Friedel-Crafts Alkylation Reaction Friedel-Crafts Alkylation Reaction Preparation of 1‚ 4-Di-t-butyl-2‚ 5-dimethoxybenzene Microscale Experiment Leah Monroe April 8‚ 2003 Organic Chemistry Lab II Experiment performed on March 20 and 25‚ 2003 Lab Partners (NMR only): Shannon Land and Jamie Yeadon Abstract: In this experiment‚ 1‚4-dimethoxybenzene reacted with t-butyl alcohol to form 1‚ 4-Di-t-butyl-2‚ 5 dimethoxybenzene via a Friedel-Crafts Alkylation mechanism. A small amount of 1‚4-dimethoxybenzene
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ORIGINAL ARTICLE The use of the stable free radical diphenylpicrylhydrazyl (DPPH) for estimating antioxidant activity Philip Molyneux Abstract Molyneux‚ P. The use of the stable free radical diphenylpicrylhydrazyl (DPPH) for estimating antioxidant activity Songklanakarin J. Sci. Technol.‚ 2004‚ 26(2) : 211-219 The use of the stable free radical diphenylpicrylhydrazyl (DPPH) to estimate the activity of antioxidants is reviewed. Current applications of the method are examined‚ particularly
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various metals present in the sample of scrap aluminum and when reacting with the aluminum produces hydrogen gas and aluminate ions 2 Al(s) + 2 KOH(aq) + 6 H2O(l) 2 KAI(OH)4(aq) + 3 H2(g) The limiting reagent in this reaction is aluminum since we are producing “alum” crystals. The excess reagent is KOH. This excess is necessary to help accelerate the reaction‚ therefore guaranteeing a maximum yield of crystals Then‚ after sulfuric acid has been added‚ a number of reactions will occur:
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RECRYSTALLIZATION Group Medical Technology Organic Chemistry Laboratory ABSTRACT Recrystallization is one of the simplest and most widely used technique for purifying organic solids through the differences in solubility at different temperatures. It is also the process in which the solid to be crystallized is dissolved to either a hot solvent or a hot solvent mixture and is cooled in a solution.In this experiment‚ acetanilide‚ the crude product of acetylation of aniline and acetic anhydride
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one mark‚ some questions will have a total value of two marks. Note that there are MORE terms provided than you need‚ so read over the list carefully and choose the terms you want to use. The same term may be used more than once in this section. Stoichiometry (4 marks) 1. The calculated amount of product formed during a reaction is called the ____________________ yield. Theoretical 2. For a given chemical reaction‚ the actual yield is always ____________________ than the theoretical yield. Less / smaller
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(See Figure 1). Exactly 6.0mL of cyclohexanol is weighed in a quick-fit one-necked pear shaped flask. 1.50mL of 85% H3PO4 is measured using the 2mL pipet and added to the weighed cyclohexanol. Another 0.25mL of concentrated H2SO4 is also added. The reagents are mixed using stirring rod. Glass beads were added after it was shake very well. The heat regulator was switched to 5 or 6 and allowed to distill at 130-140°C until 0.50mL of the mixture was left in the pear-shaped flask. The hydrocarbon layer
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be valid‚ it should be unique‚ complete spontaneous and rapid. In titration: * Reaction is unique. The condition is indispensable to establish a relation between the amounts of matter of the reactants involved. * Reaction is complete. The reagents‚ which are introduced in stoichiometric proportions‚ should be completely consumed at equivalence. This is expressed by a difference in potentials of the two couples involved‚ ∆E0‚ greater than 0.3V. * Reaction is spontaneous and rapid. Reactants
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purify our products‚ we will have to add water to our crystals so that the acetylsalicylic acid can be dissociated from impurities. Using a technique called vacuum filtration‚ crystals will be held on a filtration paper while the liquid portion of reagents will drained into an Erlenmeyer flask. To purify our crystals even more‚ we will have to perform a procedure called re-crystallization‚ using ethyl acetate as our solvent instead of water in order to prevent decomposition of our products‚ and
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EXPERIMENT A PREPARATION OF ASPIRIN Abstract This report gives a detailed account of the experimental preparation of aspirin in a laboratory environment as well as some basic industrial background on the product. It also contains information about safety precautions put in place to ensure the safety of the team who carried out the experiment. All results obtained have been included as well as a detailed analysis of what they represent alongside any improvements to the method used. Introduction
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contains four sections‚ SECTION A to SECTION D. Instructions: Answer all questions in SECTION A - SECTION D. Make sure that the section heading is included and your answers are correctly numbered. The assignment must have a completed cover sheet. It must be placed in the drop-box on or before the deadline. st SECTION A ELECTRONIC STRUCTURE & IONIZATION ENERGY 1. 2. Write the electronic structure in s‚p‚d notation of the following: O‚ Na‚ Na+‚ Al‚ Cl- and Co
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