scholarly journals Synthesis and reactivity of aliphatic sulfur pentafluorides from substituted (pentafluorosulfanyl)benzenes

2016 ◽  
Vol 12 ◽  
pp. 110-116 ◽  
Author(s):  
Norbert Vida ◽  
Jiří Václavík ◽  
Petr Beier
Keyword(s):  
Hydrogen Peroxide ◽  
Sulfuric Acid ◽  
Maleic Anhydride ◽  
Acrylic Acid ◽  
Maleic Acid ◽  
Chemical Reactivity ◽  
Aqueous Media ◽  
Diels Alder ◽  
Plausible Mechanism

Oxidation of 3- and 4-pentafluorosulfanyl-substituted anisoles and phenols with hydrogen peroxide and sulfuric acid provided a mixture of SF5-substituted muconolactone, maleic, and succinic acids. A plausible mechanism for the formation of the aliphatic SF5 compounds was presented and their chemical reactivity was investigated. SF5-substituted para-benzoquinone was synthesized; its oxidation led to an improved yield of 2-(pentafluorosulfanyl)maleic acid. The reaction of SF5-substituted maleic anhydride and para-benzoquinone with cyclopentadiene afforded the Diels–Alder adducts. Decomposition of 3-(pentafluorosulfanyl)muconolactone in acidic, neutral and basic aqueous media was investigated and the decarboxylation of 2-(pentafluorosulfanyl)maleic acid provided 3-(pentafluorosulfanyl)acrylic acid.

Dispersion of barium titanate with poly(acrylic acid-co-maleic acid) in aqueous media

2004 ◽  
Vol 30 (7) ◽  
pp. 1985-1988 ◽  
Author(s):  
Jianling Zhao ◽  
Xiaohui Wang ◽  
Zhilun Gui ◽  
Longtu Li
Keyword(s):  
Barium Titanate ◽  
Acrylic Acid ◽  
Maleic Acid ◽  
Aqueous Media ◽  
Poly Acrylic Acid

ChemInform Abstract: In situ Vinylindole Synthesis. Diels-Alder Reactions with Maleic Anhydride and Maleic Acid to Give Tetrahydrocarbazoles and Carbazoles.

ChemInform ◽  
2010 ◽  
Vol 27 (29) ◽  
pp. no-no
Author(s):  
W. E. NOLAND ◽  
G.-M. XIA ◽  
K. R. GEE ◽  
M. J. KONKEL ◽  
M. J. WAHLSTROM ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Maleic Acid ◽  
Diels Alder

In situ vinylindole synthesis. Diels-Alder reactions with maleic anhydride and maleic acid to give tetrahydrocarbazoles and carbazoles

Tetrahedron ◽  
1996 ◽  
Vol 52 (13) ◽  
pp. 4555-4572 ◽  
Author(s):  
Wayland E. Noland ◽  
Guang-Ming Xia ◽  
Kyle R. Gee ◽  
Michael J. Konkel ◽  
Mary J. Wahlstrom ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Maleic Acid ◽  
Diels Alder

Synthesis and Performance of a Modified Polyether-Type Superplastizer by Hydroxypropylmethyl Cellulose

2012 ◽  
Vol 236-237 ◽  
pp. 21-25
Author(s):  
Xin Jian Fu ◽  
Wan Hui Wang ◽  
Zhan Ying Zhang ◽  
Hong Yi Zhao ◽  
Hua Yu Zhu ◽  
...  
Keyword(s):  
Free Radical ◽  
Maleic Anhydride ◽  
Acrylic Acid ◽  
Radical Polymerization ◽  
Hydroxy Group ◽  
Cement Paste ◽  
Maleic Acid ◽  
Cement Hydration ◽  
Negative Impact ◽  
And Performance

Propylmethyl cellulose monoester of maleic acid (MAPMC) was synthesized with Propylmethyl cellulose and Maleic anhydride. A modified polyether-type superplastizer (PES) was prepared from ally polyoxyethylenether, Maleic anhydride, acrylic acid and MAPMC through a free radical polymerization. MAPMC and PES were recorded by FTIR. The fluidity of cement paste were investigated, the hydration process of cement for PES were characterized via Hydration Heat Tester. The results indicate that PES superplastizers can improve the fluidity of mortars and more capable of preventing slump loss, the hydroxy group of PES has no negative impact on cement hydration .

Isolation and identification of by-products of gas phase catalytic oxidation of anthracene to 9,10-anthraquinone

1983 ◽  
Vol 48 (1) ◽  
pp. 112-122 ◽  
Author(s):  
Ivan Chvátal ◽  
Jan Vymětal ◽  
Jaroslav Pecha ◽  
Vilím Šimánek ◽  
Ladislav Dolejš ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Catalytic Oxidation ◽  
Gas Phase ◽  
Phthalic Anhydride ◽  
Maleic Acid ◽  
Phthalic Acid ◽  
Diels Alder ◽  
Acid Anhydride ◽  
Isolation And Identification ◽  
By Products

