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Monday, May 18, 2020 | History

4 edition of Vinyl ether hydrolysis in aqueous solution found in the catalog.

Vinyl ether hydrolysis in aqueous solution

Mordechai Leibovitch

Vinyl ether hydrolysis in aqueous solution

by Mordechai Leibovitch

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Published by National Library of Canada = Bibliothèque nationale du Canada in Ottawa .
Written in English


Edition Notes

SeriesCanadian theses = Thèses canadiennes
The Physical Object
FormatMicroform
Pagination3 microfiches : negative.
ID Numbers
Open LibraryOL14712488M
ISBN 100315740930
OCLC/WorldCa29911953

  A series of amphiphilic polyisobutylene-block-poly(vinyl alcohol) (PIB-b-PVA) copolymers of constant PIB and varying PVA block length was synthesized by living carbocationic polymerization and their solution behavior was synthesis involved the preparation of polyisobutylene-b-poly(tert.-butyl vinyl ether) followed by hydrolysis with hydrogen by: 9. In typical reactions, the alkoxy (OR′) group of an ester is replaced by another group. One such reaction is hydrolysis The reaction of a substance with water., literally “splitting with water.” The hydrolysis of esters is catalyzed by either an acid or a base. Acidic hydrolysis is simply the reverse of esterification.

The invention yet further provides the use of a partially hydrolysed polyvinyl acetate polymer or copolymer as a dispersion stabilizer in suspension polymerization of a vinyl compound, the polymer or copolymer being characterised by the ratio of absorbance at nm of a wt% aqueous solution of the vinyl alcohol polymer to the absorbance at. Rates of hydrolysis catalyzed by dilute perchloric acid were measured for the vinyl ethers MeOC(SiMe3) CH2, EtOC(SiMe3) CH2, cis‐EtOCH CHSiMe3, MeOC(t‐Bu) CH2 and EtOC(t‐Bu) CH2 in wholly aqueous solution and for MeOCH CH2, MeOC(SiMe3) CH2 and MeOC(t‐Bu) CH2 in ethanol—water (), in order to assess the effects of silyl substitution on the stability of the .

VEMA family are shown below. Methyl vinyl ether is reacted with maleic anhydride to produce the strictly alternating copolymer of various molecular weights in the anhydride form. The anhydride is converted to the acid form by hydrolysis. The anhydrides can also be . The calculated half-lives for hydrolysis of butyl vinyl ether are hours, 40 days, and years at pH 5, 7, and 9, respectively(5,SRC). According to a classification scheme(6), an estimated BCF of 7(3,SRC), from butyl vinyl ether's water solubility(2), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Limited.


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Vinyl ether hydrolysis in aqueous solution by Mordechai Leibovitch Download PDF EPUB FB2

The kinetics of the acid-catalysed hydrolysis of ethyl vinyl ether in aqueous solution have been measured by following the disappearance of the ether and by following the appearance of acetaldehyde; the two methods give identical rate constants. The reaction is first-order in ethyl vinyl ether Cited by: Flash photolytic generation and study of ketenes: acid-catalysed hydration in aqueous solution.

Journal of Photochemistry and Photobiology A: Chemistry57 (), DOI: /(91) Jean Rouchaud, Fabrice Gustin, Claude Moulart, Marc by: Rates of hydrolysis of the vinyl ether functional groups of (Z)‐ and (E)‐β‐methoxyacrylic acid and (Z)‐and (E)‐β‐methoxymethacrylic acid and their methyl esters were measured in aqueous perchloric acid onal rate measurements were also made for one substrate, (Z)‐β‐methoxymethacrylic acid, in buffer solutions down to pH 7, and a rate profile was by: 4.

An argument is presented which suggests that hydrolysis of the vinyl ether group of 1-methoxycyclooctene may occur by reversible proton transfer from a catalyzing acid to the β-carbon atom Cited by: 3.

Rates of hydrolysis of cis- and trans-β-phenylvinyl methyl ethers, cis- and trans-β-(p-nitrophenyl)vinyl methyl ethers, and cis- and trans-β-cyanovinyl ethyl ethers were measured in concentrated (10–55 wt%) aqueous perchloric results show that these cis and trans isomers do not interconvert under the hydrolysis reaction conditions, and that formation of the alkoxy carbonium ion Cited by: The mechanism of vinyl ether hydrolysis D.

Jones and N. Wood, J. Chem. Soc.,DOI: /JR If you are not the Authors contributing to RSC publications (journal articles, books or book chapters) do not need to formally request permission to reproduce material contained in this article provided that the correct Cited by: 2-Chloroethyl vinyl ether is subject to hydrolysis at low pH.

