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7556750 Photochromic materials with reactive substituents  
Various non-limiting embodiments of the present disclosure relate to photochromic materials comprising a reactive substituent. For example, the present disclosure contemplates photochromic...
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...
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...
6863782 Method of preparing di(ketene acetals)  
Di(ketene acetals) are prepared by photoisomerizing the corresponding di(vinyl acetals).
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.
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...
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...
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...
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...
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 C 3 H 3 XO 3 (I) in which X is Cl or Br, characterized in that the...
6180805 Photochemical process for the production of previtamin D3  
A photochemical process for the production of previtamin D 3 or a derivative thereof from 7-dehydrocholesterol is disclosed. The process includes irradiating the 7-dehydrocholesterol in a reactor...
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...
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...
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...
5484932 Halogenation processes in advantageous solvents, and novel bistrifluoromethyl-polyfluoroalkoxybenzenes  
Compounds such as ##STR1## wherein R is F, CF 3 , CF 2 H, CHF CF 3 or CF 2 CF 3 , as well as related compounds containing chlorine, are used as solvents in halogenation processes.
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...
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...
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-CH 2 -CO-CH 2 -CH 2 -COOH, in which R stands for methyl, ethyl,...
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.
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.
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...
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 R 1 is a hydrogen atom or a methoxy or ethoxy radical and R 2 and R 3 are hydrogen atoms or R 2 and R 3 together...
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...
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...
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 C 1 -20 alkyl, aralkyl or cycloalkyl group; and Y is a fluorescent chromophore...
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...
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...
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...
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...
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...
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...
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...
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...
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-dihydrofur an and derivatives thereof. The 2-alkoxy and 2-fluoro compounds generally exhibit both pre-emergence and post-emergence...
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...
4517125 Novel vitamin D.sub.3 derivatives and process for producing the same  
There are disclosed 6,19-epidioxyvitamin D 3 derivatives which are represented by the formula ##STR1## wherein R 1 , R 2 and R 3 are each a hydrogen atom or a hydroxyl group; when R 1 is a...
4508605 Nonaromatic dianhydride and polyimides from tricyclo[4.2.1.0.sup.2,5 ] nonane-3,4-dimethyl-3,4,7,8-tetracarboxylic acid dianhydride  
Novel polyimides and molding compositions are prepared from novel tricyclo[4.2.1.0 2 ,5 ] nonane-3,4-dimethyl-3,4,7,8-tetracarboxylic acid dianhydride. The dianhydride is useful for the manufacture...
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...
4490545 Cyclic dianhydrides prepared from maleic anhydride  
Cyclic dianhydrides and polyimides are prepared from maleic anhydride compounds and diolefins. The diolefins are alpha-, omega-linear diolefins of up to 100 carbon atoms or cyclic diolefins of up...
4481092 Photo-initiated epoxidation of allyl chloride  
Epichlorohydrin is prepared by the epoxidation of allyl chloride by a process which comprises irradiating an oxygen-saturated solution of allyl chloride in an aprotic solvent in the presence of an...
4466870 Organic sonochemistry process  
The method of causing or promoting chemical changes involving the step of subjecting reactants to ultrasonic energy as a key treatment step, including methods of: (1) reducing aryl halides by...
4428806 Process for producing brominated 1,3-dioxolen-2-ones  
A process for producing a brominated 1,3-dioxolen-2-one of the following general formula (I) ##STR1## wherein R 1 represents a hydrogen atom, a methyl group, or an aryl group, and R 2 represents...
4411753 Synthesis of 6-t-alkyl-3-pyridazinones  
A class of 6-t-alkyl-3-pyridazinones are prepared from 3-t-alkanoyl-2-propenoic acids by irradiation with strong light and reaction with hydrazine.
4398033 4-Chloro-4-chloromethyloxetan-2-one and a process for its production  
The new compound 4-chloro-4-chloromethyloxetan-2-one can be prepared by reacting diketene with sulphuryl chloride under conditions in which free radicals are formed. The...
4383904 Photochemical epoxidation  
This invention provides a process for photochemical epoxidation of olefins with molecular oxygen in a liquid phase with irradiation in the presence of a combination of 1,2-diketone...
4363923 4-Halgeno-oxetan-2-ones and process for their production  
Novel compounds having the formula I ##STR1## are described wherein X is a chlorine, bromine or iodine atom and Y is a residue having the formula R 1 R 2 R 3 C- wherein R 1 and R 2 are the...
4349481 Tritiated gibberellin aldehydes  
Is the objective of the invention to develop a process for the production of tagged gibberellin-(7)-aldehydes which is of general applicability. As per the invention a gibberellin-(7)-aldehyde is...
4344884 Process for producing cis-3-(2,2-disubstituted-ethenyl)-2,2-dimethylcyclopropanecarboxylic acid and intermediates  
Novel intermediates for production of insecticidal cis-3-(2,2-disubstituted-ethenyl)-2,2-dimethylcyclopropaneca rboxylates, processes for preparing the intermediates, and processes for preparing...
4342694 Processes for producing pyrethroid insecticide intermediates  
Processes for producing a (1α, 4α, 5α)-6,6-dimethyl-4-halo-substituted-methyl-3-oxabicyclo[3.1 .0]hexan- 2-one and its novel intermediates from known and inexpensive starting materials are...
4324725 Preparation of 5-(2,2-dihalovinyl)-4,4-dialkyl-tetrahydro-furan-2-ones  
Preparation of 5-(2,2-dihalovinyl)-4,4-dialkyl-tetrahydro-furan-2-ones of the formula I ##STR1## where R 1 and R 2 are each alkyl of 1 to 4 carbon atoms and X is halogen, by reacting a carboxylic...
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