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Saturday, July 11, 2020 | History

2 edition of Some aspects of the chemistry of sulphoxides and cyclic acetals. found in the catalog.

Some aspects of the chemistry of sulphoxides and cyclic acetals.

William Alan Williams

Some aspects of the chemistry of sulphoxides and cyclic acetals.

by William Alan Williams

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Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D.) - Univ. of Birmingham, Dept. of Chemistry.

ID Numbers
Open LibraryOL21353825M

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Some aspects of the chemistry of sulphoxides and cyclic acetals by William Alan Williams Download PDF EPUB FB2

A lone pair of electrons resides on the sulfur atom, giving it tetrahedral electron-pair geometry and trigonal pyramidal shape (steric number 4 with one lone pair; see VSEPR theory).When the two organic residues are dissimilar, the sulfur is a chiral center, for example, in methyl phenyl energy barrier required to invert this stereocenter is sufficiently high that.

Some acetals undergo electrochemical oxidation in the presence of methanol to give ortho-esters in reasonable yields (Equation (33)).

The reaction has been shown to be successful for 2-alkyl-1,3-dioxolanes, 2-alkyl- and 2-aryl-1,3-benzodioxoles and dimethyl acetals of benzaldehydes. Thiols are the sulfur analogs of alcohols (Section ).The sulfur atom of a thiol is a better nucleophile than the oxygen atom of an alcohol.

Thus, thiols react with aldehydes or ketones to form thioacetals or thioketals by a mechanism similar to that described for acetals and ketals. These sulfur derivatives form in high yield because the equilibrium constant for thioacetal.

Cyclic and acyclic carbohydrates react with aldehydes and/or ketones, in the presence of catalysts (hard or Lewis acids), to give cyclic acetals and/or ketals (1,3-dioxolanes 3.

Download Citation | The Chemistry of Sulphones and Sulphoxides | In a set of volumes on sulphur-containing functionalgroups, the volume on the sulphonium group appeared in (in two parts). The. Aspects of stereochemistry. Part VII. The structure of some cyclic acetals of D-glycero-D-gluco-heptitol (β-sedoheptitol).

ACS Symposium Series All Publications/Website. OR SEARCH CITATIONS. Cyclic Acetals and Ketals, Chiral Ketones, Cyclic Orthoesters, Silyl Derivatives, Cyclic Carbonates, Cyclic Boronates, 3.

Protection for Phenols and Catechols Protection for Phenols, Ethers, Silyl Ethers, Esters, Carbonates, Carbamates, Phosphinates, Sulfonates, Abstract.

Cyclic and acyclic carbohydrates react with aldehydes and/or ketones, in the presence of catalysts (hard or Lewis acids), to give cyclic acetals and/or ketals (1,3-dioxolanes 3 or 1,3-dioxanes 5, respectively) (Fig.

).This reaction is routinely used in carbohydrate chemistry for the protection of hydroxyl groups in a sugar in order to prevent their interference in chemical. Purchase The Carbohydrates Volume 1A, Volume 1A - 2nd Edition.

Print Book & E-Book. ISBN Substituted 5-membered cyclic ethers are usually unreactive, although some cyclic acetals undergo polymerization. The 6-membered cyclic ethers such as tetrahydropyran 1 and 1,4-dioxane 2 are unreactive under a wide range of reaction conditions, but the 6-membered cyclic acetal, trioxane 3, undergoes polymerization.

Open image in new window. Pummerer rearrangements and similar reactions of some six-membered cyclic sulphoxides: Synthesis of 3-deoxythiopentopyranoses branched at C Carbohydrate Research(2), DOI: /(88) M. Bhupathy, Theodore Cohen.

The first chapter discusses some aspects of protective group chemistry: the properties of a protective group, the development of new protective groups, how to select a protective group from those described in this book, and an illustrative exam- ple of the use of protective groups in a synthesis of brefeldin.

General and theoretical aspects / A. Gavezzotti --Structural chemistry of gaseous sulfoxides and sulfones / István Hargittai --Stereochemistry, conformation, and chiroptical properties of sulfoxides / Kenneth K. Andersen --Thermochemistry of sulfoxides and sulfones / John T.

Herron --Detection and determination of sulphones and sulphoxides / M. Regioselectivity in the Ring Opening of 2-Phenyl-1,3-dioxanyl Radicals Derived From Cyclic Benzylidene Acetals and Comparison with Deoxygenation of a Cyclic Carbohydrate Diol via its Cyclic Thionocarbonate.

B.P. Roberts and T.M. Smits, Tetrahedron Lett.,42, Stephen was now in a position to start work on the inositols. Few aspects of cyclitol chemistry escaped the attention of the Angyal group.

In over sixty papers, cyclic acetals, sulfonic esters, phosphoric esters, aminocyclitols and their deamination, 5-carbon cyclitols, acyl migration, tritium labelling, and selective protection were dealt with.

Đăng nhập bằng facebook. Đăng nhập bằng google. Hoặc đăng nhập bằng. Nhớ mật khẩu. Đăng nhập. Quên mật khẩu. viii, pages: 24 cm Includes bibliographical references and index Cationic polymerization of cyclic amines / E.J. Goethals, E.H. Schacht, P. Bruggeman, and P. Bossaer -- New aspects of the chemistry of living tetrahydrofuran polymers initiated by trifluoromethane sulfonic anhydride / Samuel Smith, William J.

Schultz, and Richard A. Newmark -- New developments in graft. The LibreTexts libraries are Powered by MindTouch ® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot.

We also acknowledge previous National Science Foundation support under grant numbers. Abstract:Some essential basics, mechanisms and properties in the chemistry of cyanine dyes are reviewed, explained and/or illustrated in the paper. This involves and/or covers the generic structure of cyanine dyes, mesomeric structures of cyanine dyes, charge of the dye unit, quaternary salts used in the preparation of cyanine dyes, mechanism.

Barbero and co-workers demonstrated allylation of acetals and ketals by using allyl trimethylsilane in the presence of 5 or 10 mol% of o-benzenedisulfonimide (BDSA) (12). 31 Solvent-free condition and reusability of catalyst are some of the characteristic features of this protocol.

The recovered BDSA was successfully used for three consecutive.A solid text covering some useful aspects of alicyclic chemistry; not comprehensive but some good examples. OCP 98 Davis and Fairbanks Carbohydrate Introduction - Obviously sheer class. Monosaccharides Collins and Ferrier A great book that is not too large but quite comprehensive – very well referenced and.Spiro compounds may be fully carbocyclic (all carbon) or heterocyclic (having one or more non-carbon atom).

One common type of spiro compound encountered in educational settings is a heterocyclic one— the acetal formed by reaction of a diol with a cyclic common atom that connects the two (or sometimes three) rings is called the spiro atom;: SP-0 in carbocyclic .