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Search for "chalcogen" in Full Text gives 35 result(s) in Beilstein Journal of Organic Chemistry.

Correlation of surface pressure and hue of planarizable push–pull chromophores at the air/water interface

  • Frederik Neuhaus,
  • Fabio Zobi,
  • Gerald Brezesinski,
  • Marta Dal Molin,
  • Stefan Matile and
  • Andreas Zumbuehl

Beilstein J. Org. Chem. 2017, 13, 1099–1105, doi:10.3762/bjoc.13.109

Graphical Abstract
  • introduced. The structure of such a "flipper" probe is depicted in Figure 1 [6][7][8][9]. Without going into details, the two dithienothiophene flippers are twisted out of planarity by chalcogen bond repulsion between the methyl groups and the endocyclic sulfurs next to the mechanosensitive bond [9
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Published 08 Jun 2017

N-Propargylamines: versatile building blocks in the construction of thiazole cores

  • S. Arshadi,
  • E. Vessally,
  • L. Edjlali,
  • R. Hosseinzadeh-Khanmiri and
  • E. Ghorbani-Kalhor

Beilstein J. Org. Chem. 2017, 13, 625–638, doi:10.3762/bjoc.13.61

Graphical Abstract
  • -2-ylamides 54 in good yields (Scheme 16a). The mechanism for this cyclization as proposed by the authors is depicted in Scheme 16b [98]. Following this work, the Čikotienė group studied the metal-free halogen, chalcogen, or oxocarbenium ion-mediated cyclization of a series of N-propargylthioureas 55
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Published 30 Mar 2017

Nucleophilic displacement reactions of 5′-derivatised nucleosides in a vibration ball mill

  • Olga Eguaogie,
  • Patrick F. Conlon,
  • Francesco Ravalico,
  • Jamie S. T. Sweet,
  • Thomas B. Elder,
  • Louis P. Conway,
  • Marc E. Lennon,
  • David R. W. Hodgson and
  • Joseph S. Vyle

Beilstein J. Org. Chem. 2017, 13, 87–92, doi:10.3762/bjoc.13.11

Graphical Abstract
  • corresponding 5′-selenocyanates in variable yields over the course of between one and eleven hours thereby avoiding the preparation and use of hygroscopic tetrabutylammonium salts. Keywords: ball mill; chalcogen; mechanochemistry; nucleophilic substitution; nucleoside; Introduction Nucleophilic displacement
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Published 13 Jan 2017

O-Alkylated heavy atom carbohydrate probes for protein X-ray crystallography: Studies towards the synthesis of methyl 2-O-methyl-L-selenofucopyranoside

  • Roman Sommer,
  • Dirk Hauck,
  • Annabelle Varrot,
  • Anne Imberty,
  • Markus Künzler and
  • Alexander Titz

Beilstein J. Org. Chem. 2016, 12, 2828–2833, doi:10.3762/bjoc.12.282

Graphical Abstract
  • activated due to their enhanced reactivity in the presence of other chalcogen-containing glycosides such as O- or S-glycosides. By exploiting these properties, one-pot multi-step glycosylation reactions have been developed recently [10][11]. Natural selenosugars, such as methylseleno N-acetyl-β-D
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Published 22 Dec 2016

Star-shaped tetrathiafulvalene oligomers towards the construction of conducting supramolecular assembly

  • Masahiko Iyoda and
  • Masashi Hasegawa

Beilstein J. Org. Chem. 2015, 11, 1596–1613, doi:10.3762/bjoc.11.175

Graphical Abstract
  • doping of 15a with iodine and bromine vapors afforded black conducting complexes (σrt = 1.1 × 10−4 and 1.5 × 10−4 S cm−1, respectively). For conjugated TTF dimers linked by π-systems or chalcogen atoms, intramolecular through-bond and/or through-space interactions can be expected between two TTF parts
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Published 10 Sep 2015

Synthesis and characterization of the cyanobenzene-ethylenedithio-TTF donor

  • Sandrina Oliveira,
  • Dulce Belo,
  • Isabel C. Santos,
  • Sandra Rabaça and
  • Manuel Almeida

Beilstein J. Org. Chem. 2015, 11, 951–956, doi:10.3762/bjoc.11.106

Graphical Abstract
  • between planar molecules that tend to be organized in the solid state as stacks or layers with their long axis parallel to each other. Second, the incorporation of additional sulfur and other chalcogen atoms in the molecular periphery to promote side intermolecular interactions along the molecular plane
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Published 03 Jun 2015

Homolytic substitution at phosphorus for C–P bond formation in organic synthesis

  • Hideki Yorimitsu

Beilstein J. Org. Chem. 2013, 9, 1269–1277, doi:10.3762/bjoc.9.143

Graphical Abstract
  • position since they provide transformations unattainable by polar reactions. Homolytic substitution is a reaction in which a radical (R•) attacks a saturated atom (X) in a molecule with the liberation of a leaving radical (L•) from the atom (Scheme 2). Homolytic substitution at halogen and chalcogen atoms
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Published 28 Jun 2013

Asymmetric synthesis of tertiary thiols and thioethers

  • Jonathan Clayden and
  • Paul MacLellan

Beilstein J. Org. Chem. 2011, 7, 582–595, doi:10.3762/bjoc.7.68

Graphical Abstract
  • greater steric bulk in the chalcogen substituent. 2.2.2 Lithiation and alkylation of thiocarbamates Hoppe and co-workers applied the observations of Hoffmann and Reich in comprehensive studies on configurationally stable α-lithiothiocarbamates. Stereoselective deprotonations of thiocarbamate 73 in the
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Published 10 May 2011

The allylic chalcogen effect in olefin metathesis

  • Yuya A. Lin and
  • Benjamin G. Davis

Beilstein J. Org. Chem. 2010, 6, 1219–1228, doi:10.3762/bjoc.6.140

Graphical Abstract
  • chalcogen effect in protein modifications via olefin metathesis and the associated principles of cross-metathesis (CM) partner selection for reliable and efficient reaction on proteins are also highlighted. The effect of allylic hydroxy groups in olefin metathesis The activating effect of allylic hydroxy
  • favorable than the sulfur in allyl sulfides. While, as a single example, Kotetsu and co-workers have synthesized selenium-containing bicyclic β-lactams via RCM of an allyl selenide derivative, enhanced reactivity was unnoticed [39]. With a better understanding of the allylic chalcogen effect, olefin
  • chalcogen effect has affected the way chemists use metathesis in synthesis and chemical biology. Complex molecules and metathesis partners can be joined efficiently with the aid of the natural affinity of ruthenium for allyl chalcogens. In this review, we have highlighted various applications of olefin
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Published 23 Dec 2010

Redox-active tetrathiafulvalene and dithiolene compounds derived from allylic 1,4-diol rearrangement products of disubstituted 1,3-dithiole derivatives

  • Filipe Vilela,
  • Peter J. Skabara,
  • Christopher R. Mason,
  • Thomas D. J. Westgate,
  • Asun Luquin,
  • Simon J. Coles and
  • Michael B. Hursthouse

Beilstein J. Org. Chem. 2010, 6, 1002–1014, doi:10.3762/bjoc.6.113

Graphical Abstract
  • ultimately lead to orbital overlap in one dimension, albeit through a combination of chalcogenchalcogen and π–π contacts. The UV–visible electronic absorption spectra of compounds 3, 25, 27 and 28 were recorded in CH2Cl2 solution and are shown in Figure 6. The spectra of thione 3 and ethylenedithio-bridged
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Published 21 Oct 2010
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