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| Number | Title | Issue Date |
| 7122642 | Method for producing crystal polymorphs and crystal polymorphs produced thereby A method to prepare new or unexpected polymorphs of materials which have not been observed, or to obtain a known polymorph under different conditions than those in which it is usually made, by using a laser to cause nucleation and crystal growth to occur in a supers... | 10/17/2006 |
| 7078477 | Process for producing solvent-soluble polyimide In the process of the present invention, a solvent-soluble polyimide is produced by polycondensing at least one tetracarboxylic acid component with at least one diamine component in a solvent in the presence of a tertiary amine. The tetracarboxylic acid component is... | 07/18/2006 |
| 7038068 | Method for liquid/liquid extraction of molecular weight fractions of perfluorinated polyethers A liquid/liquid extraction method is used for separating a perfluorinated polyether (PFPE) into two molecular-weight distributions using an alcohol or cyclic ether as one solvent and a fluorinated solvent as the other solvent. The more polar alcohol or cyclic ether ... | 05/02/2006 |
| 7014796 | Nonlinear optical compounds and methods for their preparation Nonlinear optically active compounds, methods for making nonlinear optically active compounds, compounds useful for making nonlinear optically active compounds, methods for making compounds useful for making nonlinear optically active compounds, macrostructures that... | 03/21/2006 |
| 6863782 | Method of preparing di(ketene acetals) Di(ketene acetals) are prepared by photoisomerizing the corresponding di(vinyl acetals). ... | 03/08/2005 |
| 6759521 | Polarization switching to control crystal form A method to select and prepare polymorphs of materials by switching the polarization state of light employing non-photochemical laser-induced nucleation. ... | 07/06/2004 |
| 6551467 | Microwave facilitated allyllic substitution The present invention is draw to microwave heating of a transition metal-catalysed organic reaction, in which a catalyst complex between a transition metal and an auxiliary ligand or ligands, the ligand being asymmetric or symmetric, monodentate or bident... | 04/22/2003 |
| 6506285 | Syntheses of 5,5'-diformyl-2-2'difuran and derivatives thereof A method of synthesizing 5,5'-diformyl-2,2'-difuran and derivatives thereof, including the steps of subjecting a reaction mixture of furfural or a derivative thereof to photochemical irradiation with a halogenated furfural in the presence of an acid scave... | 01/14/2003 |
| 6444098 | Process for the preparation of tocol acylates and tocopherol acylates The present invention relates to a process for preparing tocol acylate or tocopherol acylate having the following steps: a) combining tocol or tocopherol with an acylating agent to form a reaction mixture; b) irradiating the reaction mixture with microwave ene... | 09/03/2002 |
| 6426406 | Method for using laser light to control crystal form A method to prepare new or unexpected polymorphs of materials which have not been observed, or to obtain a known polymorph under different conditions than those in which it is usually made, by using a laser to cause nucleation and crystal growth to occur ... | 07/30/2002 |
| 6384239 | Method for producing monohalogenated 2-oxo-1,3-dioxolanes The invention relates to a process for the preparation of monohalogenated 2-oxo-1,3-dioxolanes of the general formula C3 H3 XO3 (I) in which X is Cl or Br, characterized in that the monohalogenation is carried out starting from ... | 05/07/2002 |
| 6180805 | Photochemical process for the production of previtamin D3 A photochemical process for the production of previtamin D3 or a derivative thereof from 7-dehydrocholesterol is disclosed. The process includes irradiating the 7-dehydrocholesterol in a reactor with a UV radiation source, wherein the UV source... | 01/30/2001 |
| 6136157 | Method for organic reactions Organic reactions catalyzed by palladium, except Pd/C, are conducted with heating by microwave energy. The preferred inorganic reactions involved are coupling reactions in which a new carbon-carbon bond is formed. Preferred reactions are the Heck, Stille ... | 10/24/2000 |
| 5854370 | Epoxy resin stilbenes and process for producing the same by photoisomerization The invention provides a cis-stilbene type epoxy resin having lower melting point and lower viscosity than the trans-stilbene type epoxy resin hitherto known. The stilbene type epoxy resin has a cis-isomer content of essentially 100%, or in the alternativ... | 12/29/1998 |
