High-yield production of highly conductive graphene via reversible covalent chemistry

2015 ◽  
Vol 51 (14) ◽  
pp. 2806-2809 ◽  
Author(s):  
Zhe Ji ◽  
Ji Chen ◽  
Liang Huang ◽  
Gaoquan Shi
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
High Yield ◽  
High Quality ◽  
Layer Graphene ◽  
Diels Alder Reaction ◽  
Yield Production ◽  
Reversible Covalent ◽  
Few Layer Graphene ◽  
High Yield Production

A reversible covalent strategy based on the Diels–Alder reaction of graphite and tetracyanoethylene has been developed for the high-yield production of high-quality few-layer graphene.

scholarly journals High yield production and purification of few layer graphene by Gum Arabic assisted physical sonication

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Victor Chabot ◽  
Brian Kim ◽  
Brent Sloper ◽  
Costas Tzoganakis ◽  
Aiping Yu
Keyword(s):  
Gum Arabic ◽  
High Yield ◽  
Layer Graphene ◽  
Yield Production ◽  
Few Layer Graphene ◽  
High Yield Production

Simple, green and high-yield production of single- or few-layer graphene by hydrothermal exfoliation of graphite

Nanoscale ◽  
2014 ◽  
Vol 6 (9) ◽  
pp. 4598-4603 ◽  
Author(s):  
Xiangrong Liu ◽  
Mingtao Zheng ◽  
Ke Xiao ◽  
Yong Xiao ◽  
Chenglong He ◽  
...  
Keyword(s):  
High Yield ◽  
Layer Graphene ◽  
Yield Production ◽  
Few Layer Graphene ◽  
High Yield Production

Schematic illustration of hydrothermal exfoliation graphite to produce graphene with intercalant and stabilizer under hydrothermal stirring conditions.

New Chain Extenders for Self-Healing Polymers

2021 ◽  
Vol 899 ◽  
pp. 628-637
Author(s):  
Daria V. Zakharova ◽  
Zalina A. Lok’yaeva ◽  
Alexander A. Pavlov ◽  
Alexander V. Polezhaev
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Hydroxyl Groups ◽  
Structural Fragment ◽  
Self Healing ◽  
Diels Alder Reaction ◽  
Small Series ◽  
Chain Extenders ◽  
Reversible Covalent ◽  
Thermochemical Parameters

We present here a small series of compounds designed to modify the polymer chain of various polyurethanes in order to introduce a structural fragment with the ability of thermally-triggered reversible covalent interactions. Bismaleimides (2a-2e) were synthesized from commercially available aromatic and aliphatic symmetric diamines (1a-1e) and were further introduced into the Diels-Alder reaction with furfuryl alcohol as dienophiles. The Diels-Alder adducts (3a-3e) were obtained as a mixture of endo- and exo-isomer. The presence of symmetrical hydroxyl groups in the structure of the obtained compounds makes them suitable as chain extenders of low molecular weight diisocyanate prepolymers. The presence of a thermally reversible Diels-Alder reaction adduct in the structure of potential chain-extenders opens a possibility to create unique materials with self-healing properties. All compounds obtained were characterized by 1H, 13C NMR, ESI-HRMS, and IR spectroscopy. The thermochemical parameters of the reverse Diels-Alder reaction were established using DSC analysis.

Reversible Covalent Assembly of Nanoparticles through On-Surface Diels–Alder Reaction

Langmuir ◽  
2020 ◽  
Vol 36 (6) ◽  
pp. 1552-1558 ◽  
Author(s):  
Markus B. Schütz ◽  
Khan Lê ◽  
Shaista Ilyas ◽  
Sanjay Mathur
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction ◽  
Reversible Covalent

Dielectric environment as a factor to enhance the production yield of solvent exfoliated graphene

RSC Advances ◽  
2015 ◽  
Vol 5 (79) ◽  
pp. 64395-64403 ◽  
Author(s):  
Pawan Kumar Srivastava ◽  
Premlata Yadav ◽  
Subhasis Ghosh
Keyword(s):  
Energy Storage ◽  
Production Yield ◽  
High Yield ◽  
Energy Storage Devices ◽  
High Quality ◽  
Storage Devices ◽  
Exfoliated Graphene ◽  
Yield Production ◽  
High Yield Production ◽  
Dielectric Environment

High yield production of high quality graphene is essential for its application in electronics, optoelectronics and energy storage devices.

scholarly journals High-yield production of 2D crystals by wet-jet milling

2018 ◽  
Vol 5 (5) ◽  
pp. 890-904 ◽  
Author(s):  
A. E. Del Rio Castillo ◽  
V. Pellegrini ◽  
A. Ansaldo ◽  
F. Ricciardella ◽  
H. Sun ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Large Scale ◽  
High Yield ◽  
High Quality ◽  
Yield Production ◽  
Layered Crystals ◽  
Liquid Phase Exfoliation ◽  
Jet Milling ◽  
2D Crystals ◽  
High Yield Production

A novel liquid-phase exfoliation of layered crystals enables the production of defect-free and high quality 2D-crystal dispersions on a large scale.

