Covalent modification of graphite oxide with acetic anhydride to enhance dispersibility in organic solvents

2016 ◽  
Vol 09 (03) ◽  
pp. 1650044 ◽  
Author(s):  
Jingjing Li ◽  
Anwei Yang ◽  
Chen Zhang ◽  
Lei Zhang ◽  
Feifei Sun ◽  
...  
Keyword(s):  
Acetic Anhydride ◽  
Organic Solvents ◽  
Mild Condition ◽  
Graphite Oxide ◽  
Ring Opening ◽  
Covalent Modification ◽  
Alkyl Aryl ◽  
Aryl Chlorides ◽  
Ring Opening Reaction ◽  
Epoxy Groups

Graphite oxide (GO) was modified by acetic anhydride via a catalyzed ring-opening reaction of the attached epoxy groups at very mild condition. The dispersion of the modified GO is thus largely imporved in many organic solvents and the highest GO concentration reaches 2.0[Formula: see text]mg/mL in alkyl(aryl) chlorides, ethers, alcohols and cyclohexane, which is amongst the highest value for GO in organics.

Foam Structure of Xerogel Prepared Via Ring-Opening Reaction Between Epoxy Groups Attached on the Side Chain of Polystyrene

2007 ◽  
Vol 51 (4) ◽  
pp. 665-672 ◽  
Author(s):  
Kentaro Yamanaka ◽  
Keiji Nagai ◽  
Nobukatsu Nemoto ◽  
Kaori Nomura ◽  
Tomonori Shimoyama ◽  
...  
Keyword(s):  
Ring Opening ◽  
Side Chain ◽  
Foam Structure ◽  
Ring Opening Reaction ◽  
Epoxy Groups

Unexpected Ring-Opening Reaction of Aziridine with Acetic Anhydride in DMF.

ChemInform ◽  
2007 ◽  
Vol 38 (40) ◽  
Author(s):  
Tianning Diao ◽  
Xiaoyu Sun ◽  
Renhua Fan ◽  
Jie Wu
Keyword(s):  
Acetic Anhydride ◽  
Ring Opening ◽  
Ring Opening Reaction

scholarly journals Synthesis of New 5-Trifluoromethyl-3-alkyl[aryl(heteroaryl)]-4- (2-benzyl-3-hydroxycyclohex-2-enone-2-yl)-1H-pyrazoles by a Ring-Opening Reaction

2013 ◽  
Author(s):  
Jussara Navarini ◽  
Helio G. Bonacorso ◽  
Carson W. Wiethan ◽  
Rosália Andrighetto ◽  
Fábio M. Luz ◽  
...  
Keyword(s):  
Ring Opening ◽  
Alkyl Aryl ◽  
Ring Opening Reaction

A Novel Synthesis of 3-Bromo-1,2-Propanediol from 3-Oxetanol

2013 ◽  
Vol 848 ◽  
pp. 219-222
Author(s):  
Jian Sun ◽  
Shan Shan Gong ◽  
Qi Sun
Keyword(s):  
Mild Condition ◽  
Ring Opening ◽  
Experimental Results ◽  
Carbon Tetrabromide ◽  
Reaction Condition ◽  
Novel Synthesis ◽  
Ring Opening Reaction ◽  
Efficient Route ◽  
Bromination Reaction

Treatment of 3-oxetanol with carbon tetrabromide (CBr4) and triphenylphosphine (PPh3) under mild condition provides an efficient route for synthesis of 3-bromo-1,2-propanediol. The experimental results showed that an unexpected ring-opening reaction was selectively achieved under the routine bromination reaction condition.

Synthesis and Characterization of Palm Oil Based Polyol

2013 ◽  
Vol 812 ◽  
pp. 275-280
Author(s):  
Yahaya Siti Munira ◽  
Ahmad Faiza Mohd ◽  
Mohamed Rahmah
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Palm Oil ◽  
Ring Opening ◽  
Hydroxyl Group ◽  
Synthesis And Characterization ◽  
Epoxidized Palm Oil ◽  
Ring Opening Reaction ◽  
Epoxy Groups

In this study, palm oil-based polyols were prepared and characterized. In order to prepare the polyol, Epoxidized palm oil (EPO) was reacted with glycerol and undergoes ring opening reaction. The synthesized oil was characterized by oxygen oxirane content titration (OOC), hydroxyl value test (HV), fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR). Based on the FTIR spectrum of polyols, the disappearance of epoxy groups at 825cm-1, 843cm-1 and the emergence of hydroxyl group at 3394cm-1 are obvious indicating that hydroxyl group of the polyols formed. In NMR, the presence of new signal at δ 3.46ppm (-CH-OH) showed the attachment of hydroxyl group onto the epoxidized palm oil.

Efficient and Regioselective Ring-opening of Epoxides with Carboxylic Acid Catalyzed by Graphite Oxide

2020 ◽  
Vol 17 (7) ◽  
pp. 532-538
Author(s):  
Maryam Mirza-Aghayan ◽  
Mahdieh Molaee Tavana ◽  
Elaheh Golam Alipour Niazi ◽  
Rabah Boukherroub
Keyword(s):  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Graphite Oxide ◽  
Ring Opening ◽  
Reaction Times ◽  
Metal Free ◽  
Ring Opening Reaction ◽  
Ring Opening Of Epoxides ◽  
Acid Catalyzed

An efficient, simple and regioselective ring-opening reaction of epoxides with various carboxylic acids under metal-free conditions is reported. The ring-opening of epoxides takes place in the presence of graphite oxide as an efficient and available catalyst to produce the corresponding 2-hydroxy monoester and 1,2-diester derivatives in good yields. Regioselective attack of the nucleophile, short reaction times, metal-free conditions and reusability of catalyst are among the advantages of the present protocol.

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