- A polymerizable compound having an unsaturated ring structure
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PROBLEM TO BE SOLVED: To provide a polymerizable compound which does not bring about precipitation of crystals or the like when added to a polymerizable composition, and which has high storage stability, to provide the polymerizable composition containing the polymerizable compound, from which a polymer obtainable by polymerization is produced and the polymer exhibits only slight wavelength and temperature dependence of its phase difference, and in addition to provide the polymer obtained by polymerization of the polymerizable composition and an optically anisotropic body using the polymer.SOLUTION: A compound represented by general formula (I) is provided. Moreover, a polymerizable composition including the compound as a component, a polymer obtained by polymerization of the polymerizable composition, and an optically anisotropic body using the polymer are provided.
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Paragraph 0123; 0124
(2017/01/31)
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- Polymerizable compound, composition, polymer, an optically anisotropic material, an organic EL element and a liquid crystal display element
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An object of the invention is to provide polymerizable compounds having excellent optical characteristics and suited as materials for optically anisotropic articles, compositions containing the polymerizable compounds, polymers obtained by polymerizing th
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Paragraph 0126; 0127
(2016/10/10)
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- Lithium triflate (LiOTf) catalyzed efficient and chemoselective tetrahydropyranylation of alcohols and phenols under mild and neutral reaction conditions
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Different types of alcohols and phenols were effectively converted to the corresponding THP ethers in the presence of DHP and a catalytic amount of lithium trifluoromethanesulfonate (LiOTf) in refluxing 1,2-dichloroethane under essentially neutral reaction conditions. The method also shows good chemoselectivity for mono-tetrahydropyranylation of symmetrical diols.
- Karimi, Babak,Maleki, Jafar
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p. 5353 - 5355
(2007/10/03)
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- Microwave-mediated selective monotetrahydropyranylation of symmetrical diols catalyzed by iodine
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Selective protection of one hydroxyl group as its tetrahydropyranyl ether in 1, n-symmetrical diol is achieved by iodine-catalyzed reaction of the diol with dihydropyranyl ether under microwave irradiation.
- Deka,Sarma
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p. 1947 - 1948
(2007/10/03)
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- Selective monotetrahydropyranylation of symmetrical diols catalyzed by ion-exchange resins
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Primary and secondary symmetrical diols with 2-10 carbon atoms gave selectively monotetrahydropyranyl ethers in the reaction catalyzed by wet sulfonic acid-type ion-exchange resins in 3,4-dihydro-2H-pyran (DHP)/toluene or DHP/hexane. The yields of the monoethers were higher than 80% while those of the corresponding diethers were lower than 5%. In these reactions the rate of the formation of the diethers did not increase much even after most of the diols had been consumed. In the reaction of 1,10-decanediol in DHP/hexane, the yields of the monoether were increased by the addition of DMF or DMSO. Each diol was found to have a particular DHP/hydrocarbon ratio that gave the highest selectivity for the monoether. Generally, the larger the number of carbon atoms of the diols, the smaller the ratio of DHP in the solvents to give high selectivity for the monoether. This method of the selective etherification is quite simple and practical.
- Nishiguchi, Takeshi,Fujisaki, Shizuo,Kuroda, Masahumi,Kajisaki, Kohtaro,Saitoh, Masahiko
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p. 8183 - 8187
(2007/10/03)
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- Intramolecular Cyclization of 4-[3-(Trimethylsilyl)prop-1-en-1-yI]-cyclohexanecarbaldehyde with Loss of Formyl Carbon
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Treatment of cis- and trans-4-[3-(trimethylsilyl)prop-1-en-1-yl]cydohexanecarbaldehyde (2a and 2b) with tetrabutylammonium fluoride in dilute tetrahydrofuran afforded 7-vinylbicyclo(2.2.1]heptan-1-ol (3), the same product obtained from 4-[3-(trimethylsilyl)prop-1-en-1-yl]cyclohexanone (1). It was found that oxidative deformyhition of 2a, b to 1 takes place under basic conditions before the cyclization to 3. It was also shown that cyclization of allylsilane with carbonyl does not proceed via an eclipsed conformation.
- Kuroda, Chiaki,Murase, Atsushi,Suzuki, Hideyuki,Endo, Toru,Anzai, Shuzo
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p. 1639 - 1647
(2007/10/03)
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- Highly Selective Monotetrahydropyranylation of Symmetrical Diols Catalysed by a Strongly Acidic Ion-exchange Resin
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Several primary and secondary symmetrical diols, ranging from propane-1,3-diol to decane-1,10-diol, are selectively monoprotected by monotetrahydropyranyl ether formation catalysed by a strongly acidic ion-exchange resin (Dowex 50x x 2, 50-100 mesh) in a 3,4-dihydro-2H-pyran-hydrocarbon mixture.
- Nishiguchi, Takeshi,Kuroda, Masahumi,Saitoh, Masahiko,Nishida, Akiko,Fujisaki, Shizuo
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p. 2491 - 2492
(2007/10/03)
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- Highly Selective Monoetherification of Symmetrical Diols Catalysed by Metallic Sulfate Supported on Silica Gel
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Several symmetrical primary and secondary diols from C2 to C16 have been protected in high selectivity by tetrahydropyranyl ether formation catalysed by metallic sulfates supported on silical gel.This selective etherification is simple and practical.The s
- Nishiguchi, Takeshi,Kawamine, Katsumi,Ohtsuka, Tomoko
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p. 153 - 156
(2007/10/02)
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