| 5705596 | Epoxy resin and process for producing the same The invention provides a cis-stilbene type epoxy resin having lower melting point and lower viscosity than the trans-stilbene type epoxy resin hitherto known. The stilbene type epoxy resin has a cis-isomer content of essentially 100%, or in the alternativ... | 01/06/1998 |
| 5484932 | Halogenation processes in advantageous solvents, and novel bistrifluoromethyl-polyfluoroalkoxybenzenes Compounds such as ##STR1## wherein R is F, CF3, CF2 H, CHF CF3 or CF2 CF3, as well as related compounds containing chlorine, are used as solvents in halogenation processes.... | 01/16/1996 |
| 5441612 | Radiation-enhanced recovery of maltol The yield and recovery of desirable aromatic principles such as maltol, from source material and especially from plant material, are improved by irradiating the source material with gamma radiation and then extracting from the irradiated material a produc... | 08/15/1995 |
| 5380935 | Process for preparing 5-aminolevulinic acid A process for preparing 5-aminolevulinic acid or a salt thereof, which comprises reacting furfurylamine, of which the amino group has been protected, with oxygen molecule under irradiation by light in the presence of a sensitizer; hydrogenating the result... | 01/10/1995 |
| 5344974 | Process for the preparation of N-acyl derivatives of 5-aminolevulinic acid, as well as the hydrochloride of the free acid The invention relates to a process for the preparation of N-acyl derivatives of 5-aminolevulinic acid of general formula R-CO-NH-CH2 -CO-CH2 -CH2 -COOH, in which R stands for methyl, ethyl, propyl, isopropyl, butyl, phenyl... | 09/06/1994 |
| 5277772 | Chemical modification of surfaces using heterocyclic azides The invention concerns a method for the chemical modification of a surface based on the reaction of photolytically generated reactive intermediates derived from azido heterocycles with said surface.... | 01/11/1994 |
| 5233054 | Process for the preparation of halophthalic anhydrides Halophthalic anhydrides are prepared by the liquid phase reaction of a brominating agent with halogen substituted hexa- or tetra-hydrophthalic anhydrides.... | 08/03/1993 |
| 5149842 | Process for preparing peroxide perfluoropolyethers A process is disclosed for preparing peroxidic perfluoropolyethers comprising perfluoroalkylenoxy units having at least two carbon atoms, characterized in that one or more perfluoroolefins, except tetrafluoroethylene used alone, are reacted with oxygen in... | 09/22/1992 |
| 5024743 | Methylendioxyphenathrene and stilben derivatives, process for the preparation thereof, pharmaceutical compositions using these, and therapeutic applications The present invention provides compounds of the general formula: ##STR1## where R1 is a hydrogen atom or a methoxy or ethoxy radical and R2 and R3 are hydrogen atoms or R2 and R3 together represe... | 06/18/1991 |
| 5013827 | Enhanced chemiluminescence from 1,2-dioxetanes through energy transfer to tethered fluorescers Triggerable dioxetanes with a fluorescent molecule containing group bonded or tethered in the dioxetane so as to produce fluorescence from the group are described. The compounds are useful in immunoassays and in probes using enzymes or other chemicals for... | 05/07/1991 |
| 4992561 | Simple conversion of artemisinic acid into artemisinin This invention relates to a novel process for producing artemisinin from emisinic acid. The artemisinic acid is reduced to dihydroartemisinic acid by reduction of the exocyclic methylene group. The dihydroartemisinic acid is then oxidized in two successi... | 02/12/1991 |
| 4976834 | Asymmetric photochemical reaction process An optically active substance having an optical purity of at least 50% e.e. is obtained by an asymmetric photochemical reaction by converting a starting, achiral material in a chiral crystalline form and irradiating light to the chiral crystalline form to... | 12/11/1990 |
| 4956477 | Synthesis of 1,2-dioxetanes Compounds having the formula: ##STR1## wherein T is a polycycloalkylidene group (e.g., adamant-2-ylidene); R is a C1-20 alkyl, aralkyl or cycloalkyl group; and Y is a fluorescent chromophore (e.g., m-phenylene), produced by reacting a comp... | 09/11/1990 |
