123 results about "Dithiane" patented technology

There are provided a liquid crystalline compound having a large negative Deltaepsilon, low viscosity, a large K33 / K11 value, a small Deltaepsilon / epsilonL and mutually excellent solubility even at extremely low temperature; a liquid crystal composition prepared from a liquid crystalline compound; and a liquid crystal display device fabricated from such a liquid crystal composition. The liquid crystalline compound of the present invention is a liquid crystalline compound represented by the following general formula (1): where, R<1 >represents hydrogen, fluorine, an alkyl group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms; each of rings A<1>, A<2>, and A<3 >independently represents trans-1,4-cyclohexylene group, 1,4-cyclohexenylene group, trans-1,4-silacyclohexylene group, 1,4-phenylenegroup, 2,3-difluoro-1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, pyrimidine-2,5-diyl group, pyridine-2,5-diyl group, 1,3-dioxane-2,5-diyl group, tetrahydropyrane-2,5-diyl group, 1,3-dithiane-2,5-diyl group, or tetrahydrothiopyrane-2,5-diyl group; X<1 >represents hydrogen or fluorine; Y<1 >represents hydrogen or an alkyl group having 1 to 15 carbon atoms; 1 represents an integer from 1 to 10; and each of m and n independently represents 0 or 1.

The present invention discloses non-enantioselective preparation process of emtricitabine. The preparation process includes condensation of glyoxalic acid as the initial material and 2, 5-dihydroxy-1, 4-dithiane under the asymmetric induction of optically active alcohol ester to obtain trans-5-hydroxy-1, 3-oxythiacyclopentane-2-carboxylate; halogenating and coupling with silylated 5-flucytosine, and reducing to obtain initial product; reaction with salicylic acid to form salt, purification and separation to obtain optically pure emtricitabine. The present invention has mild reaction condition, simple operation, low cost, less environmental pollution and high product purity reaching medicinal standard, and is suitable for industrial production. The product is used in treating hepatitis B and AIDS.

The invention features compositions comprising at least one monomer that comprises a cyclic dithiane moiety attached to a (meth)acryloyl moiety. The composition may optionally contain additional polymerizable compounds, such as ethylenically unsaturated compounds, that are typically used in dental compositions.

The invention features compositions comprising at least one monomer that comprises a cyclic dithiane moiety attached to a (meth)acryloyl moiety. The composition may optionally contain additional polymerizable compounds, such as ethylenically unsaturated compounds, that are typically used in dental compositions.

The present invention relates to a benzodithiophene based copolymer containing thieno[3,4-b]thiophene units and a preparing method and applications thereof. The polymer has a structural formula (I), wherein R1 and R2 are respectively selected from H, and alkyl groups of C1 to C16; R3 and R4 are respectively selected from H, alkyl groups of C1 to C16, alkoxy groups of C1 to C16, or thiophene groups substituted by alkyl groups of C1 to C16; R5 is selected from alkyl groups of C1 to C16; n is a natural number from 7 to 80. Applications of the benzodithiophene based copolymer containing thieno[3,4-b]thiophene units in polymer solar cells, polymer organic light-emission, polymer organic field effect transistors, polymer organic optical storage, polymer organic nonlinear materials or polymer organic laser are also provided.

The invention relates to a method for preparing 2,5-dimercapto-methyl-1,4-dithiane, which belongs to the field of optical materials. A reaction formula is as follows: Na2S.9H2O+S->Na2S22CH2=CHCH2Cl+Na2S2->CH2=CHH2-S-S-CH2CH=CH2. The method comprises the following steps of: (1) synthesizing diallyl disulfide; (2) synthesizing 2,5-bis (chloromethyl)-1,4-dithiane; (3) and synthesizing the 2, 5-dimercapto-methyl-1,4-dithiane. The 2,5-dimercapto-methyl-1,4-dithiane provided by the invention is used to prepare novel optical materials, and has refractive indexes with high dispersion and low dispersion. The 2,5-dimercapto-methyl-1,4-dithiane has the advantages of light weight, colorless, transparence and optical distortion, excellent weatherability, dye affinity, heat resistance, impact resistance and machining performance. The method provided by the invention is simple and practicable, and the yield can be up to 65%.

The invention belongs to the field of organic synthesis, and relates to a synthetic method of alkenyl indole derivatives. The alkenyl indole compound has important research value in the aspects of synthesis and pharmaceutical activity, but conventional synthesis steps are tedious, conditions are harsh, and use of expensive heavy metals and positioning groups is involved. The invention provides a synthetic method of the alkenyl indole derivative, which comprises the following steps: by taking an alkenyl-1, 3-dithiane derivative and substituted indole as raw materials, synthesizing the alkenyl indole derivative through migration of a thiane ring under the action of a catalyst. The method is an efficient and simple synthesis method, has the advantages of mild reaction, high efficiency, simplicity in operation and economical raw materials, and has very high practicability.

A pressure-sensitive adhesive composition containing an acrylic copolymer (A) having a structural unit (a1) derived from an alkyl (meth)acrylate (a1)′ and a structural unit (a2) derived from a functional group-containing monomer (a2)′, a crosslinking agent (B), and a photochromic dye (C) selected from a group consisting of dithienylethene-based compounds, oxazine-based compounds and naphthopyran-based compounds has a relatively rapid rate of color change from colored to colorless after termination of irradiation with UV rays, has excellent photochromic performance and can be a pressure-sensitive adhesive layer of a colorless pressure-sensitive adhesive sheet.

The invention relates to a preparation method and application of a coumarin type fluorescent probe; the compound is named as 7-(diethylamino)-3-(1,3-dithiane-2-yl)-2H-pyran-2-one. The compound has small molecular weight, simple structure and quite sensitive effect on Hg<2+>, shows excellent selectivity and sensitivity, is suitable for naked eye detection of Hg<2+>, has the detection limit of 5.0 nM which is the same as the most stringent Hg<2+> measurement standard, and has the potential of in-situ detection. The application of the established method in analysis of environment and seafood samples provides satisfactory results. Therefore, the compound provided by the invention provides a promising method for Hg<2+> detection and stimulates the development of induction of other heavy metal ions and transition metal ions. In a variety of water media, such as water, soil and seafood products, the probe further shows the potential of measuring and managing HTM ions, and has a broad application prospect.