Dehydrohalogenation may result in degradation of aqueous solutions of pentachloroethane and to a lesser extent, other halogenated compounds (e.g., dichlorobutenes and 1,1,2,2-tetrachloroethane) to.

Data on the hydrolysis of ethyl acetate in aqueous solutions of strong acids were analyzed. At 25° in HCl, HBr, HCIO 4, and H 2 SO 4 (up to 84% by mass), hydrolysis occurs through an activated complex, formed from the nonionized form of the ester, the H 3 O + ion, and the nucleophile (molecules of water and nondissociated acid, anions and Author: M.

Vinnik, N. Librovich. Vinyl $\mathrm{sp^2}$ cations are very unstable and an $\mathrm{S_N1}$-type dissociation of MeOH is very unlikely. 1 Instead, you need to use the fact that an enol ether is very much like an enol.

It is nucleophilic on the α-carbon, and you can protonate it on that carbon, almost like you are tautomerising an enol back to a ketone. Acid-catalyzed vinyl ether hydrolysis is a reaction that occurs by rate-determining electrophilic addition of a proton to the ß-carbon atom of the vinyl ether group,6 eq.

1, CH2=CHOR + H+. The acid-catalyzed hydrolysis of methyl α-(2,6-dimethoxyphenyl)vinyl ether in aqueous solution at 25 °C occurs with the hydronium ion catalytic coefficient and gives the solvent isotope effect this.

The influence of comonomer species and concentration on the ease of alkaline hydrolysis of vinyl acetate copolymers in the aqueous dispersion form is reported.

The comonomers studied include higher vinyl esters, acrylic esters, a fumaric diester, and ethylene. The significance of the emulsion polymerization formulation has also been by: Flash Photolysis of 2,2,6-Trimethyl-4H-1,3-dioxinone in Aqueous Solution: Hydration of Acetylketene and Ketonization of Acetoacetic Acid Enol.

Journal of Cited by: Liposomes comprising lipids containing vinyl ether linkages have been produced that contain a photosensitizer within the lipid bilayer and a therapeutic payload in the inner aqueous compartment.

Irradiation of the liposomes leads to the generation of reactive oxygen species by the photosensitizer, photo-oxidizing the vinyl ether lipids, disrupting the liposome integrity, causing the leakage of its. 2-Chloroethyl vinyl ether is subject to hydrolysis at low pH. Dehydrohalogenation may result in degradation of aqueous solutions of pentachloroethane and to a lesser extent, other halogenated compounds (e.g.

The hydrolysis of octachlorodipropyl ether (OCDPE) was investigated in aqueous solutions under a variety of pH conditions (pH ), temperatures ( °C) and with the initial concentrations of OCDPE ( mg L-1).OCDPE hydrolysis was found to obey the first-order model and similar rate constant values ranging from ± to ± day-1 were obtained at different Cited by: 1.

The cyclic vinyl ether 2,3-dihydro-1,4-dioxin is converted into its cyclic hemiacetal hydration product, tetrahydrohydroxy-1,4-dioxin, in aqueous solution by an acid-catalyzed reaction 〈87OK, 89JPO43〉. Treatment of an alcohol with excess of 2,3-dihydro-1,4-dioxin at room temperature in the presence of copper(II) bromide in.

Rates of acid-catalyzed hydrolysis of the vinyl ether group of 4-methoxy-1,2-dihydronaphthalene were measured in dilute aqueous perchloric acid solutions and also in a series of carboxylic acid buffers.

These data give the hydronium-ion isotope effect kH/kD = and provide a Brønsted relation with the exponent α = For aqueous samples with no residual chlorine present, the previous version of SW Chapter 4 Table 4‐1 recommended that "If vinyl chloride, styrene, or 2‐chloroethyl vinyl ether are analytes of interest, collect a second set of samples without acid preservatives and analyze as soon as possible.".

Rates of vinyl ether hydrolysis catalyzed by the hydronium ion are reported for 14 substrates in HâO solution and for 20 substrates in DâO solution. Mole Concept - Some Basic Concepts of Chemistry: JEE Main Pattern Questions Exercise -1 | Misostudy - Duration: MISOSTUDY - JEE NEET CBSE ONLINE COACHINGviews form-methanol (4:l) and ml of water.

The aqueous layer, containing water-soluble salts, and the fluffy protein layer were dish.:ded. The chloroform layer was evaporated to dryness, and the vinyl ether was assayed potentiometrically by the method of Norton (11). The decrease in vinyl ether indicated the ex.This work offers a comprehensive review of surfactant systems in organic, inorganic, colloidal, surface, and materials chemistry.

It provides practical applications to reaction chemistry, organic and inorganic particle formation, synthesis and processing, molecular recognition and surfactant templating. It also allows closer collaboration between synthetic and physical practitioners in.