7 results about "Alkoxy radical" patented technology

The invention relates to a novel composite bipolar membrane for preparing low-carbon alcohol alkali metal salt and an electrodialysis process of the novel composite bipolar membrane, and belongs to the technical field of membrane separation and electrochemical synthesis. The composite bipolar membrane comprises a cation exchange layer, a middle catalyst layer and an anion exchange layer which are sequentially laminated and compounded, the process comprises the following steps: introducing a salt solution containing alkali metal ions into an anode chamber of a bipolar membrane electrodialysis system, and introducing a low-carbon alcohol solution into a cathode chamber; applying a direct-current electric field to the two sides of the composite bipolar membrane, so that the low-carbon alcohol is dissociated at the membrane interface to generate alkoxy ions and hydrogen ions; the alkoxy ions migrate to an anode chamber to be combined with the alkali metal ions to generate low-carbon alcohol alkali metal salt; the membrane material is high in adaptability, the membrane structure is good in stability, technological parameters are mature, and the system integration degree is high.

A method of providing a deposited metal-containing film by generating an iodine bond-containing metal species in situ with an iodine-containing reagent and a metal-containing precursor at a processing temperature of less than 400 DEG C and followed by reduction. In particular, the film may be a molybdenum-containing film. The method may also include the simultaneous introduction of the reagent with a precursor or optionally a pretreatment with a passivation gas. Also provided are methods of depositing molybdenum-containing films on semiconductors using the low-valent molybdenum-containing precursors. The low valent molybdenum precursor of one or two molybdenum atoms may have at least one ligand that is an isocyano haloalkyl group, an allyl group, an aryl group, a tertiary organic phosphino group, or an alkoxy group.

The present technology provides a curable silicone-based composition comprising a hybrid silicone polymer, a catalyst, and a filler. The present technology provides a curable silicone composition comprising a polymer A comprising an organic molecule or a siloxane molecule comprising an alkoxy radical, a hydroxyl radical, an isocyanate radical, a primary amine, or a carboxylic radical; optionally a polymer B comprising an organic molecule, a siloxane molecule, or a hybrid-siloxane molecule; a catalyst; and a filler.

The present disclosure features materials and methods for the synthesis of polyurethanes by chain-growth copolymerization of a first reactant having an oxirane or thiirane moiety and at least one allene reactant in the presence of a Lewis acid, wherein the first allene reactant is an isocyanate or isothiocyanate. The features also reside in polyurethanes copolymers and terpolymers according to formula (I): (I), wherein An is a halogen atom or a carboxylate or alkoxide moiety; each X and X’ is independently an oxygen or sulfur atom; each R1 and R2 is independently a hydrogen atom or an alkyl group, including straight-chain, branched, saturated, unsaturated, aromatic, cyclic alkyl groups and alkyl groups containing heteroatoms, R3 is an electron-deficient group, m and o are independently selected from integers ≥ 1, and n is 0 or an integer ≥ 1. Both X and X’ can be the same, or X and X’ can be different.

The application relates to a composite bipolar membrane for preparing low-carbon alcohol alkali metal salt and an electrodialysis process thereof, and belongs to the technical field of membrane separation and electrochemical synthesis. The composite bipolar membrane comprises a cation exchange layer, an intermediate catalytic layer and an anion exchange layer which are sequentially laminated in composite. The process comprises the following steps: feeding a salt solution containing alkali metal ions into an anode chamber of a bipolar membrane electrodialysis system, feeding a low-carbon alcohol solution into a cathode chamber; applying a direct current electric field on both sides of the composite bipolar membrane, so that the low-carbon alcohol is dissociated to generate alkoxide ions and hydrogen ions at the membrane interface; the alkoxide ions migrate to the anode chamber and combine with the alkali metal ions to generate low-carbon alcohol alkali metal salt; the membrane material has high adaptability, the membrane structure has good stability, the process parameters are mature, and the system has high integration degree.

To provide curable silicone compositions with desired mechanical and chemical properties.SOLUTION: The present technology provides a curable silicone-based composition comprising a hybrid silicone polymer, a catalyst and a filler. The present technology provides a curable silicone composition comprising a polymer A comprising an organic molecule or a siloxane molecule comprising an alkoxy radical, a hydroxyl radical, an isocyanate radical, a primary amine or a carboxylic radical; optionally a polymer B comprising an organic molecule, a siloxane molecule, or a hybrid-siloxane molecule; a catalyst; and a filler.SELECTED DRAWING: None

The invention discloses a method for monofluoromethoxylation of carbohydrates by regulating the reactivity of alkoxy radicals through a carbohydrate ring, which comprises the following steps: activating a substrate alcohol compound under the condition of no additional oxidant by using metal silver or silver salt as a catalyst and Selectfluor as a fluorine source, so that-OH of the substrate alcohol compound is directly homogenized to generate alkoxy radicals, and the alkoxy radicals are separated to obtain the monofluoromethoxylation of the carbohydrates. And then adjusting the reactivity of the alkoxy free radical through a sugar group so as to generate C-C bond breaking, thereby synthesizing the alpha-monofluoromethoxy substituted carbohydrate compound. According to the method, the reactivity of the alkoxy free radicals is adjusted through sugar ring induction, by means of a monofluoromethoxylation method in glucoside synthesis, the situation that OCH2F free radicals are difficult to prepare and unstable is avoided, and the product can be generated only under the condition that the reaction time is short. The method is simple in operation and controllable in reaction, most importantly, when the reaction is amplified to gram-level reaction, the target product can still be obtained at high yield, further amplification is possible, and potential application value is achieved.