172 results about "Diazonium Compounds" patented technology

The invention incorporates new processes for the chemical modification of carbon nanotubes. Such processes involve the derivatization of multi- and single-wall carbon nanotubes, including small diameter (ca. 0.7 nm) single-wall carbon nanotubes, with diazonium species. The method allows the chemical attachment of a variety of organic compounds to the side and ends of carbon nanotubes. These chemically modified nanotubes have applications in polymer composite materials, molecular electronic applications, and sensor devices. The methods of derivatization include electrochemical induced reactions, thermally induced reactions (via in-situ generation of diazonium compounds or pre-formed diazonium compounds), and photochemically induced reactions. The derivatization causes significant changes in the spectroscopic properties of the nanotubes. The estimated degree of functionality is ca. 1 out of every 20 to 30 carbons in a nanotube bearing a functionality moiety. Such electrochemical reduction processes can be adapted to apply site-selective chemical functionalization of nanotubes. Moreover, when modified with suitable chemical groups, the derivatized nanotubes are chemically compatible with a polymer matrix, allowing transfer of the properties of the nanotubes (such as, mechanical strength or electrical conductivity) to the properties of the composite material as a whole. Furthermore, when modified with suitable chemical groups, the groups can be polymerized to form a polymer that includes carbon nanotubes.

Disclosed is a positive-type photosensitive resin composition comprising: (a) an alkali-soluble resin; (b) a quinone diazide compound; (c) a heatsensitive compound which colors upon being heated and which shows an absorption maximum at a wavelength of not less than 350 nm and not more than 700 nm; and (d) a compound which does not have an absorption maximum at a wavelength of not less than 350 nm to less than 500 nm, and has an absorption maximum at a wavelength of not less than 500 nm and not more than 750 nm. The composition is preferably used for forming light-blocking separators or black matrices of organic electroluminescent devices and liquid crystal display elements.

Ruthenium and osmium carbene compounds that are stable in the presence of a variety of functional groups and can be used to catalyze olefin metathesis reactions on unstrained cyclic and acyclic olefins are disclosed. Also disclosed are methods of making the carbene compounds. The carbene compounds are of the formulawhere M is Os or Ru; R<1> is hydrogen; R is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted aryl; X and X<1> are independently selected from any anionic ligand; and L and L<1> are independently selected from any neutral electron donor. The ruthenium and osmium carbene compounds of the present invention may be synthesized using diazo compounds, by neutral electron donor ligand exchange, by cross metathesis, using acetylene, using cumulated olefins, and in a one-pot method using diazo compounds and neutral electron donors. The ruthenium and osmium carbene compounds of the present invention may be used to catalyze olefin metathesis reactions including, but not limited to, ROMP, RCM, depolymerization of unsaturated polymers, synthesis of telechelic polymers, and olefin synthesis.

The invention discloses a preparation method for 3-substituted indolone derivative. The preparation method comprises the steps of: using imine and diazo compound as materials, rhodium acetate and chiral phosphoric acid as catalysts and organic solvent as solvent, performing one-step reaction to acquire the 3-substituted indolone derivative. The preparation method has the advantages of high-efficiency atom economy, high selectivity, high yield, simple and safe operation and the like. With high diastereomeric selectivity and enantioselectivity, and bioactivity, the 3-substituted indolone derivative prepared by the method is applicable to the preparation application of anti-tumour medicines.

The present invention describes synthesis of new fluorinated elastomers presenting very low glass transition temperatures, a good resistance to bases, petroleum and fuels and good properties for forming. These elastomers contain, by way of example, from 90 to 50 mole % of vinylidene fluoride (VDF) and from 10 to 50 molar % of perfluoromethyl vinyl ether (PMVE). In this precise case, they are prepared by radical copolymerisation of VDF and with PMVE in presence of various organic initiators such as for example the peroxides, the peresters or the diazo compounds.

Disclosed is an improved process for the preparation of 4,5-diamino- 1-(substituted)pyrazoles and acid addition salts thereof by coupling the corresponding 5-amino-1-(substituted)pyrazole with an aromatic diazonium compound to produce an intermediate azo compound and contacting the intermediate azo compound with hydrogen in the presence of a hydrogenation catalyst to produce 4,5-diamino-1-(substituted)pyrazoles. Also disclosed is a decarboxylation process for the preparation of a 5-amino-1-(substituted)pyrazole by heating a solution comprising a 5-amino-4-carboxy-1-(substituted)pyrazole, an inorganic acid and an inert solvent.

A method for making diazo-compounds, diazonium salts thereof and other protected forms of these compounds. Diaz-compounds are prepared by reaction of a tertiary phosphine reagent carrying a reactive carbonyl group with an azide. The reaction can also generate an acyl triazene which can be converted thermally or by addition of base to form the diazo-compound or the acyl triazene can be isolated. The method is particularly useful for conversion of azides carrying one or more electron withdrawing groups to diazo-compounds. The method can be carried out in aqueous medium under mild conditions and is particularly useful for conversion of azido sugars to diazo-compound and diazonium salts thereof under physiological conditions. Tertiary phosphine reagents, particularly those that are water-soluble, and precursors for preparation of the reagents are provided.

The invention relates generally to optical agents, including Type 1 phototherapeutic agents, for biomedical applications, such as phototherapy. Provided are fused ring azo and diaza compounds comprising a plurality of fused rings including a first ring having an intra-ring azo or intra-ring diaza group capable of activation upon exposure to electromagnetic radiation in visible and / or infrared regions of the electromagnetic spectrum. Optical agents of the invention enable a versatile phototherapy platform for treatment of a range of pathological conditions, including the treatment of cancers, stenosis and inflammation. The invention further provides preparations and formulations comprising the fused ring azo and diaza compounds and methods of making and using the fused ring azo and diaza compounds as optical agents in in vivo or ex vivo biomedical procedures.

Methods and reagents for esterification of biological molecules including proteins, polypeptides and peptides. Diazo compounds of formula I:where R is hydrogen, an alkyl, an alkenyl or an alkynyl, RA represents 1-5 substituents on the indicated phenyl ring and RM is an organic group, which includes a label, a cell penetrating group, a cell targeting group, or a reactive group or latent reactive group for reaction to bond to a label, a cell penetrating group, or a cell targeting group, among other organic groups are useful for esterification of biological molecules. Also provided are diazo compounds which are bifunctional and trifunctional coupling reagents as well as reagents for the synthesis of compounds of formula I.

The invention discloses an isoquinoline compound as well as a preparation method and application thereof, and relates to the technical field of chemical synthesis. The isoquinoline compound is an indolo [2, 1-a] isoquinoline compound or a benzimidazo [2, 1-a] isoquinoline-6 (5H) ketone compound, and the preparation method comprises the following steps: dissolving a 1-(2, 3-diphenyl-1H-indole-1-yl)-2-methyl propenyl-1-ketone compound or a 1-methyl acryloyl-2-aryl-benzimidazole compound and an S-phenyl phenyl thiosulfonate compound in an organic solvent, adding tert-butyl benzoate oxide and a catalytic amount of copper bromide, and reacting at 110 DEG C to obtain the isoquinoline compound. The synthesis process does not need diazo compounds, has the characteristics of cheap and easily available raw materials, mild reaction conditions, simplicity and convenience in operation, high regioselectivity and high yield, and is beneficial to industrial production.