Search

Your search keyword '"4-benzoquinones"' showing total 3 results
Start Over Descriptor "4-benzoquinones" Topic organic chemistry
3 results on '"4-benzoquinones"'

1. Synthesis of 1,3,4-Thiadiazole, 1,3,4-Thiadiazine, 1,3,6-Thiadiazepane and Quinoxaline Derivatives from Symmetrical Dithiobiureas and Thioureidoethylthiourea Derivatives

Author

A. Abou-Zied, K. El-Shaieb, A. Mourad, and A. Hassan

Subjects
Tetrahalo-1, 4-benzoquinones, Cyclocondensation, Heterocyclic compounds., Organic chemistry, QD241-441
Abstract

Reactions of N,N`-disubstituted hydrazinecarbothioamides 8a-c and substituted thioureidoethylthioureas 9a-c with 2,3,5,6-tetrachloro-1,4-benzoquinone (chloranil, 10a) and 2,3,5,6-tetrabromo-1,4-benzoquinone (bromanil, 10b) to form N,N`-disubstituted [1,3,4]thiadiazole-2,5-diamines 11a-c, 6,7-dichloro-3-substituted amino-1H-benzo[1,3,4]- thiadiazine-5,8-diones 12a-c, 2,3,7,8-tetrahalothianthrene-1,4,6,9-tetraones 13a,b, 5,6,8- trihalo-7-oxo-3,7-dihydro-2H-quinoxaline-1-carbothioic acid substituted amides 14a-c, 15a-c and 7-substituted imino-[1,3,6]thiadiazepane-3-thiones 16a-c are reported. Rationales for the observed conversions are presented.

Published
2005
Full Text
View/download PDF

2. Convenient oxidation of alkylated phenols and methoxytoluenes to antifungal 1,4-benzoquinones with hydrogen peroxide (H2O2)/methyltrioxorhenium (CH3ReO3) catalytic system in neutral ionic liquid

Author

Sabrina Tempesta, Maurizio Barontini, Marcella Pasqualetti, Roberta Bernini, Enrico Mincione, and Giancarlo Fabrizi

Subjects
Antifungal, 4-benzoquinones, 1-butyl-3-methylimidazolium tetrafluoroborate [bmim]bf4, antifungal activity, catalytic oxidations, hydrogen peroxide/methyltrioxorhenium, Tetrafluoroborate, medicine.drug_class, Organic Chemistry, Alkylation, Biochemistry, Catalysis, chemistry.chemical_compound, chemistry, Drug Discovery, Ionic liquid, medicine, Organic chemistry, Phenol, Phenols, Hydrogen peroxide
Abstract

Alkylated phenol and methoxytoluene derivatives were catalytically and selectively oxidized to the corresponding 1,4-benzoquinones in good conversions and yields. Reactions were performed with hydrogen peroxide (H2O2)/methyltrioxorhenium (CH3ReO3) in 1-butyl-3-methylimidazolium tetrafluoroborate [bmim]BF4, a neutral ionic liquid. Compounds were tested in vitro for their antifungal activity against the growth of several widespread soil fungi. Some of them were proved to be potent inhibitors of Fusarium sp. than ketoconazole, a commercially available and expensive antifungal agent.

Published
2006
Full Text
View/download PDF

3. Synthesis of 1,3,4-Thiadiazole, 1,3,4-Thiadiazine, 1,3,6-Thiadiazepane and Quinoxaline Derivatives from Symmetrical Dithiobiureas and Thioureidoethylthiourea Derivatives

Author

Ashraf H. Abou-Zied, Alaa A. Hassan, Kamal M. El-Shaieb, and Aboul-Fetouh E. Mourad

Subjects
Models, Molecular, Molecular Conformation, Pharmaceutical Science, Thioacetamide, Heterocyclic compounds, Medicinal chemistry, Molecular conformation, Article, Analytical Chemistry, lcsh:QD241-441, chemistry.chemical_compound, Quinoxaline, Cyclocondensation, lcsh:Organic chemistry, Heterocyclic Compounds, Quinoxalines, Drug Discovery, Thiadiazoles, Disulfides, Sulfhydryl Compounds, Physical and Theoretical Chemistry, Thiadiazines, Organic Chemistry, Chloranil, Thiourea, Tetrahalo-1, 4-benzoquinones, Thiazoles, Tetrahalo-1,4-benzoquinones, chemistry, Chemistry (miscellaneous), Molecular Medicine, Toluene
Abstract

Reactions of N,N`-disubstituted hydrazinecarbothioamides 8a-c and substituted thioureidoethylthioureas 9a-c with 2,3,5,6-tetrachloro-1,4-benzoquinone (chloranil, 10a) and 2,3,5,6-tetrabromo-1,4-benzoquinone (bromanil, 10b) to form N,N`-disubstituted [1,3,4]thiadiazole-2,5-diamines 11a-c, 6,7-dichloro-3-substituted amino-1H-benzo[1,3,4]- thiadiazine-5,8-diones 12a-c, 2,3,7,8-tetrahalothianthrene-1,4,6,9-tetraones 13a,b, 5,6,8- trihalo-7-oxo-3,7-dihydro-2H-quinoxaline-1-carbothioic acid substituted amides 14a-c, 15a-c and 7-substituted imino-[1,3,6]thiadiazepane-3-thiones 16a-c are reported. Rationales for the observed conversions are presented.

Published
2005
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results