benzofurans and potassium-hydroxide

benzofurans has been researched along with potassium-hydroxide* in 2 studies

Other Studies

2 other study(ies) available for benzofurans and potassium-hydroxide

Article	Year
The selective reaction of aryl halides with KOH: synthesis of phenols, aromatic ethers, and benzofurans. Journal of the American Chemical Society, 2006, Aug-23, Volume: 128, Issue:33 The direct and selective synthesis of phenols from aryl/heteroaryl halides and KOH has been achieved through the use of highly active monophosphine-based catalysts derived from Pd(2)dba(3) and ligands L1 or L2 and the biphasic solvent system 1,4-dioxane/H(2)O. We have also demonstrated a one-pot method of phenol formation/alkylation for the preparation of alkyl aryl ethers from aryl halides. In many instances, this protocol overcomes limitations in existing Pd-catalyzed coupling reactions of aliphatic alcohols with aryl halides. Finally, we demonstrate that substituted benzofurans can be prepared efficiently via a Pd-catalyzed phenol formation/cyclization protocol starting from 2-chloroaryl alkynes. Topics: Benzofurans; Catalysis; Ethers, Cyclic; Hydroxides; Ligands; Molecular Structure; Palladium; Phenols; Potassium Compounds	2006
Evaluation of an aqueous KOH digestion followed by hexane extraction for analysis of PCDD/Fs and dioxin-like PCBs in retailed fish. Analytical and bioanalytical chemistry, 2003, Volume: 375, Issue:6 Aqueous KOH digestion followed by hexane extraction has been employed in the extraction of dioxins (polychlorinated dibenzo- p -dioxins, dibenzofurans and dioxin-like polychlorinated biphenyls) for biological samples, but there are no reports on its evaluation. Therefore, we report here the evaluation of this extraction for the analysis of dioxins in retailed fish. The effect of the alkaline digestion on dioxins was evaluated by estimation of recoveries. The recoveries of dioxins after the alkaline digestion were good (79-106%) in various kinds of retailed fish except tuna. In tuna, loss of octachlorodibenzofuran (OCDF) was clearly observed, however, the loss was corrected by internal-standard quantification; (13)C12-labeled OCDF was added before the alkaline digestion. Comparative study showed that alkaline digestion followed by hexane extraction provides extraction efficiencies of dioxins equal to those of conventional Soxhlet extraction in fish. Additionally, in analysis of a certified reference fish sample with this extraction, the values obtained for certified isomers were almost equal to the certified values. Since the present method is very simple and inexpensive, it would be useful for analysis of dioxins in retailed fish. Topics: Animals; Benzofurans; Dibenzofurans, Polychlorinated; Fishes; Food Contamination; Hexanes; Hydroxides; Polychlorinated Biphenyls; Polychlorinated Dibenzodioxins; Potassium Compounds; Water	2003

Article

Year

The selective reaction of aryl halides with KOH: synthesis of phenols, aromatic ethers, and benzofurans.

Journal of the American Chemical Society, 2006, Aug-23, Volume: 128, Issue:33

The direct and selective synthesis of phenols from aryl/heteroaryl halides and KOH has been achieved through the use of highly active monophosphine-based catalysts derived from Pd(2)dba(3) and ligands L1 or L2 and the biphasic solvent system 1,4-dioxane/H(2)O. We have also demonstrated a one-pot method of phenol formation/alkylation for the preparation of alkyl aryl ethers from aryl halides. In many instances, this protocol overcomes limitations in existing Pd-catalyzed coupling reactions of aliphatic alcohols with aryl halides. Finally, we demonstrate that substituted benzofurans can be prepared efficiently via a Pd-catalyzed phenol formation/cyclization protocol starting from 2-chloroaryl alkynes.

Topics: Benzofurans; Catalysis; Ethers, Cyclic; Hydroxides; Ligands; Molecular Structure; Palladium; Phenols; Potassium Compounds

2006

Evaluation of an aqueous KOH digestion followed by hexane extraction for analysis of PCDD/Fs and dioxin-like PCBs in retailed fish.

Analytical and bioanalytical chemistry, 2003, Volume: 375, Issue:6

Aqueous KOH digestion followed by hexane extraction has been employed in the extraction of dioxins (polychlorinated dibenzo- p -dioxins, dibenzofurans and dioxin-like polychlorinated biphenyls) for biological samples, but there are no reports on its evaluation. Therefore, we report here the evaluation of this extraction for the analysis of dioxins in retailed fish. The effect of the alkaline digestion on dioxins was evaluated by estimation of recoveries. The recoveries of dioxins after the alkaline digestion were good (79-106%) in various kinds of retailed fish except tuna. In tuna, loss of octachlorodibenzofuran (OCDF) was clearly observed, however, the loss was corrected by internal-standard quantification; (13)C12-labeled OCDF was added before the alkaline digestion. Comparative study showed that alkaline digestion followed by hexane extraction provides extraction efficiencies of dioxins equal to those of conventional Soxhlet extraction in fish. Additionally, in analysis of a certified reference fish sample with this extraction, the values obtained for certified isomers were almost equal to the certified values. Since the present method is very simple and inexpensive, it would be useful for analysis of dioxins in retailed fish.

Topics: Animals; Benzofurans; Dibenzofurans, Polychlorinated; Fishes; Food Contamination; Hexanes; Hydroxides; Polychlorinated Biphenyls; Polychlorinated Dibenzodioxins; Potassium Compounds; Water

2003