摘要:
Process for the preparation of ß,Υ,Δ-unsaturated ketones and/or α,ß,Υ,Δ-unsaturated ketones by the reaction of an unsaturated alcohol with an enol ether or mixture of enol ethers, with formation of ketals as a by-product, at temperatures of from 50°C to 200°C, in the presence of an acid catalyst, whereby one or all of the reagents is/are heated to the reaction temperature of from 50°C to 200°C before the acid catalyst is added.
摘要:
The invention relates to secondary C10 to C18 surfactant alcohols of the general formula (I), wherein R represents methyl or ethyl and R' represents a linear or branched alkyl group with 6-13 C atoms, excepting 5-ethyl-2-nonanol and 6-ethyl-3-decanol, in addition to fatty alcohol alkoxylates, alkyl phosphates, alkyl sulphates, alkyl ether phosphates and alkyl ether sulphates. The secondary C10 to C18 surfactant alcohols can be produced by a simple aldol condensation of linear or branched saturated or unsaturated C7-C14 aldehydes, excepting 2-ethyl hexanal, with acetone or methyl ethyl ketone and the subsequent hydrogenation of the condensation product. In the preferred method, the aldol condensation is heterogenically catalysed under hydrogenation conditions and the saturated ketone that has been formed is subsequently hydrogenated.
摘要:
The invention relates to 3,3-dimethylcyclohexane derivatives of the general structure (I), wherein the broken line, which binds the carbon atoms that are in the alpha - and beta position in relation to the aldehyde group, represents a C-C single bond or a cis- or trans-configured C=C double bond. Said derivatives are characterized by interesting and original fragrance characteristics which diffuse extremely well and are suitable for use as perfumes, for example in cosmetic preparations, technical products or alcohol-based perfumery.
摘要:
The invention relates to a continuous method for production of cinnamaldehyde or cinnamaldehyde derivatives comprising continuous reaction of benzaldehyde derivatives with alkanals in the presence of bases and, optionally, as the final step, continuous hydrogenation in a recirculating reactor in the presence of a suspended catalyst and hydrogen to give dihydrocinnamaldehyde derivatives.
摘要:
Alcohols are prepared practically advantageously through hydrogenation of carbonyl compounds under mild conditions either by reacting a carbonyl compound with hydrogen in the presence of a bipyridyl derivative, a Group VIII transition metal complex and a base, or by reducing a carbonyl compound in the presence of a bipyridyl derivative, a Group VIII transition metal complex, a base and an alcoholic solvent.
摘要:
In producing nabumetone or precursors thereof, use is made of 2-bromo-6-methoxynaphthalene formed by: (a) methylating 6-bromo-2-naphthol with methyl bromide or methyl chloride, in a halogen-free liquid solvent comprising at least 40 % by weight of one or more compounds of the formula RZ where R is a hydrogen atom or an alkyl group, and Z is a hydroxyl group or a cyanide group with the proviso that if Z is a cyanide group, R is an alkyl group, and in the presence of at least one strong base; and (b) recovering and purifying 2-bromo-6-methoxynaphthalene so formed. The 6-bromo-2-naphthol in turn is preferably formed by reacting 1,6-dibromo-2-naphthol with hydrogen in a halogen-containing liquid solvent comprising at least 50 % by weight of: (A) at least one liquid organic halide solvent in which the halogen content has an atomic number of 35 or less, or (B) a mixture of water and at least one such liquid organic halide solvent, and in the presence of catalytic amounts of (i) a tungsten carbide-based catalyst, and (ii) at least one phase transfer catalyst, most preferably while purging HBr from the reaction mixture as it is formed. In this way, the quantities of by-products formed in the overall operation are reduced, the need for use of excess iron and/or dimethyl sulfate as reaction components is avoided, and the overall efficiency of plant operation is improved especially when conducted on a large scale.
摘要:
Indane dimer compounds of general formula 5, 6 or 9 and their pharmaceutical use, particularly to achieve smooth muscle relaxing activity and/or mast cell stabilising activity and/or antiinflammatory activity are described, wherein in formulae 5 and 9, R and R to R , and in formula 6, R , R and R to R , are selected from one or more of the same or different of: H, halo, hydroxy, alkoxy, aryloxy, acetoxy, carboxy, alkyl carbonyl, hydro carbonyl, amino, amido, alkylamino, hydroxylamino, amine oxide groups, azo groups, cyano, hydrazino groups, hydrazide groups, hydrazone groups, imide groups, iminoether groups, ureyl groups, oxime, nitro, nitrate, nitrite, nitroso groups, nitrile, heterocyclic groups containing one or more heteroatoms selected from N, O or S, aralkyl groups, mono and polybenzoid aryl groups, substituted aryl groups, thiol, thioureyl, phenylthiol groups, sulphonic acid groups, sulphoxide groups, sulphone groups, alkyl containing 1 to 10 carbon atoms or cycloalkyl groups containing 3 to 8 carbon atoms which may be saturated or unsaturated, substituted alkyl or cycloalkyl groups which may be saturated or unsaturated. In formulae 5, 6 and 9, X is O, NR (wherein R is acyl, alkyl or sulphonate groups), S, SO or SO2. In formulae 5, 6 and 9, any one or more of R , R ; R , R ; R , R ; R , R ; R , R and R , R may together represent oxo.
摘要翻译:描述了通式5,6或9的吲哚二聚体化合物及其药物用途,特别是实现平滑肌松弛活性和/或肥大细胞稳定活性和/或抗炎活性,其中在式5和9中,R 1和 R 3至R 15,并且在式6中,R 1,R 2和R 4至R 15选自以下相同或不同的一个或多个:H, 卤素,羟基,烷氧基,芳氧基,乙酰氧基,羧基,烷基羰基,氢羰基,氨基,酰胺基,烷基氨基,羟基氨基,氧化胺基,偶氮基,氰基,肼基,酰肼基,腙基,酰亚胺基,亚氨基醚基, 芴基,肟基,硝基,硝酸根,亚硝酸根,亚硝基,腈,含有一个或多个选自N,O或S的杂原子的杂环基,芳烷基,单和多芳族芳基,取代的芳基,硫醇,硫脲基,苯硫醇基 磺酸基,亚砜基,砜基,含1-10个碳原子的烷基或 可以是饱和或不饱和的,可以是饱和或不饱和的取代的烷基或环烷基的含有3-8个碳原子的环烷基。 在式5,6和9中,X是O,NR(其中R是酰基,烷基或磺酸酯基),S,SO或SO 2。 在式5,6和9中,R 1,R 1,R 2, R 2,R 1,R 2, R 3,R 1,R 3, R 9,R 1,R 9, R 10,R 10和R 14,R 14可以一起代表氧代。
摘要:
Tetrahydro-iso- alpha -acids ("THIAA") are prepared directly from iso- alpha -acids ("IAA") by hydrogenation. Free IAA are first dissolved in ethanol. The solution is then hydrogenated in the presence of a particular type of noble metal catalyst. Hydrogenation is controlled naturally by the reaction between the catalyst and the IAA so that the IAA will be selectively converted to THIAA without unacceptable perhydrogenation into other forms.