threo-dibromide (opposite side of Fischer Projection) H Ph Br H CO2H Br H Br Ph Br H Christopher B. Martin CHEM 3411 4 2 3. Carbocation Intermediate Br H Br CO2H H Ph Br CO2H H Br (top face) Br H Ph Br CO2H H Ph H Electrophilic Addition of one Bromine Carbocation Intermediate Cis Addition of the Bromine Atoms Br CO2H H H Ph H Ph CO2H (bottom face) H Br Br Br CO2H CO2H Br H Ph CO2H H Br Ph Br H H H H Br Br Br Trans Addition of the Bromine Atoms H H
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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 compounds are quite different. These two isomers can interconvert‚ however‚ under the influence
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dimethoxybenzene by reacting 1‚ 4 dimethoxybenzene with tertiary-butyl alcohol in the presence of sulfuric acid as a Lewis acid catalyst. The reaction will occur via the Friedel-Crafts alkylation mechanism‚ and involves the attack of the aryl group at the electrophilic trimethylcarbocation. The resulting product will be recrystallized using methanol and characterized using IR spectroscopy and melting point analysis. Materials Used: 1 beaker‚ 400-mL sand bath ice for ice bath Erlenmeyer flask‚ 25-mL several
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NORTHERN CARIBBEAN UNIVERSITY DEPARTMENT OF BIOLOGY‚ CHEMISTRY and ENVIRONMENTAL SCIENCE LABORATORY MANUAL Instructor: Dr. M. Wilson CHEM401: BIOCHEMISTRY for NURSES Prepared by: Oreane Collins CHEMISTRY LABORATORY REGULATIONS AND SAFETY PRECAUTIONS Reference: http://www.sciencebyjones.com/safety_rules.htm Thanks to the Flinn Scientific Safety Rules for much of the below. General Guidelines 1. Conduct yourself in a responsible manner at all times
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The purpose of this experiment was to synthesize triphenylmethanol from a Grignard reagent. The Grignard reaction technique was used in this synthesis but due to the fact that it is such a strong nucleophile and base‚ it was important to prevent water from interfering with the Grignard reaction. Purity of the product was determined by measuring the melting point. Reagent Table: Structure Name Molecular formula Molar mass Density Melting point Boiling Point Diethyl ether C4H10O
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Discuss different strategies for producing wine with low or no SO2. Is there global demand from consumers for such wines? SO2‚ sulfur dioxide has been considered as one of the essential additives for making sound wine‚ which acts as antioxidant and antiseptic. History of sulfur in wine dates back to Roman times when they discovered that wine was kept fresh by burning sulfur candles inside empty wine vessels. However‚ the number of wines produced with low or no SO2 is increasing in these 10 years
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Abstract Tamoxifen‚ most commonly sold under the brand name Nolvadex‚ is the most widely used drug in the treatment of breast cancer during both early and late stages. It belongs to a class of drugs known as SERMs (Selective Estrogen Receptor Modulators). SERMs work by blocking the estrogen receptors in breast cells to prevent any binding with estrogen. It is consumed orally as a tablet or as a liquid (Anon.‚ 2017). The following paper discusses the discovery of Tamoxifen‚ its laboratory synthesis
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cyclobutadiene has 4 electron (2pairs) so it’s not aromatic • cyclooctatetraene has 16 e (8 pairs) it also isn’t planer (it has a tub shape) so it’s not aromatic • sp3 hybridized atoms doesn’t have P orbitals not aromatic aromatic not aromatic Not aromatic Not aromatic Cycloheptatriene cyclopentadiene • cyclopentadiene cation is not aromatic because it has only 2 pairs of electrons •
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Conclusion: Addition reaction of Alkenes: Bromination of (E)-Stilbene 1. Addition reaction is a reaction that involved two molecules that combine to make a larger product. Addition reaction has two main types‚ electrophilic addition and nucleophilic addition. An electrophilic reaction is when the pi bond of a molecule is removed to make two covalent bonds that are bonded to two new molecules. A nucleophillic addition is a reaction that removed the pi bond from a molecule and adds covalent
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Trans-resveratrol has long been known to exhibit antioxidant properties owing to the presence of three hydroxyl group which can readily scavenge any free radical either by donating a hydrogen atom or by forming a non radical product with the radical. Reactive oxygen species (ROS) and reactive nitrogen species (RNS)‚ the most potent of free radicals have been shown to be involved in initiation of heart and cancer related diseases by damaging DNA and other macromolecules in the body. It is associated
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