scholarly journals Grignard coupling-based synthesis of vinyl-substituted hydridopolycarbosilane: effect of starting material and polymerization behavior

RSC Advances ◽  
2021 ◽  
Vol 11 (19) ◽  
pp. 11771-11778
Author(s):  
Minji Jeong ◽  
Moon-Gun Choi ◽  
Yoonjoo Lee
Keyword(s):  
Coupling Reaction ◽  
Starting Material ◽  
Polymerization Behavior

Polymerization of VHPCS by the Grignard coupling reaction depended on the type of starting material. In the case of Cl3SiCH2Cl starting material, a stepwise growth manner was shown, due to a coupling between –CH2Cl and the Si–Cl sites.

The Preparation of 1,2-Bis(2,2′:6′,2′′-Terpyridin-4′yl)Ethanone: The First Example of 4′-Terpyridyls Unsymmetrically Linked by a Functionalized Two-Carbon Chain

2004 ◽  
Vol 57 (7) ◽  
pp. 689 ◽  
Author(s):  
Zhi-Long Chen ◽  
Ronald N. Warrener ◽  
Douglas N. Butler
Keyword(s):  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Single Crystal ◽  
Coupling Reaction ◽  
Carbon Chain ◽  
Sodium Cyanide ◽  
Starting Material ◽  
X Ray ◽  
Concentrated Sulfuric Acid ◽  
Single Crystal Analysis

1,2-Bis(2,2′:6′,2′′-terpyridin-4′yl)ethanone 7, an unsymmetrically linked bis-tridentatate ligand, was prepared by treatment of 4′-cyanomethylterpyridine 10 (RT, overnight) or 4′-(methoxycarbonylmethyl)terpyridine 11 (60°C, 7 h) with concentrated hydrochloric acid. These conversions, which involved an unprecedented homo-coupling reaction, are discussed with the structure of 7 being confirmed by X-ray single crystal analysis. The nitrile starting material 10 was prepared by reaction of the mesylate 9, derived from the known 4′-hydroxymethylterpyridine 8 with sodium cyanide, while ester 11 was prepared by reaction of 10 with methanol in the presence of concentrated sulfuric acid.

Calcium carbide as a cost-effective starting material for symmetrical diarylethynes via Pd-catalyzed coupling reaction

Tetrahedron ◽  
2011 ◽  
Vol 67 (42) ◽  
pp. 8177-8182 ◽  
Author(s):  
Padon Chuentragool ◽  
Kunnigar Vongnam ◽  
Paitoon Rashatasakhon ◽  
Mongkol Sukwattanasinitt ◽  
Sumrit Wacharasindhu
Keyword(s):  
Coupling Reaction ◽  
Calcium Carbide ◽  
Cost Effective ◽  
Starting Material

Synthesis of 6-alkynylated uridines

1986 ◽  
Vol 64 (8) ◽  
pp. 1560-1563 ◽  
Author(s):  
Hiromichi Tanaka ◽  
Kazuhiro Haraguchi ◽  
Yachiyo Koizumi ◽  
Mariko Fukui ◽  
Tadashi Miyasaka
Keyword(s):  
Coupling Reaction ◽  
Starting Material ◽  
Terminal Alkynes

6-Alkynylated uridines, a hitherto unknown class of compounds, were synthesized by a coupling reaction of terminal alkynes with 6-iodo-2′,3′-O-isopropylidene-5′-O-methoxymethyluridine in the presence of bis(triphenylphosphine)palladium(II) chloride and copper(I) iodide. 6-Ethynyl-2′-deoxyuridine was also prepared by using 6-iodo-3′,5′-O-(tetraisopropyldisiloxan-1,3-diyl)-2′-deoxyuridine as a starting material.

scholarly journals A chiral “Siamese-Twin” calix[4]pyrrole tetramer

2016 ◽  
Vol 7 (9) ◽  
pp. 5976-5982 ◽  
Author(s):  
Albano Galán ◽  
Gemma Aragay ◽  
Pablo Ballester
Keyword(s):  
Coupling Reaction ◽  
Starting Material ◽  
Reaction Conditions ◽  
Siamese Twin

We describe our results in the attempted template syntheses of oligomacrocycle calix[4]pyrrole dimer 4, using Hay coupling reaction conditions, tetraalkynyl calix[4]pyrrole 5 as starting material and two bipyridyl N-oxides of different length as templates.

ChemInform Abstract: Calcium Carbide as a Cost-Effective Starting Material for Symmetrical Diarylethynes via Pd-Catalyzed Coupling Reaction.