1-Bromo-1,2-dicyanoethylene: A dicyanoacetylene synthon useful in tetraazaporphyrin synthesis

2019 ◽  
Vol 23 (10) ◽  
pp. 1092-1099
Author(s):  
Jeffrey P. Fitzgerald ◽  
John P. Korenak ◽  
Delano A. Steinaker ◽  
Logan M. Swogger ◽  
Jessica A. Lois
Keyword(s):  
Vacuum Distillation ◽  
Alder Reaction ◽  
Diels Alder ◽  
High Yield ◽  
Geometric Isomers ◽  
Diels Alder Reaction ◽  
Made In

Dicyanoacetylene, a highly reactive dienophile, readily reacts to form substituted maleonitriles which serve as precursors to soluble tetraazaporphyrins. Unfortunately, dicyanoacetylene is difficult to synthesize in large quantities. We report here a new dicyanoacetylene synthon, 1-bromo-1,2-dicyanoethylene, which is easily made in high yield by reaction of elemental bromine with fumaronitrile and easily purified by vacuum distillation. The resulting 5:1 mixture of geometric isomers reacts with dienes via a Diels–Alder reaction followed by elimination of HBr to give substituted maleonitriles. We demonstrate the utility of these reactions by reporting the synthesis of a novel, soluble tetraazaporphyrin bearing four 1,4-fused cyclohexyl groups on the macrocycle periphery.

π-Facial diastereoselectivity in the Diels–Alder reactions of cis-cyclohexa-3,5-diene-1,2-diol and derivatives with N-phenylmaleimide

1992 ◽  
Vol 70 (5) ◽  
pp. 1296-1307 ◽  
Author(s):  
James R. Gillard ◽  
D. Jean Burnell
Keyword(s):  
Trimethylsilyl Ether ◽  
Addition Product ◽  
Diels Alder ◽  
High Yield ◽  
Ether Derivative ◽  
Yield Production ◽  
The Face ◽  
High Yield Production

N-Phenylmaleimide undergoes Diels–Alder cycloaddition predominantly to the face of cis-cyclohexa-3,5-diene-1,2-diol (3) syn to the oxygen functions. Derivatization can be used to alter the π-facial diastereoselectivity in a synthetically useful manner. The best cases are the exclusive, high yield, production of the syn-addition product with the trimethylsilyl ether derivative (8), and the exo-benzylidine derivative (26) gave a 96:4 anti/syn ratio of adducts.

scholarly journals Synthesis of Hypericin via Emodin Anthrone Derived from a Two-fold Diels-Alder Reaction of 1,4-Benzoquinone

2007 ◽  
Vol 2 (1) ◽  
pp. 1934578X0700200 ◽  
Author(s):  
Jiro Motoyoshiya ◽  
Yusuke Masue ◽  
Yoshinori Nishi ◽  
Hiromu Aoyama
Keyword(s):  
Acid Hydrolysis ◽  
Alder Reaction ◽  
Diels Alder ◽  
High Yield ◽  
Oxidative Dimerization ◽  
Acidic Media ◽  
Diels Alder Reaction ◽  
Emodin Anthrone ◽  
Chloride Hydrate

The six-step synthesis of hypericin by the regioselective two-fold Diels-Alder reaction of 1,4-benzoquinone first with (1-methoxy-3-methylbuta-1,3-dienyloxy)trimethylsilane leading to 7-methyljuglone, and next with (1,3-dimethoxybuta-1,3-dienyloxy)trimethylsilane, to give emodin and its O-methylated derivative. The reduction of both compounds with tin(II) chloride in acidic media was accompanied by acid hydrolysis that produced emodin anthrone, whose oxidative dimerization with iron (III) chloride hydrate gave the bianthrone in high yield. The oxidation of the bianthrone in the presence of N-ethyldiisopropylamine gave protohypericin, which was converted into hypericin upon irradiation.

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