Ethyl acetate

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    Bromination of trans-cinnamic acid Purpose and Introduction The halogenation of of trans-cinnamic acid using pyridinium tribromide was connected in the organic solvent glacial acetic acid in order to verify and test which addition mechanism the reaction would follow. In the anti-addition mechanism, bromines attach themselves on opposite sides of the alkene functional group in a compound. In a syn-addition, the attach to the same side of the alkene. The reaction synthesis was completed by using a reflux system to produce to crude product, and a vacuum filter to yield a solid, crude product. Recrystallization of the solid product was performed, allowing the impurities of the solid to be removed while slowly crystallizing and the product. The melting point of the final recrystallized product was taken to compare and verify to that of the which stereoisomer of 2,3,-dibromo- 3-phenylpropanoic acid is produced, and therefore, determine which addition mechanism took place for the halogenation reaction. Theory The character of the halogenation anti mechanism begins with the electrophilic addition of bromine to trans-cinnamic acid. The bromine is an induced dipole electrophile, which is attacked by the alkene and forms the bridged-ion intermediate. The large size of the bromide atom results in the nucleophilic bromide anion performing a “backside attack” similar to that of SN2. The resulting product is a vicinal dibromide with a trans or anti relationship. As there are two…

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    瀀瀀ract The purpose of Isolation of Bixin from Annatto Seeds using Column Chromatography was to separate and purify macroscopic amounts of pure bixin compound from annatto seed ex-tract.1 A mixture of bixin, methylbixin, and norbixin were extracted from annatto seeds. Bixin was then isolated from the mixture through the use of the column chromatography technique. The isolated bixin was characterized through Thin Layer Chromatography (TLC) analysis, which displayed an Rf value of 0.317, which…

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    Ethyl Cinnamate Lab Report

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    Abstract: The purpose of this experiment was to extract ethyl cinnamate, cinnamic acid, and glucose, which are ingredients in the candy, Red Hots. The experiment began with 0.604 grams of a mixture of ethyl cinnamate, cinnamic acid, and glucose. The purity of glucose and ethyl cinnamate was measured through IR Spectroscopy. Melting point was used to determine the purity for cinnamic acid. Using the final amount for each ingredient, we determined the percent yields, which were 64.7% for glucose,…

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    The mixture is also sonicated to further assist the increase in rate of reaction. The solid portion of the slurry is insoluble in ethyl acetate which is the excipients of the tablets therefore didn’t dissolve due to its polarity. The solid portion was filtered using filter paper into a seperating…

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    bilimbi fruits (ABE) was fractionated by 100% petroleum ether (F1), followed by ethyl acetate: petroleum ether (F2, 20 : 80), ethyl acetate: petroleum ether (F3, 40 : 60), ethyl acetate: petroleum ether (F4, 60 : 40), ethyl acetate: petroleum ether (F5, 80 : 20), 100% ethyl acetate (F6), methanol: ethyl acetate (F7, 20 : 80) and methanol: ethyl acetate (F8, 40 : 60). Sl No Fractions Yield (g %) F1 100% petroleum ether 1.2% F2 ethyl acetate: petroleum ether (20 : 80)…

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    Data and observation collected from column and TLC (silica stationary plate) on a mixture of ortho and para nitroaniline .The eluent used was a mixture of hexane and ethyl acetate, (13 ml) and (7 ml), respectively; the mobile phase used for the TLC was acetone. Fraction collected from elution of the dry column chromatography Mobile Phase used in Column Color and Number of Spots Observed Rf Value Test Tube 4-12 Mixture: hexane (13 ml) and ethyl acetate (7 ml) 9 clear-mustard yellow spots 0.27…

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    equimolar solution of ethyl acetate and propyl acetate was seperated. After distilling 20 mL of the mixture the samples were collected in fractions, which were then analyzed using gas chromatography. The mole ratios of the distillations were converted to a percentage to analyze percent composition. Simple distillation yielded the following results: S1- 69.88% EA/ 30.12% PA, S2- 66.73% EA/ 33.27% PA, and S3- 46.42% EA, 53.58% PA. Fractional distillation yielded: F1- 82.66% EA/ 17.34% PA, F2-…

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    Following TLC, the sample was evaporated with the Rotavap® and then extracted using 4:1 1-butanol and ethyl acetate as the organic layer and water. The sample failed to dissolve, so the organic layer was decanted off, and dichloromethane was used instead. The bottom-layer (dichloromethane and sample) was run through the Rotavap® and the sample residue that was left was reacted with 1-pyrenehexanoic acid. The second step of forming the amide also required TLC, and was done using the same…

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    To identify the unknown chemical mixture (#757), a TLC analysis was conducted using three standards (aspirin, acetaminophen, and caffeine). A TLC plate was prepared by drawing an origin line and solvent front line with a pencil. Three spot were labeled A, B, and C. A sample of each standard was spotted on the analytical TLC plate approximately 1cm from the bottom of the plate. It was then enclosed in a jar filled with 2ml of 95% ethyl acetate- 5% acetic acid. (Another laboratory group conducted…

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    Wound Study

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    Wound is a case of injury that is often experienced by humans due to trauma with the occurrence of tissue damage. One type of injury is an injury caused by a sharp object such as a knife or a scalpel. Injuries can occur in diabetics. The Chinese castor plant (Jatropha multifida L.) has long been used to treat wounds. The purpose of this study was to determine the effect of gel preparation and transdermal patch of ethyl acetate extract of J. multifida L. sticks to the length of wound closure, the…

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