Abstract:
PROBLEM TO BE SOLVED: To economically prepare 2-alkyne-1-acetal with a high selectivity and in a high product yield. SOLUTION: In a preparation method of 2-alkyne-1-acetal of formula I (wherein substituents are as indicated in the patent claim), a compound of formula III (wherein R 1 is as indicated in formula I) is electrochemically oxidized either in the presence of a 1-6C alkyl alcohol (alcohol A) or in the form of a substance. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
The invention relates to a method for producing hydroxy-substituted biarylene by the electrolytic oxidative electrodimerisation of a corresponding hydroxy-substituted aromatic, with the aid of an anodic surface containing a doped diamond layer.
Abstract:
The invention relates to a method for the electrolytic oxidative alkoxylating cleavage of 1,2-diarylethane derivatives by electrolytically oxidizing the respective 1,2-diarylethane derivative in a solvent containing the alcohol required for alkoxylation, electrolytic oxidation being performed on a diamond electrode. The inventive method makes it possible to especially produce diaryl derivatives when a 1,2-diarylethane derivative in which the two aryl radicals are directly bonded to each other is used as a substrate.
Abstract:
The invention relates to a method for producing biarylalcohols by means of the electrodimerisation of arylalcohols, said method comprising the following steps: a) an aryloxy compound of the alcohol to be coupled is produced with an element from the group B and Al; b) the aryloxy compounds obtained in a) are electrolytically oxidised and coupled to form the corresponding biaryl derivatives; and c) the desired biaryl alcohols are released. The inventive method enables the dimerisation of arylalcohols with a high degree of selectivity in order to obtain an ortho product.
Abstract:
The invention relates to a method for producing diphenylphosphine oxide (DPPO) or its nucleus-substituted derivatives, diphenylphosphine (DPP) or its nucleus-substituted derivatives or phosphine (PP) or its nucleus-substituted derivatives, starting from triphenylphosphine oxide (TPPO) or the corresponding nucleus-substituted derivatives, or in the case of the production of DPP and PP, starting from triphenylphosphine (TPP) or the corresponding nucleus-substituted derivatives or DPPO. According to said method, the starting products are reduced electrochemically in the presence of ammonia or an amine.
Abstract:
A process for the preparation of 2,5-dihydrofuran derivatives substituted in the 3- or 4-position, which in the 2- or in the 5-position or at both positions each carry a C 1 - to C 6 -alkoxy radical (DHF-alkoxy derivatives 1), or 1,1,4,4-tetraalkoxy-but-2-ene derivatives substituted in the 3- or 4-position, from 2-butene-1 ,4-diol derivatives of the general formula (I) in which the radicals R 1 and R 2 independently of one another are hydrogen, C 1 - to C 6 -alkyl, C 6 - to C 12 -aryl or C 5 - to C 12 -cycloalkylene or R 1 and R 2 , together with the double bond to which they are bonded, form a C 6 - to C 12 -aryl radical or a mono- or polyunsaturated C 5 - to C 12 -cycloalkyl radical, or from their mixture with 2,5-dihydrofuran derivatives substituted in the 3- position or 4-position, which in the 2- or in the 5-position carry a C 1 - to C 6 -alkoxy radical, by electro-chemical oxidation in the presence of a C 1 - to C 6 -monoalkyl alcohol.
Abstract:
Electrochemical preparation of (a) an orthocarboxylate ester (I), derived from an aliphatic carboxylic acid and, to provide alkoxy groups, a primary aliphatic alcohol (III); or (b) an orthocarbonate (Ia), derived from (III), by oxidation at a diamond electrode. To prepare (I), the electrolyte contains (III) and an aliphatic aldehyde (IV) (or its acetal in which alkoxy groups are derived from (III)), or a mixture of these compounds; and to prepare (Ia), it contains (III) and (I).