"Electrophilic aromatic substitution" Essays and Research Papers

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    Aromatherapy Oil Usage

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    these techniques as they burnt scented herbs and spices as part of their prayer rituals. The emergence of aromatic medicine is also closely linked to the belief in Egyptian gods and the underlying mystic healing powers they possessed and this association remains to this day as the use of aromatherapy oils is considered a spiritual based treatment. With a long and established history aromatic medicine

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    Electrophilic addition causes N2 to be lost‚ which is a thermodynamically favourable process‚ resulting in the formation of a stable carbene. The carbene is the intermediate and in this reaction‚ it is a highly reactive‚ neutral molecule. The carbene acts as

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    The Grignard Synthesis of Triphenylmethanol Organic Chemistry Lab II March 19‚ 2012 Abstract The purpose of this experiment was to synthesize the Grignard reagent‚ phenyl magnesium bromide‚ and then use the manufactured Grignard reagent to synthesize the alcohol‚ triphenylmethanol‚ by reacting with benzophenone and protonation by H3O+. The triphenylmethanol was purified by recrystallization. The melting point‚ Infrared Spectroscopy‚ 13C NMR‚ and 1H NMR were used to characterize and confirm

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    oxidation of benzoin. In order to produce the desired o-diketone‚ the alcohol on benzoin must be oxidized. Nitric acid was the oxidizing agent used in this experiment. As a result‚ the alcohol group on benzoin acted as the nucleophile and attacked the electrophilic nitrogen of nitric acid. As this step forms oxonium‚ excess water in the system deprotonated the oxonium to restore the neutral charge on oxygen. However‚ the organic nitrate was unstable due to its positively charged nitrogen. To stabilize the

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    recrystallized from ethanol‚ m.p. 155oC‚ 80% yield. Analysis calculated for C18H11Br2ClN4O2; Calcd.: %C‚ 42.34; H‚ 2.17; N‚ 10.97‚ Found: % C‚ 42.30; H‚ 2.14; N‚ 10.90. IR: υmax./cm-1 3000 (C-H aromatic)‚ 1610 (C=N) and at 1600 (C=C). 1H-NMR (DMSO-d6‚ ppm): δ 2.6 (s‚ 3H‚ CH3)‚ 5.4 (s‚ 2H‚ OCH2) and 7.5-8.2 (m‚ 6H‚ aromatic-H). 13C NMR (DMSO-d6): 185‚ 164‚ 162‚ 150‚ 141‚ 135‚ 133‚ 129‚ 128‚ 124‚ 123‚ 121‚ 117‚ 72‚ 21. MS: m/z = 510 N’-(2-(6‚8-dibromo-2-(4-chlorophenyl)quinazolin-4-yloxy)acetyl)isonicotinohydrazide

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    ksnc

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    Exam                                                                                                     Name___________________________________ MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. 1) 1) Disregarding stereoisomers‚ how many different enols can the  β-diketone CH3 COCH 2 COCH 2 CH3 form? A) 3 B) 1 C) 4 D) 0 E) 2 2) Methylamine reacts with acetophenone to yield the: A) imine. B) enamine. C) acetal. D) amide

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    Photochemistry

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    NPTEL – Chemistry – Reagents and Organic reactions Module II Lecture 14 Reduction Reactions 2.1.1 Lithium Aluminum Hydride (LAH) 2.1.1.1 Introduction Lithium aluminum hydride (LAH) is a strong reducing agent with chemical formula LiAlH4. It can reduce a variety of functional groups such as aldehydes‚ esters‚ acids‚ ketones‚ nitriles‚ epoxides and azides. It vigorously reacts with water and all the reactions are performed in polar aprotic solvents. 2.1.1.2 Preparation It was first

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    Synthesis of Aspirin

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    Lab 1: Synthesis of Aspirin Introduction: The purpose of this lab was to demonstrate the ability to easily alter the molecular structure of a compound to greatly increase its utility. In this case‚ an acetyl group was added to salicylic acid‚ a naturally occurring compound with significant pharmaceutical value. Without the addition of the acetyl group‚ salicylic acid is an irritant to the gastro-intestinal (GI) tract. Once the acetyl group is added via a simple reaction‚ acetylsalicylic

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    aromatherapy

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    in 1937. Thus the term aromatherapy was not coined until the 20th Century. The roots of Aromatherapy can be traced back over 6000 years before the birth of Christ when the use of aromatics was recorded for the first time in human history. The history of aromatherapy is linked strongly to the development of aromatic medicine. The ancient Greeks‚ Romans and Egyptians all used aromatherapy oils. In the Dordogne of France there are cave paintings found to be 18‚000 years old that depict the use of

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    Grignard Reaction

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    Name Lab Section GTA Station 1. Grignard Reaction Post-lab report Fill out the appropriate sections below. Show all work. Your calculated answers need to match the answers in the table. Also‚ attach the benzophenone and product spectra. Indicate appropriate stretches including differences in both spectra. Results | | Amounts and units | |Initial

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