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Showing 1 to 20 of 47 for “"ozonolysis"”.
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SPECIATION STUDIES FOR BIOGENIC VOLATILE ORGANIC COMPOUNDS AND SECONDARY ORGANIC AEROSOL GENERATED BY OZONOLYSIS OF VOLATILE ORGANIC COMPOUND MIXTURES
… and speciation of products generated from the ozonolysis of VOCs. The impact of PM on human health and climate are summarized. A literature survey on the VOCs that are precursors to SOA and present in the outdoor and indoor environment is presented along with factors that may lead to …
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Evaluating the Utility of an Atmospheric Pressure Chemical Ionization Mass Spectrometer for Detecting Organic Peroxides During Beta-Pinene Ozonolysis Experiments
… organic peroxide products formed during β-pinene ozonolysis experiments. Detection was based on utilizing the neutral-loss scan (NLS) analysis mode of the APCI-MS/MS to observe ion signals exhibiting unique mass losses of 34 u. This mass loss was considered exclusive to protonated organic …
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Routes to drimanes from podocarpic acid
The synthesis and ozonolysis of the 6- and 7-substituted 12-hydroxypodocarpatrienes (26), (86), (90), and (98), as a possible route for the synthesis of drimanes from 12-hydroxypodocarpa-8,11,13-trien-19-oic acid (podocarpic acid) (9) has been investigated. Modification of the aromatic ring of (9) …
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Osmium Catalyzed Dihydroxylation And Oxidative Cleavage Of Vinyl Sulfone And Elucidation Of The Vinylsulfone Polypropionate Methodology For The Synthesis Of The C32 Des-Methyl C28-C34 Actin Binding Tail Of Aplyronine A
… as aplyronine A. Final oxidative cleavage via ozonolysis has been shown to be difficult providing variable yields. Furthermore, elegant synthesis of the C28-C34 segment of the aplyronine A actin binding tail has proved elusive. Utilization of OsO4 and catalytic citric acid has led to a …
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Part One: Ozonolysis of Diphenylvinylene Carbonate. Synthesis and Thermolysis of Dibenzoyl Monoperoxycarbonate. Part Two: Singlet Oxygen: The Lifetime of Singlet Oxygen in Solution and Its Reaction With Ene-Type Olefins
… and is consistent with the Criegee mechanism for ozonolysis of most olefins. The thermolysis of dibenzoyl monoperoxycarbonate in benzene is also reported. The products of that thermolysis are very similar to the products of benzoyl peroxide thermolysis, but the rate of decay is significantly …
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Investigation of Ozone Initiated Ethylene Oxidation at Room Temperature: Chemistry and Flame Dynamics
… direct reaction between fuel and O3, i.e., the ozonolysis reaction. In this dissertation, the O3 initiated ethylene (C2H4) oxidation is experimentally investigated at room temperature using multiple diagnostic methods. To accommodate the rapid reaction between C2H4 and O3, a novel flow reactor …
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A computational study of the structure, bonding, and thermochemical properties of primary Ozonides derived from substituted Phenol and Thiophenol
… multiple bonds such as in alkenes via the ozonolysis process. The first step of ozonolysis involves the formation of an important but very unstable primary ozonide (POZ) which after formation, immediately rearranges to the more stable secondary ozonide (SOZ). Due to its instability, it is …
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Tandem Double Intramolecular [4+2]/[3+2] Cycloaddition of Nitro Olefins: Part I: Construction of Piperidine Rings. Part II: Construction of Vicinal Quaternary Stereogenic Centers. Part III: Progress Toward a Total Synthesis of Daphnilactone B
… a mixture of two epimeric nitroso acetals. Ozonolysis of the cycloadducts, followed by hydrogenolysis and intramolecular acylation provided the intermediates for the total synthesis that may be elaborated to daphnilactone B. Possible routes to complete the synthesis are also discussed.
