Sumitomo Chemical Company, Limited

Kazunori Iwakura

Hiroshi Souda

Masayoshi Minai

Chizu Sekine

Koichi Fujisawa

Yoshiaki Oda

Masamitsu Ishitobi

Tamio Hayashi

Isao Kurimoto

Tomoyasu Yoshida

Yoshimi Yamada

Fumisato Goto

Makoto Yako

Tohei Takagaki

Yasuhiro Uozumi

A polymer compound having a constitutional unit represented by the following formula (1): 

Polymer compound and light-emitting device using same

There is provided a process for preparing a carboxylic acid ester of formula (3):RCOOR&#x2003;&#x2003;(3)wherein Ris

Process for the preparation of carboxylic acid esters

There are disclosed novel compounds, liquid crystal compositions, polymers, optically anisotropic producgs, and optical or liquid crystal elements that have large refractive index anisotropy, mix easily with other liquid crystals, have advantageous stability against light, and exhibit absorption at practically short wavelength in the ultraviolet region. The compounds are represented by the formula (1) and have a phenylacetylene structure, wherein difference &#x394;E in energy of HOMO of parts (1-1), (1-2) and (1-3) calculated by the method of molecular orbitals is not less than 0.3 electronvolt, and the polarizability anisotropy &#x394;&#x3b1; of a molecule represented by the formula (1) calculated in the same way is not lower than 500 A.U.: P&#x2014;H&#x2003;&#x2003;(1-2)P&#x2014;H&#x2003;&#x2003;(1-3)(Ato A: H, F, alkyl or alkoxy group of C1 to C10 optionally substituted with F; P, P: structure fulfilling the conditions of HOMO energy and polarizability).

Dibenzothiophene oxide compound, and process for producing the same

There is disclosed a process process for producing a cyclopropanecarboxylate of formula (1):which process comprises reacting cyclopropanecarboxylic acid of formula (2):with a monohydroxy compound of formula (3):ROH&#x2003;&#x2003;(3),in the presence of a catalyst compound comprising an element of to Group 4 of the Periodic Table of Elements.

Process for producing cyclopropanecarboxylates

There are disclosed novel compounds, liquid crystal compositions, polymers, optically anisotropic products, and optical or liquid crystal elements that have large refractive index anisotropy, mix easily with other liquid crystals, have advantageous stability against light, and exhibit absorption at practically short wavelength in the ultraviolet region. The compounds are represented by the formula (1) and have a phenylacetylene structure, wherein difference &#x394;E in energy of HOMO of parts (1-1), (1-2) and (1-3) calculated by the method of molecular orbitals is not less than 0.3 electronvolt, and the polarizability anisotropy &#x394;&#x3b1; of a molecule represented by the formula (1) calculated in the same way is not lower than 500 A.U.:(Ato A: H, F, alkyl or alkoxy group of C1 to C10 optionally substituted with F; P, P: structure fulfilling the conditions of HOMO energy and polarizability).

COMPOUND HAVING PHENYLACETYLENE STRUCTURE, LIQUID CRYSTAL COMPOSITION, POLYMER, OPTICALLY ANISOTROPIC PRODUCT, OPTICAL OR LIQUID CRYSTAL ELEMENT, DIBENZOTHIOPHENE COMPOUND, INTERMEDIATE, AND PROCESS FOR PRODUCING THE SAME

Process for racemizing optically active vinyl-substituted cyclopropanecarboxylic acid compound

Method for producing cyclopropanecarboxylates

Phenylacetylene compound, liquid crystal composition, polymer, optically anisotropic product, and liquid crystal or optical element

The present invention provides novel phenylacetylene compounds, liquid crystal compositions having a large refractive index anisotropy (&Dgr;n), and liquid crystal elements produced with the same. The liquid crystal composition contains at least one compound of formula (3A), and at least one compound selected from the group consisting of compounds of any one of formulae (3B) to (3C), wherein A to A : alkyl group optionally substituted with F; R , R : H, F; A to A : H, F; m: 0 or 1; Rings A to D: 1,4-phnylene, 1,4-cyclohexylene; R , R : H, F; Z to Z : &mdash;COO&mdash;, &mdash;OCO&mdash;; b to d: 0 or 1 with b&plus;c&plus;d&square;1; B to B : alkyl or alkoxy group; R , R : H, F:

Phenylacetylene compound, liquid crystal composition, and liquid crystal element produced with the same

Process for producing optically active hemiesters

Methods for producing cyclopropane carboxylates

Producing unsaturated esters by a lanthanide metal alkoxide catalyzed transesterification process

Racemic or optically active threo-3-(3,4-dihydroxyphenyl)serine can be readily produced via a few short steps by a process involving the steps of reacting a racemic or optically active N-acyl DOPA derivative represented by the formula �I!: ##STR1## wherein X is a halogen atom; n is 0, 1, 2 or 3; R.sup.1 and R.sup.2 independently represent a protecting group for a hydroxyl group; R.sup.3 is a protecting group for carboxyl group; R.sup.4 is an alkyl group which may have a substituent or a phenyl group which may have a substituent; and a carbon marked with the symbol * is an asymmetric carbon, with a halogen radical generator, a cerium (IV) salt, or a persulfate salt in the presence of a copper catalyst to produce racemic or optically active oxazolines represented by the formula �IV!: ##STR2## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, X, n and * are as defined above; and thereafter conducting an oxazoline ring opening and removing R.sup.1, R.sup.2 and R.sup.3 and, optionally, removing X when n is 1, 2 or 3.

Process for producing threo-3-(3,4-dihydroxyphenyl)serine

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Ibaraki, Japan

Kazunori Iwakura