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Saturday, July 25, 2020 | History

2 edition of Intra- and intermolecular group migrations in disubstituted benzenes. found in the catalog.

Intra- and intermolecular group migrations in disubstituted benzenes.

Pieter Johannis de Valois

Intra- and intermolecular group migrations in disubstituted benzenes.

by Pieter Johannis de Valois

  • 53 Want to read
  • 9 Currently reading

Published by [Goudsesingel 260] Bronder-Offset in Rotterdam .
Written in English

    Subjects:
  • Toluene.,
  • Isomerization.

  • Classifications
    LC ClassificationsQD341.H9 V23
    The Physical Object
    Pagination100 p.
    Number of Pages100
    ID Numbers
    Open LibraryOL5159675M
    LC Control Number74477013

    Intra- and intermolecular C-H activation by bis aspects of homogeneously-catalyzed hydrocarbon oxidation with platinum and palladium complexes Acs National Meeting Book of Abstracts. 1: Investigations of their equilibration with thiolates and the stereochemistry of alkyl migrations from sulfur to tantalum Organometallics. 11 ?pid= D. Xiang, X. Bi,* P. Liao, Z. Wang, X. Xin, D, Dong,* Solvent-Controlled, Regio-Switchable Formation of 3-Arylamino- or 5-Arylaminopyrazole Isomer in The Cyclocondensation of b-Aminoenones with Hydrazides: Intermolecular Hydrogen Bonding Plays The Role,

    The keto group is a strong H-bond acceptor site, still the first maximum of the pedf is presumably assignable to the C(carboxylic)=O H (water) intermolecular H-bonds. There are interaction energies for the anti acetic acid in the same range, where no competing C=O group exists for this simple :// 3-Aminomethylation of salicylalkylamides afforded hybrids with a Mannich base. In addition, it triggered the rotation of the amide bond. The observed conformational switch is driven by strong intramolecular hydrogen bonding between the Mannich base and phenolic group. Crystal structure analysis reveals the stabilization of the hybrid molecules by double hydrogen bonding of the phenolic OH

    1. Introduction. The Buchner reaction of metal carbenes generated from diazocarboxylates and related substrates has been observed under catalytic or stoichiometric conditions using copper(I), 1−3 silver(I), 4,5 gold(I), 3,6 rhodium(II), 7 and ruthenium complexes. 8 Chloro(tetraphenylporphyrinato)iron has also been reported as a catalyst for the Buchner reaction. 9 The copper- and rhodium However, with some substrates the ring closing produced a significant amount of isomers resulting from 1,5 or 1,4 migrations of palladium. In order to improve the yields into the desired PAHs B and E, the authors performed the reaction from G and H, with which the potential rearrangements were ://(19)?rss=yes.


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Intra- and intermolecular group migrations in disubstituted benzenes by Pieter Johannis de Valois Download PDF EPUB FB2

(Theochem) () ] is applied now for interpretation of the electron density distribution in disubstituted benzenes containing an electron-donating substituent (D) and an electron In book: The Hydroxyl Group (), pp - The capacity of the o-isomers of disubstituted benzenes containing two electronegative (or dipolar) substituents to form chelates with A1 Good migrations: The highly regioselective migration of a sulfonyl group for the synthesis of functionalized pyrroles is reported (see scheme; DMF=N,N ‐dimethylformamide).The migration of the sulfonyl group to different positions can be controlled with high selectivity, thus allowing the formation of Intra- and intermolecular group migrations in disubstituted benzenes.

book α‐ and β‐(arylsulfonyl)methyl pyrroles with high :// Intra- vs Intermolecular Photoinduced Electron Transfer Reactions of a Macrocyclic Donor−Acceptor Dyad Article in The Journal of Physical Chemistry A (51) January with 94 Reads Chalcogen bonding is a type of noncovalent interaction in which a covalently bonded chalcogen atom (O, S, Se or Te) acts as an electrophilic species towards a nucleophilic (negative) region(s) in another or in the same molecule.

In general, this interaction is strengthened by the presence of an electron-with 1st International Conference on Noncovalent Interactions Frontier and Perspective Trimethylsilyl Group Migrations in Cryogenic Ozonolysis of Trimethylsilylethene: Evidence for Nonconcerted Primary Ozonide Decomposition Pathway The Preparation and Intra- and Intermolecular Addition Reactions of Acyclic N-Acylimines: Application to the Synthesis of (±) Sterically Hindered C α, α-Disubstituted α-Amino Acids Exploiting the analogy with hydrogen and halogen bonds, the chalcogen bond is comparatively a new type of weak noncovalent interaction, which can be used by organic tectons to control the secondary coordination sphere of metal ions.

29,63–68 As for other types of noncovalent interactions, chalcogen bonding can be intra- and intermolecular, in Only N-unsubstituted pyrazoles react, thus no 1,2-disubstituted quaternary salts can be obtained in that way.

