摘要:
Phenolic compounds, notably admixtures of 2,4-dichlorophenol and 2,6-dichlorophenol, are selectively chlorinated at the ortho positions thereof, with gaseous chlorine and in a molten medium, in the presence of a selectivity-enhancing effective amount of an organic cation.
摘要:
Ortho-substituted phenolic compounds, e.g., 2,6-dichlorophenol, are selectively chlorinated, e.g., into 2,4,6-trichlorophenol, with gaseous chlorine in either the molten state or in a solvent medium, in the presence of a selectivity-enhancing effective amount of an organic cation.
摘要:
The chlorophenols, e.g., 2,4,6-trichlorophenol, are efficiently prepared by chlorinating an ortho-/para-substituted phenolic compound with gaseous chlorine, whether in molten state or in a solvent reaction medium, in the presence of a catalytically effective amount of a primary, secondary or tertiary amine.
摘要:
The polychlorophenols, e.g., 2,6-dichlorophenol (a known agrochemical intermediate), are effectively prepared by chlorinating ortho-chlorophenol with gaseous chlorine, optionally in the presence of other chlorophenols, characteristically in the molten state, and in the presence of a catalytically effective amount of a primary, secondary or tertiary amine.
摘要:
The present invention relates to a method for preparing a highly pure trifluoromethanesulphinic acid. The method of the invention for preparing a highly pure trifluoromethanesulphinic acid, starting from an aqueous mixture comprising a trifluoromethanesulphinic acid salt, a trifluoroacetic acid salt and saline impurities resulting from the method for preparing same, is characterized in that said mixture is subjected to the following operations: —acidification such that the trifluoroacetic acid salt and the triflinic acid salt are released in an acid form, —separation of the trifluoroacetic acid and trifluoromethanesulphinic acid by distillation enabling the trifluoroacetic acid to be recovered at the top of the distillation and the trifluoromethanesulphinic acid to be recovered at the bottom of the distillation, —separation by distillation of the trifluoromethanesulphinic acid present in the distillation residue previously obtained.
摘要:
Sulfonic acid anhydrides, and more particularly triflic anhydride, are prepared by reacting a sulfonic acid or a mixture of two sulfonic acids with a reactant exhibiting acid pseudohalide tautomerism and containing at least one carbon atom which is involved in the tautomerism bearing two halogen atom substituents.
摘要:
The invention relates to a method of treating an impure organic composition of ammonium imide, one of the substituents of which imide ion is a sulfonyl carried by a perhalogenated, advantageously perfluorinated carbon, characterized in that said composition is subjected to a step of liquid-liquid extraction by means of an aqueous phase and containing, as impurity, at least one of the chemical species chosen from halides, sulfonates and sulfinates, in particular those whose sulfur is carried by a perhalogenated carbon.
摘要:
A process for preparing alpha-hydroxycarboxylic acids. An organic halide is reacted with carbon monoxide and a hydrogen donor compound, in the presence of a carbonylation catalyst and an inorganic base, at a temperature of at least 90.degree. C.
摘要:
The arylaminoaluminums, well adopted as catalysts for the ortho-alkylation of aromatic amines with an olefin, are facilely prepared by reacting at least one aromatic amine with metallic aluminum in the presence of a catalytically effective amount of iodine, or precursor compound thereof which generates elemental iodine under the conditions of reaction.
摘要:
A server system is connected to a number of remote displays for messages for broadcasting by a communication network. The audiovisual messages received from the server system are made perceptible for customers. The customers can send coded instruction signals to a first access device, located near a display, by portable customer badges, which are transmitted to the server system which then establishes a back-up communication with the customer, for example, through a portable telephone. The customer can thus simply establish communication and, when the server system has information specifically concerning the above, the information need not be transmitted over the network.