ChemInform ◽  
2012 ◽  
Vol 43 (9) ◽  
pp. no-no
Author(s):  
Padon Chuentragool ◽  
Kunnigar Vongnam ◽  
Paitoon Rashatasakhon ◽  
Mongkol Sukwattanasinitt ◽  
Sumrit Wacharasindhu
Keyword(s):  
Coupling Reaction ◽  
Calcium Carbide ◽  
Cost Effective ◽  
Starting Material

scholarly journals Synthesis of the heterocyclic core of the D-series GE2270

2017 ◽  
Vol 13 ◽  
pp. 1407-1412 ◽  
Author(s):  
Christophe Berini ◽  
Thibaut Martin ◽  
Pierrik Lassalas ◽  
Francis Marsais ◽  
Christine Baudequin ◽  
...  
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Starting Material ◽  
Enantiomerically Pure ◽  
Synthetic Strategy ◽  
Cross Coupling Reaction

A straightforward enantiomerically pure synthesis of the heterocyclic core of the D-series GE2270 is reported. The synthetic strategy combines the Hantzsch thiazole’s building condensation with a cross-coupling reaction including direct C–H hetarylation to build and connect step-by-step thiazolyl moieties to the 5-bromopicolinate as readily available starting material.

Simultaneous Spectrophotometric Determination of Salbutamol by Coupling with Diazotized 4-Aminobenzoic acid

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Hind Hadi ◽  
Gufran Salim
Keyword(s):  
Pharmaceutical Preparations ◽  
Coupling Reaction ◽  
Dosage Forms ◽  
Water Soluble ◽  
Trace Determination ◽  
Aminobenzoic Acid ◽  
Optimum Conditions ◽  
Colored Product ◽  
Versus Concentration

A simple, rapid and sensitive spectrophotmetric method for trace determination of salbutamol (SAL) in aqueous solution and in pharmaceutical preparations is described. The method is based on the diazotization coupling reaction of the intended compound with 4-amino benzoic acid (ABA) in alkaline medium to form an intense orange, water soluble dye that is stable and shows maximum absorption at 410 nm. A graph of absorbance versus concentration indicates that Beer’s law is obeyed over the concentration range of 0.5-30 ppm, with a molar absorbtivity 3.76×104 L.mol-1 .cm-1 depending on the concentration of SAL. The optimum conditions and stability of the colored product have been investigated and the method was applied successfully to the determination of SAL in dosage forms.

Ferromagnetic Chain Based on Verdazyl-Nitroxide Diradical

2020 ◽  
Author(s):  
Evgeny Tretyakov ◽  
Svetlana Zhivetyeva ◽  
Pavel Petunin ◽  
Dmitry Gorbunov ◽  
Nina Gritsan ◽  
...  
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Ferromagnetic Coupling ◽  
Nitronyl Nitroxide ◽  
Triplet Ground State ◽  
One Dimensional ◽  
Cross Coupling Reaction ◽  
Palladium Catalyzed ◽  
Ferromagnetic Chain ◽  
High Yields

<p>Verdazyl-nitroxide diradicals were synthesized using the palladium-catalyzed cross-coupling reaction of the corresponding iodoverdazyls with a nitronyl nitroxide-2-ide gold(I) complex with high yields (up to 82%). The synthesized diradicals were found to be highly thermally stable and have a singlet (D<i>E</i><sub>ST</sub> » -64 cm<sup>–1</sup>) or triplet ground state (D<i>E</i><sub>ST</sub> ³ 25 and 100 cm<sup>–1</sup>), depending on which canonical hydrocarbon diradical type they belong to. Upon crystallization, triplet diradicals form unique one-dimensional (1D) spin <i>S</i> = 1 chains of organic diradicals with intrachain ferromagnetic coupling of <i>J</i>′/<i>k</i><sub>B</sub> from 3 to 6 K.</p>

An Iron-Based Catalyst Enables The Enantioconvergent Synthesis of Chiral 1,1-Diarylalkanes Through a Suzuki-Miyaura Cross-Coupling Reaction

2020 ◽  
Author(s):  
Chet Tyrol ◽  
Nang Yone ◽  
Connor Gallin ◽  
Jeffery Byers
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Radical Intermediates ◽  
Cross Coupling Reactions ◽  
Cross Coupling Reaction ◽  
Boronic Esters ◽  
Carbon Centered Radical ◽  
Iron Based ◽  
High Yields

By using an iron-based catalyst, access to enantioenriched 1,1-diarylakanes was enabled through an enantioselective Suzuki-Miyaura crosscoupling reaction. The combination of a chiral cyanobis(oxazoline) ligand framework and 1,3,5-trimethoxybenzene additive were essential to afford high yields and enantioselectivities in cross-coupling reactions between unactivated aryl boronic esters and a variety of benzylic chlorides, including challenging ortho-substituted benzylic chloride substrates. Mechanistic investigations implicate a stereoconvergent pathway involving carbon-centered radical intermediates.

Sign in / Sign up

Export Citation Format

Share Document