The monoalkylation of acetonitrile by primaryalcohols was achieved in a one-pot sequence in the presence of iridium catalysts. A diversity of nitriles has been obtained from aryl- and alkyl-methanols in excellent yield.
Friedel-Crafts alkylation of benzene by normal ?-chloroalkanoic acids and their methyl esters and nitriles
作者:L. I. Zakharkin、E. V. Anikina
DOI:10.1007/bf00959375
日期:1987.2
METHODS, APPARATUSES, AND SYSTEMS FOR MICROMECHANICAL GAS CHEMICAL SENSING CAPACITOR
申请人:Lazarus Nathan
公开号:US20110180884A1
公开(公告)日:2011-07-28
A capacitive chemical sensor, along with methods of making and using the sensor are provided. The sensors described herein eliminate undesirable capacitance by etching away the substrate underneath the capacitive chemical sensor, eliminating most of the substrate capacitance and making changes in the chemical-sensitive layer capacitance easier to detect.
Method, Apparatus, and System for Micromechanical Gas Chemical Sensing Capacitor
申请人:Fedder Gary
公开号:US20110316054A1
公开(公告)日:2011-12-29
A method for fabrication of capacitive environment sensors is provided in which the sensor elements are integrated in a CMOS structure with electronics through the use of complementary metal oxide semiconductor (CMOS) fabrication methods. Also provided are environment sensors fabricated, for example, by the method, and a measurement system using the environment sensors fabricated by the method. The described method includes etching away one of the metal layers in a CMOS chip to create a cavity. This cavity is then filled with an environment-sensitive dielectric material to form a sensing capacitor between plates formed by the metal adhesion layers or an array of contacts from other metal layers of the CMOS structure. This approach provides improved sensing capabilities in a system that is easily manufactured.
HIGHLY SELECTIVE CHEMICAL AND BIOLOGICAL SENSORS
申请人:Potyrailo Radislav Alexandrovich
公开号:US20120116683A1
公开(公告)日:2012-05-10
Methods and sensors for selective fluid sensing are provided. Each sensor includes a resonant inductor-capacitor-resistor (LCR) sensor that is coated with a sensing material. In order to collect data, an impedance spectrum is acquired over a relatively narrow frequency range, such as the resonant frequency range of the LCR circuit. A multivariate signature may be calculated from the acquired spectrum to discern the presence of certain fluids and/or fluid mixtures. The presence of fluids is detected by measuring the changes in dielectric, dimensional, resistance, charge transfer, and other changes in the properties of the materials employed by observing the changes in the resonant electronic properties of the circuit. By using a mathematical procedure, such as principal components analysis (PCA) and others, multiple fluids and mixtures can be detected in the presence of one another, even in a high humidity environment or an environment wherein one or more fluids has a substantially higher concentration (e.g. 10×, 1,000,000×) compared to other components in the mixture.