摘要:
A novel process for producing mercaptophenols by the hydrogenolysis of polythiobisphenols in the presence of a nickel catalyst is disclosed. Raney nickel catalyst which is in advance poisoned with an organosulfur compound in which the sulfur atom has unshared electron pairs is especially effective as a catalyst. A process for producing polythiobisphenols which comprises: reacting a phenol having the general formula wherein each R independently represents a hydrogen, a halogen or an alkyl, with sulfur monochloride in a polar organic solvent in the presence of a nitrogen-containing organic compound as a catalyst which is selected from the group consisting of tertiary amines, quaternary ammoniums, alkylated acid amides and heteroaromatic compounds, in amounts of about 1-30 % by weight based on the amount of the phenol used. As a catalyst, bromine or an alkali metal halide is also usable.
摘要:
The invention provides compounds of the general formula (I) and physiologically acceptable salts and solvates thereof, wherein Ar represents the group where Q¹ represents a straight or branched C₁₋₃alkylene group, where Q² represents a group R³CO-, R³NHCO-, R³R⁴NSO₂- or R⁵SO₂-, where R³ and R⁴ each represent a hydrogen atom or a C₁₋₃alkyl group, and R⁵ represents a C₁₋₃alkyl group, R represents a hydrogen atom or a C₁₋₃alkyl group; R¹ and R² each independently represent a hydrogen atom or a methyl or ethyl group; and k represents an integer from 1 to 8; m represents zero or an integer from 2 to 7, and; n represents an integer from 1 to 7 with the proviso that the sum total of k, m and n is 4 to 12; X represents an oxygen or sulphur atom, and; Y and Z each represent a bond, or an oxygen or sulphur atom with the proviso that when Y is a bond m is zero, or when Y represents an oxygen or sulphur atom m is an integer from 2 to 7, or when Y and Z each independently represent an oxygen or sulphur atom then n is an integer from 2 to 7; Q represents a naphthalenyl group which may optionally be substituted by one or two groups selected from C₁₋₄alkyl, C₁₋₄alkoxy, hydroxy and halogen. The compounds have a stimulant action at β₂-adrenoreceptors and may be used in the treatment of diseases associated with reversible airways obstruction such as asthma and chronic bronchitis.
摘要:
A process for preparing a fluorine-substituted alicyclic diol comprising hydrogenating in the presence of a catalyst a fluorine-substituted aromatic diol represented by formula (I): wherein Ph represents a divalent organic group containing at least one aromatic group, to obtain the fluorine-substituted alicyclic diol represented by formula (II): wherein Ph(H) represents a divalent organic group containing at least one perhydroaromatic group.
摘要:
The invention related to a process for the preparation of a bismercaptodiether by reacting a polysulfide with a monothiol in the presence of a base and to a process for the depolymerization of a polysulfide by reacting said polysulfide with a monothiol in the presence of a base. These processes enable the preparation of bismercaptodiethers without inorganic salt formation.
摘要:
The invention features 4-((phenoxyalkyl)thio)-phenoxyacetic acids and analogs, compositions containing them, and methods of using them as PPAR modulators to treat or inhibit the progression of, for example, dyslipidemia.