acid‚ which has the phenolic and carboxylic acid groups that causes irritation in the lining of the stomach‚ mouth and the throat. Thus‚ acetyl anhydride was added to salicylic acid and the reaction synthesises acetylsalicylic acid‚ which contains an ester group. The addition of acetyl anhydride causes the phenolic group in salicylic acid to change to an acetyl group‚ R—OH R—OCOCH3 Hydroxyl group Acetyl group However‚ in order for
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¬ First of all‚ I want to give some definition of the following: o Initiators: People who first recognize a problem which may require the purchase of a product or service o Gatekeepers: People who control information or access to decision makers. o Influencers: People who influence the purchase decision by setting specifications or by providing information about evaluating alternatives. o Deciders: Higher level managers who have power to approve suppliers and final purchase decisions. o Buyers: People
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HDL cholesterol HDL is important because it removes free cholesterol from extra hepatic tissues. It also transfers cholesterol esters to VLDL or delivers them to the liver: There‚ HDL is degraded and cholesterol is released. These actions improve the ability to move cholesterol to sites where it is required. Additionally‚ the movement of free cholesterol and cholesterol esters help prevent cholesterol deposit and plaque buildup in blood
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peplus in Australia.It is a diterpene ester‚ it is the active form of the drug and not considered as a prodrug. It is obtained from the aerial parts of the plants followed by extraction and purification. This plant has being used in traditional herbal remedy to a variety of ailments‚ including skin cancers and keratosis (Nielsch U;Fuhrmann U;Jaroch S. 2004) .Component extraction research of this plant resulted in the identification of a number of diterpene esters which all were capable of producing
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characteristics of ales and lagers are referred to as hybrids. An ale is any beer that is brewed using only top-fermenting yeasts‚ and typically at higher temperatures than lager yeast. Because ale yeasts cannot fully ferment some sugars‚ they produce esters in addition to alcohol‚ and the result is a more flavourful beer with a slightly "flowery" or "fruity" aroma resembling but not limited to apple‚ pear‚ pineapple‚ grass‚ hay‚ plum or prune. Stylistic differences among ales are more varied than those
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Callam 1/8 CHEM – 254 – WI -2009 Problem Set #1 – IR Spectroscopy - KEY 1. Which of the indicated bonds absorbs at the higher frequency in an IR spectrum? a. O or OH C=O > C-O b. N or NH C=N > C-N c. H or H C-H sp2 > C-H sp3 Callam 2/8 CHEM – 254 – WI -2009 2. What major IR absorptions are present above 1500 cm-1 for each compound? a. b. O sp3 C-H stretch 2950 C=O - ketone 1715 cm-1 cm-1 c. O sp3 C-H stretch 2950 cm-1 sp3 C-H stretch 2950 cm-1
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A Report of Experiment 1 Purification and Identification of An Unknown Mixture Aim To separate a mixture of a neutral (ester‚ alcohol‚ ketone‚ aldehyde or ether) and an acidic compound (phenol or carboxylic acid) or a neutral and a basic compound (amine)‚ and to identify the unknown mixture by physical (M.P. or B.P.) and spectroscopic methods (NMR‚ IR and MS). Method The mixture (sample number: 27) was dissolved in 200 mL of CH2Cl2 and then extracted with 10% NaOH. The acid was removed
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International Journal of Chemical and Analytical Science ISSN: 0976-1206 Research Article www.ijcas.info Physico-Chemical Characterization of Rubber Seed Oil (Hevea Brasiliensis) - A Promising Feedstock for Biodiesel Production VN Meena Devi*1‚ P Nagendra Prasad2‚ L Arul Mary Syndia2 ‚ M Rajakohila1 ‚ and VN Ariharan2 *1Department of Physics‚ Noorul Islam Centre for Higher Education‚ Noorul Islam University‚ Kumaracoil‚ Thuckalay – 629 180‚ Tamilnadu‚ India 2Department of Biotechnology‚ Sri Paramakalyani
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MATERIALS REVOLUTION UNIT REVISION BOOKLET Vikram Mahal How To Use this Booklet: This booklet has been created by addressing all the points on the OCR B salters specification for the section‚ what’s in medicine. I advise reading through the Book‚ highlighting or underlining words written in ALL CAPITALS. I also suggest making a spider diagram or mind map to summarise key points and help the information here stick in your mind. You could also draw your own images by points on this
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Alcohols CH3CH2OH ethanol – OH (a) Add solid PCl5: White fumes of HCl liberated C2H5OH + PCl5 → C2H5Cl + POCl3 + HCl(g) (b) Add glacial ethanoic acid and a few drops of concentrated sulphuric acid and heat: Fragrant fruity smell of ester liberated CH3COOH + C2H5OH → CH3COOC2H5 + H2O Appendix Ace Ahead Chem (Appendix) 3rd (11/11/08).indd 1 1 11/13/08 12:36:33 PM Homologous series/ Typical compound Aldehydes CH3CHO ethanal Functional group(s) H ⏐ –C=O Chemical
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