Abstract In this experiment‚ 4-(4-chlorophenyl)-3‚4-dihydropyrimidine-2-one is synthesized in a solvent-free reaction‚ where urea‚ ethyl acetoacetate‚ 4-chlorobenzaldehyde are used as the reactants and p-toluenesulfonic acid is used as the catalyst. This reaction is similar to the original synthesis of DHPM by Pietro Bignelli‚ as it incorporates a single step. Due to its environmentally friendly conditions‚ such as the use of solar energy as a heat source and the lack of solvent‚ this synthesis of
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electrons are involved in each covalent bond? a) 1 b) 2 c) 4 d) 6 e) 8 6. An amino acid always has an amino group‚ as its name suggests. What other group is also present in all amino acids? a) a methyl group b) a carboxyl group c) an aldehyde group d) a hydroxyl group e) a carbonyl group 7. The following structural formula is representative of which functional group? a) sulfhydryl b) carboxyl c) hydroxyl d) amino e) carbonyl 8. The following structural formula is representative
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Tattoo culture and influence in society Nowadays‚ tattoo has been regarded as a sign of fashion. “A trend that started growing in America and Europe in the early ’90s‚ tattooing soon became so popular that 36% of Americans aged 25-29 had at least one body tattoo by 2003(Julie Genser 2007).” However‚ tattoo could probably bring health risks to tattoo carrier. Historically‚ tattoo originally is the nation’s cultural and symbolic‚ different tattoo pictures have own meaning and even it is a symbol of
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Steam Distillation of Lemongrass Oil I. Introduction When a mixture of cyclohexane and toluene is distilled‚ the boiling point of these two miscible liquids is between the boiling points of each of the pure components. By contrast‚ if a mixture of benzene and water (Immiscible liquids) is distilled‚ the boiling point of the mixture will be found below the boiling point of each pure component. Since the two liquids are essentially insoluble in each other‚ the benzene molecules in a droplet of
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reaction of 2-pentanol (1b) with NaBr/H2SO4 was 2-bromopentane and the reaction of 2‚4-dimethyl-3-pentanol with HCl/ZnCl2 was 2‚4-dimethyl-3-chloropentane. Background: Alcohols are capable of being converted to metal salts‚ alkyl halides‚ esters‚ aldehydes‚ ketones‚ and carboxylic acids. In this experiment the conversion from alcohol to alkyl halides was investigated. Alkyl halides are a group of chemical compounds derived from alkanes containing one or more halogens. They are used as flame retardants
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Amino Acids Glycine is the smallest of the amino acids. It is ambivalent‚ meaning that it can be inside or outside of the protein molecule. In aqueous solution at or near neutral pH‚ glycine will exist predominantly as the zwitterion. Alanine is a hydrophobic molecule. It is ambivalent‚ meaning that it can be inside or outside of the protein molecule. The α carbon of alanine is optically active; in proteins‚ only the L-isomer is found. Serine differs from alanine in that one of the methylenic
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Mechanisms of Acetaminophen-lnduced Liver Necrosis By Jack A. Hinson‚ Dean W. Roberts‚ and Laura P. James Acetaminophen (paracetamol‚ N-acetyl-p-aminophenol; APAP) is widely used as analgesic and antipyretic drug. At therapeutic doses‚ acetaminophen is safe to be used. Acetaminophen other than aspirin and ibuprofen has only weak anti-inflammatory properties. At higher doses‚ acetaminophen produces a centrilobular hepatic necrosis that can be fatal. Acetaminophen-lnduced Hepatotoxicity Observation/
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E N Z Y M E O N O S M C E G L E E E L G L Y C E R O L H Y D R O X
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Food Chemistry: Option F Food Groups: F.1 Food & Nutrients Food: any substance‚ whether processed‚ semi-processed or raw‚ which is intended for human consumption‚ and includes drinks‚ chewing gum and any substance which has been used in the manufacture‚ preparation or treatment of “food” but does not include cosmetics or tobacco or substances used only as drugs. Nutrients: any substance obtained from food and used by the body to provide energy‚ to regulate growth‚ and to maintain and repair
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Analysis of Solid Samples 3.8 Multi-Component Analysis 3.9 Calibration Methods References Contents 4 Organic Molecules Introduction Aliphatic Hydrocarbons Aromatic Compounds Oxygen-Containing Compounds 4.4.1 Alcohols and Phenols 4.4.2 Ethers 4.4.3 Aldehydes
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