The reason why we chose to create trans-stilbene is become of its many practical applications. Stilbene exists as two possible isomers. The first is trans-1‚2-diphenylethylene‚ called trans-stilbene. The second is cis-1‚2-diphenylethylene‚ called cis-stilbene which is sterically hindered and less stable because the steric interactions force the aromatic rings out-of-plane and prevent conjugation. Z-stilbene has a melting point of 5°C to 6°C‚ while (E)-stilbene melts around 125°C‚ illustrating the two
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al Chain Reactions: Bromination of Arenes Introduction The purpose of the bromination of arenes was to determine the different reactivities of different hydrocarbons with different hydrogen atoms when reacted with bromine under free-radical substitution. The time it took for the bromine color to disappear was used to determine the order of reactivity of the different hydrocarbons. Data and Results The data of the 10 hydrocarbon tubes and the 2 control tubes with bromine and dichloromethane in
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Abstract The bromination of trans-cinnamic acid was completed to determine dibromide’s stereochemical structure and its mechanism. After the addition of bromine to trans-cinnamic acid‚ the product was identified by its melting point and infrared spectrum resulting in erythro-2‚3-Dibromo-3-phenylpropanoic acid after comparing similar properties. Introduction In this lab‚ the bromination of trans-cinnamic acid was completed to determine dibromide’s stereochemical structure‚ and from there determine
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Lab 3: Bromination of Acetanilide CHEM 2110 Hassan Alsaleh 0525970 Due date :11/02/2015 Q1: To find the limiting reagent we need to find the number of moles of acetanilide‚ and the number of moles of Bromine. Mass of Acetanilide used = 0.67g Molar mass of Acetanilide = 135.16g/mol[1] Number of moles of Acetanilide = (0.67g) / (135.16g/mol) = 0‚005 mols Volume of Bromine = 0.25ml Density of Bromine = 3.103 g/ml[2] Mass of Bromine = (0.25ml) X (3.103g/ml) = 0.78g Molar mass of Bromine
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BroIn this experiment of the relative rates of free-radical chain bromination‚ we were expected to be able to determine the relative reactivates of the many types of hydrogen atoms involved toward bromine atoms. Bromination is defined to be a regioselective reaction meaning bromine has preference of making or breaking a bond over all other directions that it may have had available. In this case‚ Markovnikov’s rule is revealed to be the case in this situation that states that adding a protic acid
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Hydrocinnamic acid underwent bromination using N-bromosuccinimide and AIBN. As one lab partner set up the reflux apparatus‚ the other measured the chemicals used in the lab experiment. 2.10 g of hydrocinnamic acid was used. It was observed as white and had a slight cinnamon smell. The amount of NBS was 2.49g and was measured in the fume hood. AIBN was measured at .030 g. 10 mL of acetic acid was also obtained. The reflux apparatus consisted of a 25 mL flask with a stir bar in a water bath. The chemicals
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Organic Chemistry I LAB EXAM: FINAL BROMINATION OF BENZENE SYNTHESIS AND PURIFICATION OF BROMOBENZENE: PROCEDURE DATA TABLE Chemical Boiling point C Melting Point C Density g/mL Solubility Benzene 80.1 5.5 0.88 Slightly in H2O Toluene 110.6 -93 0.87 Slightly in H2O Bromobenzene 155-156 -30.8 1.50 Insoluble Dibromobenzene 220.40 87.31 0.96 Insoluble MATERIALS: Graduated cylinder Weight scale Buchner funnel Filter flask Rubber stopper Hot plate Thermometer Conical funnel Various
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http://www.imbaenergyclub.gr/2012/10/10/green-marketing-from-theory-to-practise/ By Karolos – Konstantinos Papadas PhD Candidate in Marketing‚ AUEB It has been noticed that during periods of recession or social change‚ megatrends such as “quality movement” (1970’s)‚ “globalization” (1980’s) and the internet (1990’s) emerge. In recent years‚ governments‚ NGO’s and agencies have been informing the citizens about the harmful consequences of human activity on the environment. Environmentalists are
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this essay‚ I will briefly review the history‚ definition of Green IT‚ approaches to implement green IT with examples‚ benefits and costs of Green IT. History and Definition of Green IT History of Green IT started with energy star program in 1992 which was designed to encourage and recognize the energy efficiency in the monitors and printing product. Green IT was emerged shortly after the energy star program and the goals of green IT are to reduce the use of hazardous materials‚ maximize energy
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Green Technology: Future of power generation NEED FOR GREEN TECHNOLOGY Recently concluded Copenhagen conference on climate change and green house emission expressed concern over the amount of CO2 being released. This would in turn heat up the atmosphere and cause global warming that will result in the melting of glaciers and hence the sea level will rise that is a threat to several coastal cities of the world. So one can imagine how the amount of CO2 emissions can cause problems of displacing
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