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Studies of Structure and Reactivity in Monolayer Assemblies: 1. Ozonolysis of Alkanethiolate Self Assembled Monolayers on Au. 2. In-Plane Resistivity of Ultrathin Gold Films as a High Sensitivity, Molecularly Differentiated Probe of Chemisorption at the Liquid-Metal Interface
Ultrathin gold films, with thicknesses between the onset of conductivity (d ∼ 5 nm) and the electron mean free path ( d ∼ 80 nm), display surface-sensitive resistivities, which have been exploited to follow the adsorption and desorption of molecular monolayers at the metal solution …
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Observation and Nature of Non-statistical Dynamic Effects in Ordinary Organic Reactions
… most interesting reactions investigated is the ozonolysis of vinyl ethers. Ozonolysis of a homologous series of vinyl ethers in solution exhibit experimental product ratios wherein the selectivity among cleavage pathways increases with the size of the alkyl group to an extent that is far less …
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Electronic Spectroscopy, Photochemistry, And Reactivity Of Isoprene-Derived Criegee Intermediates
Ozonolysis is an important sink of alkenes in Earth’s troposphere, leading to the formation of highly reactive carbonyl oxide (R1R2C=O+O-) species known as Criegee intermediates. Ozonolysis of isoprene, the most abundant non-methane volatile organic compound emitted into the atmosphere, can …
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Spectroscopy and Photo-induced Chemistry of Atmospherically Significant Criegee Intermediates and Hydroxyl Radicals
… carbonyl oxide species important in alkene ozonolysis reactions in the atmosphere, have eluded characterization until very recently. Four prototypical Criegee intermediates, CH2OO, CH3CHOO, (CH3)2COO and CH3CH2CHOO, were generated by photolysis of gem-diiodo compounds and subsequent reaction …
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Autodocking Studies of Oxygenated Fullerenes as Inhibitors of The HIV Protease
… of C60; C60O2 had ketone functionalities by Ozonolysis of one of the double bonds of C60; C60O4, C60O6, C60O8 had ketone functionalities by Ozonolysis of successive double bonds of C60. The hydroxyl functionality was likely produced due to interaction of water and the oxygenated fullerenes. …
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Biologically Active Compounds From Caribbean Sponges
… of some of the structures was accomplished by an ozonolysis degradation sequence and formation of a lactone from the ester carbonyl and one of the peroxide oxygens and spectroscopic characterization of the derivatives.
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The microbial biochemistry of slow sand filters.
… during these months. The effect of selected ozonolysis by-products upon the growth of the isolated heterotrophic bacteria was also investigated. It was found that not all of these carbon sources supported the growth and development of the selected heterotrophic bacteria. Those ozonolysis …
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Development of Scalable and Sustainable Processes for Polymer Recycling, Upcycling, and Synthesis
… for the depolymerization of PVC was developed. Ozonolysis, while an "ancient" process, was never deployed as an approach for PVC depolymerization, only as an analytical tool. In this work, a new safe and scalable procedure for the ozonolysis of PVC was developed, yielding PVC products that are …
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The Total Synthesis of (-)-Prezizaene, (-)-Prezizanol, and Other Perzizanoid Sesquiterpenes
… Favorskii rearrangement of (+)-pulegone and ozonolysis furnished ethyl 5-methyl-2-oxo-cyclopentane carboxylate which was annelated with methyl vinyl ketone to give a mixture of diastereomeric hydrindenones. Hydrogenation to ethyl 3-methyl-6-oxo-cis-hexahydroindane-3a-carboxylate was …
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ΣΥΝΘΕΣΗ ΚΑΙ ΧΗΜΕΙΟΦΩΤΑΥΓΕΙΑ ΔΙΥΠΟΚΑΤΕΣΤΗΜΕΝΩΝ ΣΤΙΛΒΕΝΙΩΝ
… BY THE WITTIG CARBONYL OLEFINATION REACTION. THE OZONOLYSIS OF THESE STILBENOLS WAS FOUND TO BE CHEMILUMINESCENT, THE QUANTUM YIELDS (1,2X10-4 - 8,1X10-6) DEPENDING ON HAMMETT'S "6" CONSTANT FOR THE 4'- SUBSTITUENT, AND SALICYLALDEHYDE ANION WAS FOUND TO BE THE PRIMARY EMOITLER IN ALL CASES. THE …
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Structural Characterization of Sulfur-Based Monomolecular Thin Films: I. Langmuir-Blodgett Films Derived From Multisulfur Heterocycles. II. Second Harmonic Generation Studies of Alkanethiolates on Ag and Au
… systems has been measured. Ozonolysis is used to obtain partially covered hexadecanethiolate (HDT) monolayers on Au surfaces, with the coverage being controlled by the ozone exposure time and monitored by surface plasmon resonance (SPR) technique. A linear relationship …
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