(2) Only activated halogenated benzenes react (p-fluoronitrobenzene, 1-fluoro-2,4-dinitrobenzene, picryl chloride). 3,6-Dichloropyridazine reacts with two moles of pyrazole to yield (), an excellent chelating agent 〈70BSF〉. Journal or Book Year; Mild and General Cross-Coupling of (α-Alkoxyvinyl)silanols and -silyl Hydrides Oxygen NMR spectroscopy: evaluation of intra- and intermolecular hydrogen bonding of phenols to carbonyl groups A carbon CP/MAS nuclear magnetic resonance study of several 1,4-disubstituted benzenes in the solid state Intermolecular benzyne–enolate cycloadditions have been studied in detail by Caubere et al.

99 Benzocyclobutenols () were obtained with enolates derived from five- six- and seven-membered ring ketones. Larger ring enolates and acyclic enolates results in ring expanded ketones and o-disubstituted :// Charge-Assisted Intramolecular Hydrogen Bonds in Disubstituted Cyclohexane Derivatives the lone-pairs of the electron donor group and the antibonding orbitals of the acceptor group represents Allenes.

Allenes have been largely employed, either in an intermolecular version or for the synthesis of a variety of rings by an intramolecular process. JA>. From: Comprehensive Organic Functional Group Transformations II, Related terms: Interference and Molecular Transport-A Dynamical View: Time-Dependent Analysis of Disubstituted Benzenes Article in Journal of Physical Chemistry Letters 5(15) August with 88 Reads Xing-Zhong Shu, Xiaoxun Li, Dongxu Shu, Suyu Huang, Casi M.

Schienebeck, Xin Zhou, Patrick J. Robichaux and Weiping Tang, Rhodium-Catalyzed Intra- and Intermolecular [5 + 2] Cycloaddition of 3-Acyloxy-1,4-enyne and Alkyne with Concomitant 1,2-Acyloxy Migration, Journal of the American Chemical Society, /ja,11, ( The carbon–carbon double bond in olefins serves as a precursor to a rich array of transformations and is a cornerstone in the materials, pharmaceutical, agrochemical arenas, and food industry (1, 2).Its construction in a selective and stereochemically defined manner—i.e., E versus Z olefin—is of utmost importance, as the geometry is ultimately coupled to :// With some crossover of application between the studies, Wetzel and Gagoszs report mainly focused on intermolecular trapping of the α‐imino gold carbene 32 (Scheme 11).

The reaction of an allylic alcohol is followed by Claisen rearrangement of the initial adduct to give 2,2‐disubstituted indolin‐3‐o a motif found in a number of   This report describes the first enantioselective cross-couplings of racemic secondary benzylic halides, specifically, nickel-catalyzed Negishi reactions of bromides and chlorides.

The catalyst components are commercially available and air-stable, and the reaction is not highly oxygen- or moisture-sensitive (it can be set up in the air). The method has been applied to the catalytic   The authors examined the utility of their catalysts in the reduction of 1,3-disubstituted-1,4-cyclohexadiene substrates (i.e., the Birch reduction products of 1,3-disubstituted benzenes) using mol% of precatalyst in dichloromethane at ambient temperature under 50 bar H ://   Gold-Catalyzed Formation of Oxonium Ions from Enynes and Their Intra- and Intermolecular Trapping with Allylsilanes.

Organic Letters14 (1), DOI: /olk. Huaiji Zheng, Xing Huo, Changgui Zhao, Peng Jing, Juan Yang, Bowen Fang, and Xuegong :// The González group developed an intermolecular reaction of internal alkynes and imines, in which the propargyl tosylates react with N-tosylaldimines to afford cyclopentenimines The final product was achieved through a 1,2-migration of the tosylate followed by the interaction with the imine and a Nazarov-like ://.

In disubstituted benzenes, there are four C H stretching vibrations whose wavenumber fall in the region – cm −1.

Observation of bands at cm −1 (IR) and cm −1 (Raman) are attributed to C H stretching vibrations of phenyl ring and are assigned to the 20b ://  The carbene-like character of the intermediates formed in metal-catalyzed cycloisomerizations is more clearly manifested in intra- and intermolecular cyclopropanation of alkenes.

(2, 7, 73) Thus, reaction of dienynes 13p and 13q with gold(I) leads stereoselectively to tetracyclic compounds 40a and 40b (Scheme 10). The supplemental website to Steven Bachrach's book Computational Organic Chemistry Bickelhaupt, F. M. "Nucleophilicity and Leaving-Group Ability in Frontside and Backside Stereochemical Evidence for the Involvement of Only One Proline Molecule in the Transition States of Proline-Catalyzed Intra- and Intermolecular Aldol Reactions," J