摘要:
Improvement in the process for preparing biaryl compounds via coupling of an arylamine with an arene in the presence of a nitrite, an acid and copper metal or a derivative thereof; the improvement is consisting in adding to the reaction mixture a trialkylorthoformate. The process may be used for preparing drugs such as Flurbiprofen and Xenbucin or intermediate compounds particularly useful for preparing Flurbiprofen, Flufenisal, Chlordimorin, Xenbucin, Xenysalate, Xenyhexenic acid and the like.
摘要:
Process for preparing an arylalkanoic acid by adding iodine to a mixture of an arylalkanone and an excess of an orthoester, heating of the mixture thus obtained, adding an inorganic base and finally an acid.
摘要:
The present invention relates to a process for the preparation of iodinated phenols; in particular; it relates to a process including the direct iodination, with suitably activated iodine, of 3,5-disubstituted phenol compounds to the corresponding 3,5-disubstituted-2,4,6-triiodophenols, which are useful intermediates for the synthesis of x-ray contrast media, and to the preparation of the contrast media themselves.
摘要:
The present invention relates to a process for the preparation of iodinated phenols; in particular; it relates to a process including the direct iodination, with suitably activated iodine, of 3,5-disubstituted phenol compounds to the corresponding 3,5-disubstituted-2,4,6-triiodophenols, which are useful intermediates for the synthesis of x-ray contrast media, and to the preparation of the contrast media themselves.
摘要:
A crosslinkable elastomeric composition includes at least one diene elastomeric polymer and at least one organic quaternary ammonium salt. The at least one diene elastomeric polymer may have a glass transition temperature (Tg) below 20° C. The at least one organic quaternary ammonium salt may be present in an amount from 0.1 phr to 10 phr. The elastomeric composition may include at least one primary accelerator selected from thiazoles, sulphenamides, and/or xanthogenates. The elastomeric composition may be substantially free of additional secondary accelerators. The elastomeric composition may include at least one reinforcing filler, such as carbon black and/or silica. A tyre for a vehicle wheel includes at least one structural element including the elastomeric composition. The tyre may include a carcass structure, a belt structure, a tread band, and a pair of sidewalls. The at least one structural element including the elastomeric composition may be the tread band.
摘要:
The present invention refers to the use of novel molecules able to bind tenaciously to silica, borosilicate and silicate surfaces, and thus to modify their properties and characteristics. When applied to silica-based chromatography, it offers important advantages in all cases in which it is necessary to modulate the interaction of analytes with the stationary phase. In capillary zone electrophoresis (CZE), such compounds will eliminate or invert the electroendoosmostic (EEO) flow, greatly simplifying the analysis of negatively-charged compounds and permitting the analysis of bio(macro)molecules via the direct use of naked capillaries.
摘要:
Phenols are oxidated to quinones with hydrogen peroxide in the presence of catalytic amounts of bromine, iodine, hydrogen bromide and hydrogen iodide.
摘要:
Process for manufacturing tires includes the following steps: forming at least one layer including a crosslinkable elastomeric material on an outer surface of a toroidal support the shape of which substantially matches that of the inner surface of the tire; manufacturing a green tire on the toroidal support bearing the at least one layer, the green tire including at least one structural element including a crosslinkable elastomeric material; wherein one crosslinkable elastomeric material of the at least one layer includes a crosslinkable elastomeric composition including at least one sulfur-curable elastomeric polymer and at least one compound having the following general formula (I): A-(S)p—B wherein: p is an integer of 2 to 10; and A and B, which may be the same or different from each other, represent a group having the following general formula (II):
摘要:
A fuel of an emulsion between water and a liquid hydrocarbon. The emulsion is stabilized by adding a polymeric surfactant obtainable by reaction between: (i) a polyolefin oligomer functionalized with at least one group deriving from a dicarboxylic acid, or a derivative thereof; and (ii) a polyoxyalkylene of linear oxyalkylene units. The polyoxyalkylene is linked to a long-chain alkyl group optionally containing one or more ethylenic unsaturations. The fuel has high stability over time, without forming carbonaceous deposits which adhere to metal surfaces.
摘要:
A method of preparing ketoprofen by reacting aniline with a halide of an alpha-halogen propionic acid, benzylation of 3-methyl-2-indolinone, alkaline hydrolysis of 5-benzyl-3-methyl-2-indolinone, deamination of 2-(3-benzyl-6-aminophenyl)propionic acid and oxidation of 2-(3-benzylphenyl)propionic acid.