Page 1 of 1 - About 9 Essays
  • Indole 2a Lab Report

    Our initial investigation of the asymmetric Mannich reaction of indole 2a with phenyl α-amidosulfone 3a is summarized in Table 1. The effect of catalyst structure on the reaction outcome was first investigated at 10 mol% catalyst loading in toluene (Table 1, Entries 1–5). As we expected, based on our knowledge of the catalytic performance of chiral oligoEG 1,[7] the ether chain length (Entries 1–3) as well as suitable acidity of the phenolic protons (Entry 2 vs. Entries 4 and 5) are critical for the catalytic performance in this reaction. Consistently, catalyst 1b bearing iodine atom at the 3 and 3′ positions of the binaphthyl scaffold showed the best results in terms of catalytic activity (70% yield) and enantioselectivity (98% ee) (Entry 2, Table 1). In further experiments using (R)-1b as the optimal catalyst, different solvents were examined (Entries 6–10). In general, excellent enantioselectivity was obtained in all the solvents tested in this study. Among them, m-xylene proved to be the best in terms of yield (75%) and asymmetric induction (99% ee) (Entries 8–10). Further improvement of the yield was achieved by increasing the equivalents of indole (83% yield and 99% ee, Entry 11). Table 1. Optimization of the BINOL-based polyether catalyzed asymmetric Friedel-Crafts (FC) reactions of indole [a] Entry Catalyst Indole 2a (equiv.) Solvent Yield (%)[b] ee (%)[c] 1 (R)-1a 1.0 Toluene 68 61 2 (R)-1b 1.0 Toluene 70 98 3 (R)-1c 1.0 Toluene 59 80 4 (R)-1d 1.0 Toluene 24 1…

    Words: 868 - Pages: 4
  • Gabriel Amine Vs Pyrrole Lab Report

    Basicity of Pyridine vs Pyrrole The lower the pKb value of a compound, the stronger a base it is. Since pyridine has a lower pKb value, it is a stronger base than pyrrole. In this example, we cannot use either the steric factor or inductive factor to explain their basicity. Instead, we have to look at the hybridization state of the respective nitrogen atoms. The nitrogen atoms in pyrrole and pyridine are sp2 hybridized because they satisfy the following two conditions: 1) the atom has at least…

    Words: 1349 - Pages: 6
  • Microscopyrrole Synthesis Essay

    (PPy-Au NCs) by the chemical oxidative polymerization of pyrrole with ferric chloride as an oxidizing agent, in the presence of a colloidal suspension of gold nanoparticles. Gold nanoparticles (Au NPs) were synthesized by standard citrate reduction method. Au NPs and PPy-Au NCs were characterized by Transmission Electron Microscopy (TEM), Atomic Forced Microscopy (AFM), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD)…

    Words: 1011 - Pages: 5
  • Friedel-Crafts Synthesis Of Glyoxylates

    not increase even at 70 °C.[17] Thus at 70 °C, the reaction was completed within 10 h, affording the product in 79% and 99% ee. Thus, the substrate scope was then investigated at 70 °C. Substituted indoles 2, containing either electron-donating groups or electron-withdrawing groups at the ortho, meta and para-position of the phenyl ring, were tested in the reaction with α-amidosulfone 8 (Scheme 5). In all the cases, moderate yields and excellent ees were achieved for the desired…

    Words: 843 - Pages: 4
  • Hydroperoxy Test Lab Report

    discovered, most of these enzymes catalyze degradation of environmental pollutants. Chlorophenol 4-monooxygenase was isolated from Burkholderia cepacia AC1100 catalyzes hydroxylation and de-chlorination of 2, 4, 6-trichlorophenol (30, 31). Hydroxylation of p-nitrophenol is carried out by the two-component monooxygenase in Bacillus sphaericus JS905 (32). Degradation of metal chelators such as oxidation of EDTA is carried out by the enzyme isolated from bacterial strains DSM9103 and BNC1 (33, 34)…

    Words: 767 - Pages: 4
  • Porphyria Research Paper

    of hemoglobin which is a protein in red blood cells that carries oxygen from the lungs to the rest of the body. It also is an iron-containing compound used throughout the body in the role of breaking down chemicals so they can be removed from your body. (Kujtan 2005). Heme is made mainly in the bone marrow and the liver through the production of porphyrin and link with iron. The process of making heme is called the heme biosynthecic pathway. One of eight enzymes controls each step of the…

    Words: 1189 - Pages: 5
  • Synthesis Of Phthalocyanines

    INTRODUCTION Background The macrocyclic organic molecules Phthalocyanines (1) which are comparable to the naturally occurring porphyrin (2) ring systems shown in (Figure 1). The porphyrin molecule consists up of four pyrrole subunits which are associated in n-conjugation by methine carbons. 1 2 Figure 1: structures of phthalocyanine and porphyrins molcule The compound…

    Words: 1318 - Pages: 6
  • Lab Report Cyp1a1

    Eukaryotic P450s for the most part display longer polypeptide chains than are seen in prokaryotic P450s, and this area associates all the more widely with the N-terminal P-sheet locale, possibly constraining the opening of the protein in this heading. Major structural features responsible for the function: CYP450 1A1 is one of the group of CYP 450 enzymes that have a significant role in metabolizing xenobiotics. Studies shows that the active site of CYP450 1A1 is equal to 2.6 Å. Each enzyme of…

    Words: 1779 - Pages: 8
  • Cognitive Function And Vitamin B1

    For example, more than 2.9 million serum vitamin B12 tests were performed in 2010 in Ontario at a cost of $40 million.(Ogunkolade et al., 2013) Vitamin B12(Cobalamine) is a group of compounds with corrinoid ring (4-pyrrole rings) with cobalt (Co). Vitamin B12 are synthesized exclusively by bacteria and have different functional groups chelated to Co. (University of Aberdeen, 2016) Vitamin B12 and folate depend on each other for activation. Both vitamin B12 and folate are very important for…

    Words: 1944 - Pages: 8
  • Previous
    Page 1

Related Topics:

Popular Topics: