * Acetone – positive * Ethyl methyl ketone – positive * Ethyl acetate * Special test for Benzaldehyde * Formation of crystals * Molisch Test – General test for Carbohydrates * Violet ring (2nd layer) * Glucose – positive * Starch - positive
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The reaction used for production of vinyl acetate using ethylene‚ acetic acid and oxygen over a palladium catalyst‚ in gas phase is shown below: 2 H3C–COOH + 2 C2H4 + O2 → 2 H3C–CO–O–CH=CH2 + 2 H2O Vinyl acetate synthesised is used for production of polyvinyl acetate. Acetic anhydride Acetic anhydride can be synthesized by condensation reaction of two molecules of acetic acid. The main process involves
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Classification Tests for Carboxylic Acid and Derivatives Mary Catherine Sarte‚ John Emmanuel Sy‚ Allurie Umel‚Franklin Yap‚ Mary Christine YouIntroduction Carboxylic acids derivatives are simply groupsof compounds that contain a carbonyl group butwith an electronegative atom attached to thecarbon. The difference in the structure leads to amajor change in reactivity. The reactions of thesegroups of compounds involve nucleophilicsubstitution. Although there are abundant kindsof carboxylic acid derivatives
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reaction. If the bromine reacted with the alkene the bromine would discolor from orange and turn clear. Experiment Part A) Solubility of Alkanes: 1 mL of nine solvents (water‚ methanol‚ n-butanol‚ ethylene‚ glycol‚ acetone‚ hexane‚ toluene‚ ethyl acetate‚ and dichloromethane.) was added to nine sample vials. Each vial then had 0.5 mL of the alkane decalin added to each one. The mixtures were stirred to determine if the materials dissolved. If the material was insoluble it was heated with an
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Abstract: In this lab‚ the chemical components of Excedrin and Tylenol‚ two common‚ over-the-counter analgesic drugs‚ were determined by utilizing the technique of thin-layer chromatography‚ or TLC. The active ingredients of Excedrin were caffeine‚ acetaminophen‚ and aspirin with Rf values of 0.11‚ 0.38‚ and 0.61‚ respectively. The lone active ingredient of Tylenol was acetaminophen with an Rf value of 0.39. The elution sequence obtained in the experiment is as follows: ibuprofen (least polar)
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about 10 minutes. Next‚ 4- bromophenylacetic acid was added to the flask and the mixture was refluxed for about 50 minutes at about 80°C. TLC was used to monitor the reaction progress every 15 minutes. A relatively non-polar solvent system of 25% ethyl acetate/ 75% hexanes was used as the mobile phase. Each plate contained a starting material (4-bromophenylacetic acid)‚ a reaction mixture spot‚ and a co-spot. The TLC at 15 minutes showed the starting material to have an Rf of about 0.12 and reaction
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Biological investigation of Arum palaestinum 6.1. Antioxidant activity The antioxidant activity of the ethyl acetate fraction of A. palaestinum characterized by its strong DPPH free radical scavenging activity (SC50 3.1 ±0.82 μg/mL) [4]. Both of the aqueous and ethanol extracts had remarkable antioxidant activities about 43.1‚ 12.7%‚ respectively [39]. Recently
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and stirrer were then set to 7.0 and turned on. The batch reactor was started to ensure the conductivity probe was functional and the reading was displayed on the PC. 500mL of ethyl acetate was then added to the reactor‚ which was maintained at approximately thirty degrees Celsius by a water bath. As soon as the ethyl acetate was added‚ the conductivity and temperature were measured at two minute intervals until the conductivity plateaued‚ indicating the point of maximum conversion for the reaction
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Laboratory #6 Qualitative Tests for Carbonyls: Aldehydes vs. Ketones Introduction Various chemical tests identifying ketones and aldehydes are used in this experiment in order to identify an unknown carbonyl compound. The tests used are: 2‚4-dinitrophenylhydrazone test‚ Tollen’s Test‚ Benedict’s Test‚ Chromic Acid Test‚ aka Bordwell-Wellman Test‚ Schiff’s Test‚ and Iodoform Test. These classification tests provide results based on color change or formation of precipitation‚ which is then used
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