| 4935454 | Broad spectrum light and heat curable sealant composition and method of using same A dielectric composition capable of being polymerized for use in sealing electrical and electro-optical connectors and devices is disclosed. Said composition is comprised of a major proportion of vinyl ester resins, a minor proportion of polymerizable acr... | 06/19/1990 |
| 4886735 | Photopolymerizable recording materials and photoresist layers and lithographic printing plates based thereon Photopolymerizable recording materials suitable for producing photoresist layers and lithographic printing plates are composed of one or more photopolymerizable olefinically unsaturated organic compounds, optionally a polymeric binder, one or more photopo... | 12/12/1989 |
| 4874488 | Photochemical dimerization and functionalization of alkanes, ethers, primary and secondary alcohols, phosphine oxides and silanes The space-time yield and/or the selectivity of the photochemical dimerization of alkanes, ethers, primary and secondary alcohols, phosphine oxides and primary, secondary and tertiary silanes with Hg and U.V. light is enhanced by refluxing the substrate in... | 10/17/1989 |
| 4849076 | Continuous oxidation method A method for oxidizing a substrate which is oxidizable by singlet oxygen is discolded. The first step of the method comprises establishing a flow to and from each of a plurality of successive closed zones, each of which zones (a) contains a quantity of a ... | 07/18/1989 |
| 4845166 | Compositions containing a mixture of a polyhydric alcohol and charge transfer complex of irradiated anhydrides and cyclic ethers, used to cure epoxy resins A curing agent is made by admixing (a) an irradiated mixture of carboxylic acid anhydride and carbon containing cyclic compound and (b) a polyhhydric alcohol, where the curing agent can be added to a resin such as an epoxy resin, applied to the surface of... | 07/04/1989 |
| 4672132 | Process for producing an aldehydelactone A process for producing 3-oxo-6-formyl-2-oxabicyclo[3.3.0]-6-octene useful as an intermediate for producing prostaglandins, via a few steps from raw materials which can be relatively easily prepared. The process comprises subjecting 2,2-dimethyl-1,3-dioxi... | 06/09/1987 |
| 4667050 | Preparation of pyrethroid precursors Substituted vinylcyclopropane carboxylates, useful precursors to pyrethroid insecticides, are prepared by noble metal catalyzed addition of 1-methyl-3-buten-2-yl or 4-methyl-3-penten-1-yl carbonates or carboxylic acid esters to malonic acid diesters, alky... | 05/19/1987 |
| 4571290 | Process for the selective oxidation of olefins with photochemical illumination of semiconductor powder suspensions A process for the selective oxidation of olefins comprises the steps of forming a suspension of semiconductor powder in a solvent media, adding an olefin to the solvent media in the presence of an oxidant to form a mixture and, photochemically activating ... | 02/18/1986 |
| 4568375 | 2-Substituted 5-amino-3-oxo-4-(substituted-phenyl)-2,3-dihydrofuran herbicides 2-Halo and 2-alkoxy-5-amino-3-oxo-4-(substituted-phenyl)-2,3-dihydrofuran and derivatives thereof. The 2-alkoxy and 2-fluoro compounds generally exhibit both pre-emergence and post-emergence phytotoxicity and are useful as herbicides and also at low dosag... | 02/04/1986 |
| 4526986 | Halomethyl, methyl maleic anhydride and synthesis of bromomethyl, methyl maleic anhydride Quaternary ammonium compounds containing anhydride groups are prepared by halogenating dimethylmaleic anhydride and reacting the halogenated product with a tertiary amine. The products are useful as surfactants, biocides and as cosurfactants in enhanced o... | 07/02/1985 |
| 4517125 | Novel vitamin D3 derivatives and process for producing the same There are disclosed 6,19-epidioxyvitamin D3 derivatives which are represented by the formula ##STR1## wherein R1, R2 and R3 are each a hydrogen atom or a hydroxyl group; when R1 is a hydrogen ato... | 05/14/1985 |
| 4508605 | Nonaromatic dianhydride and polyimides from tricyclo[4.2.1.02,5 ] nonane-3,4-dimethyl-3,4,7,8-tetracarboxylic acid dianhydride Novel polyimides and molding compositions are prepared from novel tricyclo[4.2.1.02,5 ] nonane-3,4-dimethyl-3,4,7,8-tetracarboxylic acid dianhydride. The dianhydride is useful for the manufacture of polyimides which are useful as engineering pl... | 04/02/1985 |
| 4507186 | Dianhydrides and polyimides Novel polyimides, copolyimides and molding compositions are prepared from novel dianhydrides such as bicyclo[4.2.0]octane-2,5 diphenyl-7,8-dimethyl,3,4,7,8-tetracarboxylic dianhydride and bicyclo[4.2.0] octane-7,8-dimethyl-3,4,7,8-tetracarboxylic acid ... | 03/26/1985 |