A total of 29 associate components were identified in technical 9,10-anthraquinone. The product contained all the prominent impurities present in the starting anthracene except for 9,10-dihydroanthracene and fluorene. 9-(9'-Anthryl)-carbazole and Diels-Alder type adducts of anthracene with maleic anhydride and with maleinimide were also detected. The isolated and identified by-products of oxidation of anthracene were 1,4-anthraquinone, 4,4'-dioxo-1,1'-bianthrylidene, 4,10'-dioxo-1,9'-bianthrylidene, 1-(4'-oxy-1'-naphthylidene)-4-oxyanthracene, 2,3-naphthalenedicarboxylic acid and anhydride, and 5,7,12,14-tetrahydro-5,14;7,12-di(o-benzeno)pentacene-6,13-dione. Of the compounds formed by oxidation of the anthracene impurities, isolated and identified were dibenzo[b,d]pyrone, xanthone, 1,8-naphthalenedicarboxylic acid anhydride,9-fluorenone, and naphthol[2,3-b]thiophene-4,9-dione. As products of a deeper oxidation of the starting compounds, phthalic anhydride, maleic anhydride, maleinimide, phthalic acid, and maleic acid were found. Four additional components whose structure could not be determined were also isolated. The pathway of the anthracene oxidation is suggested.

Cyclopentadienyl-, Indenyl- und Trifluormethylcyclopentadienyl-Cobalt-Komplexe mit Akzeptor-substituierten Olefinen als Liganden / Cyclopentadienyl, Indenyl and Trifluoromethylcyclopentadienyl Cobalt Complexes with Acceptor-Substituted Olefins as Ligands

1991 ◽  
Vol 46 (10) ◽  
pp. 1364-1376 ◽  
Author(s):  
Helmut Werner ◽  
Joachim Mahr
Keyword(s):  
Maleic Anhydride ◽  
Acrylic Acid ◽  
Metal Complexes ◽  
Fumaric Acid ◽  
Maleic Acid ◽  
Energy Barrier ◽  
Acid Amide ◽  
Cobalt Complexes ◽  
Cobalt Compounds

The complexes C5H5Co(PMe3)2 (1), C9H7Co(PMe3)2 (2) and (C5H4CF3)Co(PMe3)2 (3) react with mono- and disubstituted ethenes such as styrene, acrylic acid methylester, methylvinylketone, acroleine, acrylic acid amide, acrylonitrile, maleic anhydride, maleic and fumaric acid dimethylester, and fumaric dinitrile to give the olefin(phosphane)cobalt compounds (ring)Co(PMe3)(olefin) (4-32) in good to excellent yields. With acrylonitrile, two different rotamers are obtained which indicates that there is a considerable energy barrier for rotation around the metal-olefin bond. The reactions of 1 and 3 with maleic acid dimethylester (MDE) lead not only to the formation of the expected products (ring)Co(PMe3)(MDE) (22, 23) but also to the thermodynamically favored isomers (ring)Co(PMe3)(FDE) (24, 26) containing fumaric acid dimethylester (FDE) as ligand. A similar isomerization has been observed upon treatment of 2 and 3 with fumaric dinitrile (FDN) which gives besides the complexes (ring)Co(PMe3)(FDN) (29, 31) also the maleic dinitrile (MDN) derivatives (ring)Co(PMe3)(MDN) (30, 32). The olefin(trimethylphosphane)cobalt compounds are surprisingly inert and neither on photolysis nor on heating give the isomeric hydrido(vinyl)metal complexes.

Reactions of macroions with ester and carboxylic groups of polymers

1987 ◽  
Vol 52 (9) ◽  
pp. 2194-2203
Author(s):  
Miloslav Kučera ◽  
Dušan Kimmer ◽  
Karla Majerová ◽  
Josef Majer
Keyword(s):  
Maleic Anhydride ◽  
Acrylic Acid ◽  
Methyl Methacrylate ◽  
Bond Formation ◽  
Covalent Bond ◽  
The Other ◽  
Poly Methyl Methacrylate ◽  
Other Hand ◽  
Carboxylic Groups ◽  
Poly Acrylic Acid

In the reaction of dianions with poly(methyl methacrylate), only an insignificant amount of insoluble crosslinked product is obtained. If, however, the concentration of grafting dianions approaches that of ester groups, the amount of poly(methyl methacrylate) which may thus be crosslinked becomes quite significant. Dications, too, can bring about crosslinking of only an insignificant number of poly(methyl methacrylate) chains. Carboxylic groups in poly(acrylic acid) react with dianions and dications in an anhydrous medium similarly to ester groups. On the other hand, in the presence of a cocatalytic amount of water dications are more readily bound to carboxylic groups, forming a covalent bond. The relatively highest efficiency was observed in the bond formation between dication and the poly[styrene-alt-(maleic anhydride)], both in an anhydrous medium and in the presence of H2O.

Synthesis and ethylene-promoted metathesis of adducts of tandem [4+2]/[4+2] cycloaddition between bis-furyl dienes and maleic acid derivatives

2021 ◽  
Vol 45 (7) ◽  
pp. 3400-3407
Author(s):  
Elizaveta A. Kvyatkovskaya ◽  
Polina P. Epifanova ◽  
Eugeniya V. Nikitina ◽  
Aleksey A. Senin ◽  
Victor N. Khrustalev ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Maleic Acid

A series of 1,4:5,8-diepoxynaphthalenes, annellated with carbo- and heterocycles, was synthesized based on the tandem intermolecular/intramolecular [4+2] cycloaddition of bis-furyl dienes with moderately to highly reactive cyclic dienophiles (maleic anhydride and maleinimides).

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