Abstract:
PROBLEM TO BE SOLVED: To provide a process for preparation of an alkenylphosphonic acid derivative free from formation of a coupling product, accepting reaction temperature below 200°C, accepting high yield more than 75%, being sufficient without use of an expensive noble metal catalyst and having improved yield and selectivity compared to conventional process. SOLUTION: The invention relates to the process for preparation of the alkenylphosphonic acid derivative by reacting the phosphonic acid derivative in the presence of an alkyne and a complex catalyst system, wherein the complex catalyst system comprise (a) nickel and (b) a phosphine having at least two trivalent phosphorus atoms and/or (c) a phosphine having one trivalent phosphorus atom, in which the addition of the alkyne is carried out after at least one minute of contact of the phosphonic acid derivative with the complex catalyst system. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a process for preparation of an alkenylphosphonic acid derivative. SOLUTION: The invention relates to the process for preparation of the alkenylphosphonic acid derivative comprising reaction of a phosphonic acid derivative and an alkyne in the presence of a complex catalyst system, wherein the complex catalyst system comprises (a) nickel, (b) a phosphine having at least two trivalent phosphorus atoms and additionally (c) a phosphine having a trivalent phosphorus atom. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
The invention relates to a method for producing a coating of a porous, electrically conductive support material (1) with a dielectric (2) by means of a solution of precursor compounds of the dielectric at a concentration of less than 10 percent by weight relative to the proportion of the dielectric in the total weight of the solution. Also disclosed is the production of capacitors with the aid of said method.
Abstract:
In the preparation of an alkenylphosphonic acid derivative by reacting a phosphonic acid derivative (A) with an alkyne (B), the complex catalyst system (C) used comprises (a) nickel and (b) a phosphine (II) with at least 2 trivalent phosphorus atoms and/or (c) a phosphine (II) with one trivalent phosphorus atom and (B) is added only after (A) has been brought into contact with (C) for at least 1 minute.
Abstract:
In the preparation of an alkenylphosphonic acid derivative by reacting a phosphonic acid derivative with an alkyne, the complex catalyst system used comprises (a) nickel, (b) a phosphine (II) with at least 2 trivalent phosphorus atoms and also (c) a phosphine (II) with one trivalent phosphorus atom.
Abstract:
The invention relates to a capacitor having a porous electrically conductive substrate on whose inner and outer surfaces a first layer of a dielectric and an electrically conductive second layer are applied. The invention also relates to a method for the production of such capacitors and to their use in electrical and electronic circuits.
Abstract:
The invention relates to a capacitor having a porous electrically conductive substrate on whose inner and outer surfaces a first layer of a dielectric and an electrically conductive second layer are applied. The invention also relates to a method for the production of such capacitors and to their use in electrical and electronic circuits.