scholarly journals Polymers from sugars and CS2: ring opening copolymerisation of a ᴅ-xylose anhydrosugar oxetane

2021 ◽  
Author(s):  
Thomas McGuire ◽  
Antoine Buchard
Keyword(s):  
Ring Opening ◽  
High Head ◽  
Sugar Derivative

A ᴅ-xylose anhydro sugar derivative (1) has been applied in ring-opening copolymerisation (ROCOP) with CS2 to form a polythiocarbonate (poly(CS2-co-1)) with high head-head/tail-tail regioselectivity towards alternating thiono- and trithiocarbonate linkages...

Base induced ring opening of a sugar derivative O-carbamate

1995 ◽  
Vol 36 (16) ◽  
pp. 2761-2764 ◽  
Author(s):  
R. Tamion ◽  
F. Marsais ◽  
G. Queguiner
Keyword(s):  
Ring Opening ◽  
Sugar Derivative

Chemical synthesis of (1→3)-β-D-glucopyranan by ring-opening polymerization of a 1,3-anhydro sugar derivative

1991 ◽  
Vol 24 (25) ◽  
pp. 6797-6799 ◽  
Author(s):  
Masahiko Okada ◽  
Yoshitaka Yamakawa ◽  
Hiroshi Sumitomo
Keyword(s):  
Chemical Synthesis ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Sugar Derivative

ChemInform Abstract: Base-Induced Ring Opening of a Sugar Derivative O-Carbamate.

ChemInform ◽  
2010 ◽  
Vol 26 (32) ◽  
pp. no-no
Author(s):  
R. TAMION ◽  
F. MARSAIS ◽  
G. QUEGUINER
Keyword(s):  
Ring Opening ◽  
Sugar Derivative

Amino-functional polyethers: versatile, stimuli-responsive polymers

2020 ◽  
Vol 11 (24) ◽  
pp. 3940-3950 ◽  
Author(s):  
Patrick Verkoyen ◽  
Holger Frey
Keyword(s):  
Ring Opening ◽  
Review Article ◽  
Stimuli Responsive ◽  
New Class ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers

Amino-functional polyethers have emerged as a new class of “smart”, i.e. pH- and thermoresponsive materials. This review article summarizes the synthesis and applications of these materials, obtained from ring-opening of suitable epoxide monomers.

Reversible Oxidative-Addition and Reductive-Elimination of Thiophene from a Titanium Complex and Its Thermally-Induced Hydrodesulfurization Chemistry

2019 ◽  
Author(s):  
Alejandra Gomez-Torres ◽  
J. Rolando Aguilar-Calderón ◽  
Carlos Saucedo ◽  
Aldo Jordan ◽  
Alejandro J. Metta-Magaña ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Ring Opening ◽  
Thiophene Ring ◽  
Oxidative Addition ◽  
Reductive Elimination ◽  
Thermally Induced ◽  
Titanium Complex

<p>The masked Ti(II) synthon (<sup>Ket</sup>guan)(<i>η</i><sup>6</sup>-Im<sup>Dipp</sup>N)Ti (<b>1</b>) oxidatively adds across thiophene to give ring-opened (<sup>Ket</sup>guan)(Im<sup>Dipp</sup>N)Ti[<i>κ</i><sup>2</sup>-<i>S</i>(CH)<sub>3</sub><i>C</i>H] (<b>2</b>). Complex <b>2</b> is photosensitive, and upon exposure to light, reductively eliminates thiophene to regenerate <b>1</b> – a rare example of early-metal mediated oxidative-addition/reductive-elimination chemistry. DFT calculations indicate strong titanium π-backdonation to the thiophene π*-orbitals leads to the observed thiophene ring opening across titanium, while a proposed photoinduced LMCT promotes the reverse thiophene elimination from <b>2</b>. Finally, pressurizing solutions of <b>2 </b>with H<sub>2</sub> (150 psi) at 80 °C leads to the hydrodesulfurization of thiophene to give the Ti(IV) sulfide (<sup>Ket</sup>guan)(Im<sup>Dipp</sup>N)Ti(S) (<b>3</b>) and butane. </p>

Visible Light-Promoted Catalytic Ring-Opening Isomerization of 1,2-Disubstituted Cyclopropanols to Linear Ketones

2019 ◽  
Author(s):  
Marharyta V. Laktsevich-Iskryk ◽  
Nastassia A. Varabyeva ◽  
Volha V. Kazlova ◽  
Vladimir N. Zhabinskii ◽  
Vladimir A. Khripach ◽  
...  
Keyword(s):  
Visible Light ◽  
Functional Groups ◽  
Ring Opening ◽  
Radical Intermediates ◽  
Reaction Proceeds

In this article, we report a photocatalytic protocol for the isomerization of 1,2-disubstituted cyclopropanols to linear ketones. The reaction proceeds <i>via</i> radical intermediates and tolerates various functional groups.

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