- Method For Producing Acyloxy Benzoic Acids
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The invention relates to a method for producing acyloxy benzoic acids of the formula (I), in which R1 is a linear or branched saturated alkyl group with 6 to 30 carbon atoms, a linear or branched mono- or polyunsaturated alkenyl group with 6 to 30 carbon atoms, or an aryl group with 6 to 30 carbon atoms. The acyloxy benzoic acids of the formula (I) are produced from para-hydroxy benzoic acid and a corresponding carboxylic acid halide in the presence of an alkali hydroxide.
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Paragraph 0052
(2013/08/28)
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- Method For Producing Acyloxy Benzoic Acids
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The invention relates to a method for producing acyloxy benzoic acids of the formula (I), in which R1 is a linear or branched saturated alkyl group with 6 to 30 carbon atoms, a linear or branched mono- or polyunsaturated alkenyl group with 6 to 30 carbon atoms, or an aryl group with 6 to 30 carbon atoms. The acyloxy benzoic acids of the formula (I) are produced from para-hydroxy benzoic acid and a corresponding carboxylic acid halogenide in the presence of a base and are advantageously suitable for use as activators for hydrogen peroxide.
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Paragraph 0052
(2013/08/28)
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- Swallow-tailed compound and ferrielectric liquid crystal composition containing the same
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A swallow-tailed compound of the following general formula (1), STR1 wherein m is an integer of 4 to 10, n is an integer of 2 to 6, p is 0 or 1 and each of X and Y is independently a hydrogen or fluorine atom; and a ferrielectric liquid crystal composition consisting essentially of the swallow-tailed compound of the general formula (1) and a ferrielectric liquid crystal compound of the following general formula (2), STR2 wherein R is a linear alkyl group having 6 to 12 carbon atoms, Z is a hydrogen or fluorine atom, r is an integer of 2 to 4 and s is an integer of 2 to 4. The ferrielectric liquid crystal composition has a ferrielectric phase in a broad temperature range and attains a fast response and a large tilt angle in a broad temperature range so that a ferrielectric liquid crystal display device having high display qualities can be provided.
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- Racemic compound and anti-ferroelectric liquid crystal composition
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A racemic compound of the formula (1) and an anti-ferroelectric liquid crystal composition consisting essentially of said racemic compound and one anti-ferroelectric liquid crystal compound of the formula (2) or a mixture of two or more compounds selected
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- Anti-ferroelectric liquid crystal compound and anti-ferroelectric liquid crystal composition
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An anti-ferroelectric liquid crystal compound of the following general formula (1), and an anti-ferroelectric liquid crystal composition containing it, STR1 wherein R is a linear alkyl group, A is --O-- or --COO--, m is an integer of 5 or greater, n is an integer of 1 to 3, each of X and Y is independently a hydrogen atom or a fluorine atom, and C* is asymmetric carbon.
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- Liquid crystal compounds
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The invention discloses optically active liquid crystal compounds represented by the formulas [I], [II] and [III]: STR1 wherein R1 and R2 each represents an alkyl group of 4-18 carbon atoms, X represents O, COO or a single bond, and (A), (B), (C), (D) and (E) each represents STR2 in which l represents a halogen. The invention further discloses optically active liquid crystal compounds which are able to exhibit tristable states, represented by the formulas [IV], [V] and [VI]: STR3 wherein R1 ' and R2 ' each represents a straight chain alkyl group of 5-16 carbon atoms, X' represents O or COO and (A), (B), (C), (D) and (E), and l each has the same meaning as above.
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- The Effect of Carbonyl Containing Terminal Chains on Mesomorphic Properties in 4,4'-Disubstituted Phenylbenzoates and Thiobenzoates 8. Phenylbenzoates Containing Two Carbonyl Containing Terminal Chains
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A variety of phenylbenzoates of the type (1) with both X and Y being the carbonyl containing chains (CH2)nCOR (n = 0 - 1), (CH2)nCO2R and (CH2)nOCOR (R = alkyl chain) in various combinations were synthesized and their mesomorphic properties studied to determine if an additive effect occurs when these chains are incorporated into the same molecule.No reliable additive effect could be found.Instead, clearing temperatures often seemed to be closer to the clearing temperature of the parent single carbonyl containing chain ester with the higher clearing temperature.An attempt was also made to improve the properties of the esters 1 with X or Y being I, F, CN or NO2 by using a carbonyl containing chain as the second substituent and assuming an additive effect.However, such an effect was also not observed in these esters.Smectic C phases were found in some of the esters with X = CN which is rare for compounds containing this substituent. - Keywords: liquid crystals, phenylbenzoates, synthesis, NMR, esters, ketones
- Neubert, M. E.,Keast, S. S.,Ezenyilimba, M. C.,Greer, P. B.,Jones, W. C.,et al.
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- Liquid crystal compound
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Liquid crystal compound of the formula STR1 wherein R1 and R2 each is a C1-18 alkyl group or an aralkyl group, R' is a haloalkyl group, X is --0--, --CO--, --COO-- or direct bond, Y is --COO--, --OCO-- or --CH2 O--, (A) and (B) each is STR2 and p and l each is zero or one.
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- Alkanoyl ester compounds and their intermediates and method of producing the same
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This invention provides a novel alkanoyl ester compound represented by general formula (I): STR1 (wherein A is of --, --O--, STR2 B is STR3 l and m are 1 or 2 provided that both are not simultaneously 2, k and n are an integer of 1 or more, respectively, provided that k>n, and R is an alkyl group), a liquid crystal composition containing this compound, a novel alkanoylphenyl compound or a novel alkanoylbiphenyl compound as an intermediate for the production of the above compound, and a method of producing the same. These novel alkanoyl ester compounds are excellent in the stability against light and the like and can take a liquid crystal state at a wide temperature range. Particularly, these compounds form liquid crystals of ferroelectricity having a large spontaneous polarization and a fast response rate by introducing an optically active group into the compound, so that they develop a very excellent effect as a starting material for optoelectronics and its related elements.
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- Novel halogen-containing ester compounds, and their intermediates, and method of producing the same as well as liquid crystal compositions containing the same and light switching elements
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This invention provides a novel halogen-containing ester compound represented by the following general formula (I): STR1 (wherein R is an alkyl group, A is selected from a single bond, --O--, --COO-- and --CO--, both of X and Y are halogen atoms or either one of X and Y is a halogen atom and the other is a hydrogen atom, each of m and n is 0 or 1, m+n=0 or 1, each of k and l is an integer of 1 or more, provide kl), a liquid crystal composition and a light switching element each containing the above compound as well as a novel fluorophenol compound represented by the following general formula (II): STR2 (wherein each of k and l is an integer of 1 or more, provided kl) as an intermediate for the synthesis of the above ester compound and a method of producing the same.
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- The Effect of Carbonyl Containing Substituents in the Terminal Chains on Mesomorphic Properties in Some Aromatic Esters and Thioesters. 3. Acyloxy Groups on the Acid End
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A select number of 4-alkyl and alkoxyphenyl-4'-acyloxybenzoates and phenylthiobenzoates of the type where X = RCO2, Y = R' or OR', and Z = O or S have been prepared and their mesomorphic properties determined by hot-stage polarizing microscopy.T
- Neubert, Mary E.,Colby, Cynthia,Ezenyilimba, Matthew C.,Jirousek, Michael R.,Leonhardt, Darrin,Leung, Katherine
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p. 127 - 150
(2007/10/02)
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