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Sunday, July 12, 2020 | History

2 edition of Anion chemistry of cyclic vinyl ethers found in the catalog.

Anion chemistry of cyclic vinyl ethers

Richard W Saylor

Anion chemistry of cyclic vinyl ethers

by Richard W Saylor

  • 141 Want to read
  • 11 Currently reading

Published .
Written in English

    Subjects:
  • Ethers,
  • Organic compounds -- Synthesis

  • Edition Notes

    Statementby Richard W. Saylor
    The Physical Object
    Paginationvi, 95 leaves :
    Number of Pages95
    ID Numbers
    Open LibraryOL14055534M

    Ethers are a class of organic compounds that contain an ether group—an oxygen atom connected to two alkyl or aryl groups. They have the general formula R–O–R′, where R and R′ represent the alkyl or aryl groups. Ethers can again be classified into two varieties: if the alkyl groups are the same on both sides of the oxygen atom, then it is a simple or symmetrical ether, whereas if they. One way to make ethers is to use the Williamson ether synthesis, which is where you start with an alcohol, and you add a strong base to deprotonate the alcohol. Once you deprotonate the alcohol, you add an alkyl halide, and primary alkyl halides work the best. We'll talk about why in a minute.

    OChemPal is an A-to-Z guide to the rich vocabulary of organic chemistry. Designed for undergraduate students studying organic chemistry, it is intended to be complementary to . Ethers. Ethers are organic compounds in which an oxygen atom is connected to two carbon kurt-haspel.com alcohols, ethers are fairly unreactive (except towards combustion). They are very common organic solvents, and some ethers also make good anesthetics.. Simple ethers are named by naming the alkyl groups in alphabetical order and adding the word "ether" to the end.

    Ether, any of a class of organic compounds characterized by an oxygen atom bonded to two alkyl or aryl groups. Ethers are similar in structure to alcohols, and both ethers and alcohols are similar in structure to water. In an alcohol one hydrogen atom of a water molecule is replaced by an alkyl. Jan 01,  · Cryptands and Cryptates has been written as a coursebook, structured as a series of lectures for graduate students or advanced researchers in chemistry, materials science, chemical biology and nanotechnology. It is fully illustrated to show experiments and results, and is intended to stimulate further interest in this fertile field of.


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Anion chemistry of cyclic vinyl ethers by Richard W Saylor Download PDF EPUB FB2

Relative anion stabilities and transition state energies regarding vinylic vs allylic deprotonation of cyclic vinyl ethers by organolithium reagents: An ab initio study. Tetrahedron54 (29), Cited by: CYCLIC VINYL ETHER CARBANIONS I: SYNTHETIC EQUIVALENTS OF ~ ACYLVINYL AND SUBSTITUTED ACYL ANIONS Robert K.

Boeckrnan, Jr. and Kenneth J. Bruza Department of Chemistry, Wayne State University, Detroit, Michigan (Received in USA 31 August ; received in UK for publication 11 October ) In connection with synthetic studies in the Cited by: A Nomenclature of Cyclic Ethers. Ring compounds containing nitrogen, oxygen, sulfur, or other elements as ring atoms generally are known as heterocyclic compounds, and the ring atoms other than carbon are the hetero atoms.

Over the years, the more common heterocyclic compounds have acquired a hodge-podge of trivial names, such as ethylene oxide, tetrahydrofuran, and dioxane. Proton affinities of vinyl and allyl anions of cyclic vinyl ethers and cycloalkenes obtained at the B3PW91 level with Davidson's modification of basis set aug-cc-pVDZ are presented to further explore deprotonation reactions of cyclic vinyl ethers.

The presence of an oxygen atom α to a vinyl anion has a clear acidifying kurt-haspel.com by: 4. Physical Organic Chemistry ChemInform Abstract: Relative Anion Stabilities and Transition State Energies Regarding Vinylic vs Allylic Deprotonation of Cyclic Vinyl Ethers by Organolithium Reagents: An ab initio kurt-haspel.com: T.

Power, J. Sebastian. Relative anion stabilities and transition state energies regarding vinylic vs allylic deprotonation of cyclic vinyl ethers by organolithium reagents: An ab initio study. Tetrahedron54 (29), DOI: /S(98) Trevor D.

Power, John F. kurt-haspel.com by: The controlled copolymerization of cyclic acetals with isobutyl vinyl ether, which is a more reactive VE than CEVE, also proceeded, and the frequencies of the crossover reactions were lower. The key factors affecting the crossover reactions are discussed on the basis of the reactivities of the vinyl monomers and cyclic Author: Kazuya Maruyama, Arihiro Kanazawa, Sadahito Aoshima.

