its percent yield. Introduction: Aniline is a primary aromatic amine and weak base which forms salts with mineral acids. In acidic solution‚ nitrous acid converts aniline into a diazonium salt that is an intermediate in the preparation of a great number of dyes and other organic compounds of commercial interest. When aniline is heated with organic acids‚ it gives amides‚ called anilides‚ such as acetanilide from aniline and acetic anhydride. Acetic anhydride
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Bromination of Trans-Cinnamic Acid Christopher B. Martin CHEM 3411 1 Mechanism of Bromine Addition to Alkenes Understanding the chemical mechanism (order of bonds broken and made as well as intermediates formed) has a great value in chemical synthesis. The chemical mechanism of a reaction will influence the rate of the reaction‚ the stereochemistry of the product(s)‚ and the extent of possible undesired side reactions. Organic reaction mechanisms investigate the path towards a desired product
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Alkane‚ Alkene‚ Alkyne & Aromatic Learning Objectives 1. 2. 3. Determine the IUPAC name‚ common name and structure of an alkanes‚ alkenes and cycloalkanes. Identify the physical properties of alkanes. Describe briefly natural sources and importance of alkanes Describe reactions of alkanes Propose a mechanism on free radicals substitution 4. 5. 6. Describe the preparation and reactions of alkenes. 7. Propose mechanism on preparation; dehydration of alcohol 8. Define carbocation
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gum arabic powder and icing sugar. For a specifically black polish‚ 280 g (10 oz) of charcoal powder from the chemist may be added at this stage. In recent history the black colour comes from an aniline dye. The next recipe indicates that nigrosene (generically‚ a black dye made from oxidised aniline) was domestically procurable in the 1940s. Note that the above recipe uses potassium carbonate (potash) whereas the following recipe uses potassium bicarbonate‚ which is not potash. Imperial Measures
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impurities with different solubility to separate from the solution in each step. The objective of the experiment was to synthesize acetanilide by the acetylation of aniline and to purify crude acetanilide product by recrystallization. The group determined water as the recrystallizing solvent. The group performed acetylation of aniline and acetic anhydride for the formation of crude acetanilide. The recrystallizing solvent dissolved the crude acetanilide and was heated in a water bath‚ after heating
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[pic] Purpose: a) To synthesis acetanilide by reaction of aniline and acetic anhydride. b) To purify acetanilide by crystallization method from water c) Purity check by melting range Equipment / Materials and Hazars: hot plate beakers(150‚250mL) ice stirring rod spatula Büchner funnel aniline weighing paper digital scales
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evidence will show that the red solid collected after recrystallization from the nucleophilic aromatic substitution of 2‚ 4-dinitrobromobenzene and aniline has the characteristics of 2‚ 4-dinitrodiphenylamine. Evidence: The procedure was carried out as described by Ault1 and the lab manual2. 2‚4-dinitrobromobenzene (0.92g‚ 3.75mmol‚ pale yellow solid) and aniline (0.7mL‚ 0.7g‚ 7.5 mmol) were boiled in ethanol (10mL) under reflux until all solid dissolved. After the mixture cooled to room temperature‚ short
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was then recrystallized from methanol‚ yielding 0.128g of pale yellow crystals with a melting point of 131-135 oC. This represents 0.33% of the original mass of the two yolks. The cholesterol was then dissolved in ether and further purified by bromination with a bromine/acetic acid reagent and debromination with zinc powder‚ a series of aqueous washes‚ and a final recrystallization from methanol. Here‚ a yield of 28% was recovered from an initial mass of 100 mg of recrystallized material. The melting
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1. Which of the following are the products of a homolytic cleavage of a C-C bond of ethane? A) 2 B) CH3 CH3 C) H D) 2 + + CH3 CH2H3 CH3 Ans: A Chapter 11 Topic: Radicals Section: 11.1 Difficulty Level: Easy 2. Which of the following is the most stable radical? A) B) C) D) E) Ans: B Chapter 11 Topic: Radicals Section: 11.1 Difficulty Level: Easy 3. In the molecule shown below‚ determine which of the labeled bonds is
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molar mass for question #9 was determined by experiment to be 60.0 g/mol. What is the molecular formula? 11. Aniline‚ a starting material for urethane plastic foams‚ consists of C‚ H‚ and N. Combustion of such compounds yields CO2‚ H2O‚ and N2 as products. If the combustion of 9.71 g of aniline yields 6.63 g H2O and 1.46 g N2‚ what is its empirical formula? 12. The molar mass of aniline is 93 g/mol. What is its molecular formula? 13. Calculate the mass percent of carbon‚ nitrogen and oxygen
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