Ferricyanide Oxidation of 4-Arylazo-2,6-di-<i>t</i>-butylphenols
作者:Eiichiro Manda
DOI:10.1246/bcsj.46.2160
日期:1973.7
Alkaline ferricyanideoxidation of 4-arylazo-2,6-di-t-butylphenols (I) gave molecular nitrogen, diphenyl derivatives (VI), 2,6-di-t-butyl-p-benzoquinone-N-(3′,5′-di-t-butyl-4′-hydroxyphenyl)arylhydrazone (V) and red tarry compounds. Picryl derivative of phenol (I) gave 2,6-di-t-butyl-p-benzoquinone-picrylanil (X) instead of hydrazone (V). The reaction path was studied on the basis of isolated compounds
evolution of nitrogen upon addition of a DMSO solution of sodium nitrite. Orientations and partial rate factors for phenylation of substituted benzenes indicated that not phenyl cation but phenyl radical was produced as an intermediate. Hammett’s plots of partial rate factors of meta and para positions yielded good straight lines with ρm=0.46 and ρp=1.67. Plausible mechanisms were discussed. From m-dinitrobenzene
Apparatus and method for spatially detecting or quantifying chemical species
申请人:General Electric Company
公开号:US20030040118A1
公开(公告)日:2003-02-27
An apparatus provides for the detection, the determination of the location or the spatial distribution, and/or the quantification of an amount of a chemical species by allowing the chemical species to come into contact with a fluid medium contained in a permeable capillary, transferring the content of the capillary after the contact to a detector, and detecting the chemical species as the content of the capillary is transferred to a detector. The fluid medium can contain a selected reagent that selectively interacts with the chemical species to produce an optically detectable interaction product. The location and amount of the chemical species are determined from a characteristic of the chemical species or its interaction product measured on the content of the capillary and the time at which the characteristic is detected. The apparatus may be used in a method for detecting, determining the location or the spatial distribution of, and quantifying a wide range of chemical compounds, such as for monitoring chemicals in environment and industrial facilities and determining products in a combinatorial experiment.
An opto-acoustic wave sensor provides for the detection, the determination of the location, and/or the quantification of an amount of a chemical species using a selective chemical interaction of the chemical species and a selective reagent disposed on a surface of the opto-acoustic wave sensing element. The amount of the chemical species is detected by a change in the mass of the opto-acoustic wave-sensing element, which results in a detectable change in a resonance frequency of the sensing element. The identity of the chemical species is ascertained by an optical property of the product of the selective chemical interaction such as an absorbance or an intensity or other properties of the electromagnetic radiation emitted by the product. The sensor may be used in a method for detecting, determining the location or the spatial distribution of, and quantifying a wide range of chemical compounds, such as for monitoring chemicals in environment and industrial facilities and determining products in a combinatorial experiment.
A system that includes a device is provided in which the device includes a piezoelectric substrate; a sensor layer disposed on the substrate and operable to interact with, or react with, a target species; a first and a second electrode that are spaced from each other and in communication with the substrate; a first detector operable to detect the interaction or the reaction of the sensor layer with the target species based on a change in an optical characteristic of electromagnetic radiation propagated through the substrate; and a second detector operable to acoustically detect the interaction or the reaction of the sensor layer with the target species. Associated methods are provided.