However, synthesis of tailor-made cyclic polymers with conventional living polymerization methods are still a challenging subject, especially for addition polymerization of acyclic vinyl monomers. We have recently realized ring-expansion cationic polymerization of vinyl ethers by using a hemiacetal ester embedded cyclic initiator that is easily synthesized.

Hydrobromic and hydroiodic acids are especially useful for ether cleavage because both are strong acids and their anions are good nucleophiles.

Tertiary alkyl ethers are very easily cleaved by acid reagents: Ethers are susceptible to attack by halogen atoms and radicals, and for this reason they are not good solvents for radical reactions. Symmetrical ethers can be prepared by treating the corresponding alcohol with a strong acid Limitations: must be symmetrical works best for 1° alcohols Williamson Ether Synthesis Reaction of metal alkoxides with alkyl halides or tosylates to give ethers.

This is an S N2 reaction. Alkoxides are prepared by the reaction of an alcohol with a. Vinyl ethers are well established as radiation curable materials exhibiting a wide diversity of chemistry 1].

A good selection of reactive monomers and prepolymers is commercially available. These materials possess several attractive features such as low toxicity and high reactivity. The cationic cure (both uv and eb initiated) of these materials is particularly rapid often.

Before turning to the specific chemistry of alcohols and ethers, we re- mind you that the naming of these compounds is summarized in Sections and The special problems encountered in naming cyclic ethers are dis- cussed in Section 1 1A.

Exercise a. Ethers can be derived from alcohols. The functional group of ethers is R-O-R (instead of R-O-H in an alcohol). Ethers can be viewed as a water molecule in which both H atoms are replaced with alkyl groups.

Ethers may exist in straight chain carbons (acyclic) or as part of a carbon ring (cyclic). Abstract Deprotonation of alkyl and vinyl carbon-hydrogen bonds for synthetic purposes is often hindered not merely by the need for an exceptionally strong base, but by the inherent instability of the resultant anion.

Metalation of cyclic ethers adjacent to oxygen, for example, has invariably initiated a ring-opening decomposition pathway.

Observation of the ESR spectrum of the DDQ radical anion and the isolation of a addition product of DDQ and alkyl vinyl ether when the two are mixed in a ratio and quenched in alcohol support an initiation mechanism involving a coupling reaction of the donor monomer (radical cation) and the acceptor initiator (radical anion).Cited by: 8.

Oct 30,  · Deprotonation of alkyl and vinyl carbon-hydrogen bonds for synthetic purposes is often hindered not merely by the need for an exceptionally strong base, but by the inherent instability of the resultant anion.

Metalation of cyclic ethers adjacent to oxygen, for example, has invariably initiated a ring-opening decomposition pathway.

Terminal chelation-controlled Heck vinylations of electron-rich amino-functionalized vinyl ethers were performed with high regioselectivity furnishing moderate to good isolated yields of the. Ch14 Ethers and Epoxides (landscape).docx Page 3 Nomenclature of ethers Common names of (symmetrical) ethers add the suffix ether after naming the groups on either side of the oxygen.

IUPAC names ethers by taking the more complex alkyl group as the root name, and naming the remaining part as an alkoxy group. Cyclic Ethers Naming these heterocyclic compounds depends on the ring size.

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A ‘Ga'llant couple: The α‐alkenylation of esters was accomplished by GaBr 3 ‐catalyzed coupling between alkenyl ethers and ketene silyl acetals. In this reaction system, various alkenyl ethers, including those with vinyl and substituted alkenyl groups, were applicable, and the scope of applicable ketene silyl acetals was sufficiently broad.

Ethylene Oxide Vinyl Ether Propylene Oxide Crystalline Polymer Stannic Chloride These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm kurt-haspel.com by: The chloride anion templated synthesis of an electrochemical anion sensory interlocked host system, prepared by the integration of redox-active 1,2,3,4,5-pentaphenylferrocene stopper groups into.Ether cleavage refers to chemical substitution reactions that lead to the cleavage of ethers.

Due to the high chemical stability of ethers, the cleavage of the C-O bond is uncommon in the absence of specialized reagents or under extreme conditions conditions. In organic chemistry, ether cleavage is an acid catalyzed nucleophilic substitution reaction.

Depending on the specific ether, cleavage can follow .