Wittig Reaction and Photoisomerization Abstract: For this laboratory experiment stilbene was produced through a Wittig reaction with benzyltriphenyl phosphonium and benzaldehyde producing a form of stilbene (Figure 1). This reaction favored a crude Z-Stilbene crystal product over its E counterpart. When Z-Stilbene underwent photoisomerization with iodine for 1 hour it reconfigured almost exclusively into its more stable counterpart E-Stilbene. The reaction produced very low yield of 6.3% due
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Carbonate Rocks and Dunham’s Classification Palkowski‚ Daniel N. 245-002 General Geology Dr. Wayne Schlipp 9 December 2007 Abstract The following contains a compendium of research on carbonate rocks. Displayed are a basic description of carbonate rocks‚ depositional environments‚ mineralogy‚ ancient and modern reefs‚ diagenesis‚ facies analysis‚ and classification. Most carbonate rock classification schemes take into account characteristics that may require intensive microscopic
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Dating Dating techniques are procedures used by scientists to determine the age of a specimen. 2 types of Dating: *Relative Dating *Absolute Dating Relative Dating -methods tell only if one sample is older or younger than another sample. -They do not provide an age in years. Stratigraphy -Main Relative Dating Method -is the study of layers of rocks or the objects embedded within those layers. -based on the assumption that deeper layers were deposited earlier‚ and thus are older than
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Lady Jewellyn G.Diola*‚ Jennika Joy L. Casin‚ Andrian R. De Leon‚ Jan Rotsen Kyle A. Delos Santos Department of Chemistry‚ College of Science *Lady Jewellyn G. Diola; ladyjewellyndiola@yahoo.com Abstract Synthesis of 3‚4-dihydro-3-(p-methylphenyl)-1‚2-(2h)-benzoxazine involves the nucleophillic addition of the 1 °amine group upon the carbonyly group of the salicylaldehyde‚ the reduction of imine to amine and the addition of paraformaldehyde to proceed ring closure. The
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! Isolation of the Components of BC Powder Introduction Aspirin‚ Caffeine and Salicylamide were extracted from an over-the-counter pain reliever (BC Powder). These components were separated by manipulating their solubilities by adjusting the acidity and basicity of the solution. By doing this‚ the three components were forced into conjugate acid (or base) forms‚ causing selective solubility in either an aqueous or organic solvent. These layers were then separated by use of a separation funnel
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Materials Science-Part II • Instructor: Dr. Lou X. W. (David) • Textbook: Materials Science and Engineering: An Introduction‚ by William D. Callister‚ 7th Edition • Office: N1.2-B1-09 • Email: xwlou@ntu.edu.sg • www.ntu.edu.sg/home/xwlou/ • Lecture: LT12‚ Thursdays 10:30 am – 12:30 pm • Tutorials: B12‚ TR18‚ Mondays 9:30 – 10:30 am • • B11‚ TR18‚ Mondays B10‚ TR18‚ Fridays 10:30 – 11:30 am 2:30 – 3:30 pm • • • • Tutorials weeks will be announced. CA: 2 Homeworks; 30% (50x30%=15 marks) Office
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4-hydroxy-4‚4-diphenylbutn-2-one was a three week multi-step project. The steps involved protecting the ketone of ethyl acetoacetate with a ketal group‚ followed by preparation and reaction with Grignard‚ then purification by extraction and recrystallization. The yield was 78.5%‚ but there are impurities present suggested by 1H-NMR‚ IR‚ and TLC. However‚ the results do indicate the desired hydroxyketone was formed. Introduction: The purpose of this multi-step lab was to synthesize 4-hydroxy-4
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Inorganica Chimica Acta 357 (2004) 3825–3835 www.elsevier.com/locate/ica Synthesis‚ crystal structures‚ and molecular hyperpolarizabilities of a new Schiff base ligand‚ and its copper(II)‚ nickel(II)‚ and cobalt(II) metal complexes Pascal G. Lacroix a b a‚* ‚ Frdric Averseng a‚ Isabelle Malfant a‚ Keitaro Nakatani e e b Laboratoire de Chimie de Coordination du CNRS‚ 205 route de Narbonne‚ 31077 Toulouse‚ France PPSM‚ Ecole Normale Suprieure de Cachan‚ URA 1906‚ Avenue du Pdt Wilson
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OBJECTIVE: The experiment was carried out to investigate the effects of the increase in the enzyme concentration on the rate of reaction. By using self investigative and experimental skills‚ the experiment was done in order to determine how the rate of reaction will be altered‚ whether it will increase‚ decrease or remain constant when the different concentration of enzymes added. INTRODUCTION: Enzymes are produced naturally in plant‚ animal‚ and microbial cell. There are thousands of different
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Monica Perez Experiment 8: Acetylsalicylic Acid Experiment 01/25/2013 CHM Lab- 2211 Sec 0016 Instructor: Jennifer Reed Introduction: Commonly used as Aspirin‚ acetylsalicylic acid is an analgesic (pain reliever)‚ which is one of the products of the esterification reaction between salicylic acid and acetic anhydride. This esterification occurs since the hydroxyl group from the salicylic acid reacts with acetic anhydride to form an ester. In this experiment‚ we will be able to recreate
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