Otsuka Kagaku Kabushiki Kaisha

Sumitomo Chemical Company, Limited

Tosoh Corporation

Takasago International Corporation

Akira Miyashita

Hiroyuki Nohira

Hidemasa Takaya

Akio Imai

Kenji Nagaoka

Hidenori Hanaoka

Katsuji Ueno

Hiroaki Katayama

Tsuyoshi Watanabe

Yoshiaki Oda

Masaaki Nabika

Norio Kawamura

Takeshi Chiba

Hirofumi Johohji

Satoshi Ebisu

The present invention relates to a transition metal complex, a process for producing the same, a polymerization catalsyt containing the transition metal complex and a process for producing polymers which uses the catalysts.

Transition metal complex, process for producing the same, olefin polymerization catalyst containing the transition metal complex and process for producing olefin polymers

Transition metal complex, catalyst for olefin polymerization, and

The present invention provides a novel transition metal complex which catalyzes asymmetric hydrogenation reaction. The present invention also provides a process for the preparation of the foregoing novel complex. The present invention further provides an asymmetric hydrogenation catalyst comprising the foregoing novel complex. The novel transition metal complex is provided, represented by the following general formula (I): ##STR1##

Transition metal complex, process for the preparation of the same, and

Spiropyran compounds and optically active spiropyran compounds and their

The object of the invention is to provide a novel compound suited for use as a thermochromic and photochromic material. The invention relates to an indolinospirobenzopyran derivative of the general formula ##STR1## [wherein R.sup.1 stands for C.sub.1-20 alkyl, aralkyl, methacryloxymethyl or methacryloxyethyl; R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 may for example be hydrogen; R.sup.8 may for example be hydrogen or methacryloxymethyl; Y may for example be oxygen or sulfur] and a process for producing the derivative.

Crystals consisting of an indolinospirobenzopyran derivative

A catalyst for polymerizing an aromatic vinyl compound is provided which is composed of a catalyst component (A) and a catalyst component (B); the catalyst component (A) being a reaction product derived by reacting an organic transition metal compound having a substituted or unsubstituted cyclopentadienyl group, with an alkylaluminum compound, and represented by the general formula (I): ##STR1## where C.sub.5 R.sup.1.sub.m is a substituted or unsubstituted cyclopentadienyl group: R is hydrogen or a hydrocarbon group having 1 to 20 carbons, each R.sub.1 being independent; R.sup.2 is an alkylene group having 1 to 4 carbons, a dialkylsilicon group, a dialkylgermanium group, an alkylphoshine group, or an alkylamine group, the alkylene or alkyl group, and R.sup.2 crosslinks the two (C.sub.5 R.sup.1.sub.m) rings; m is an integer of 0 to 5; n is 0 or 1; when n=0, m=5, Q is an alkyl group or a halogen atom; R.sup.3 is a hydrocarbon group having 1 to 18 carbons; and M is a metal of Group IVB of Periodic Table; and the catalyst component (B) being an aluminoxane represented by the general formula (II) or (III): ##STR2## where p is an integer of 4 to 30, and R.sup.4 is a hydrocarbon group. A process for producing a polymer of an aromatic vinyl compound is also provided which comprises polymerizing the aromatic vinyl compound in the presence of the catalyst specified above.

Catalyst for polymerizing aromatic vinyl compound and process for

Crystal comprising an indolinospirobenzothiopyran derivative and its

Transition metal-spirobenzopyran complex, a production process therefor

The present invention provides a spiropyran compound represented by the formula ##STR1## wherein R.sup.1 is alkyl having 1 to 20 carbon atoms or aralkyl, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are the same or different and are each a hydrogen atom, alkyl having 1 to 6 carbon atoms, aryl or aralkyl, alkoxyl having 1 to 5 carbon atoms, halogen atom, cyano, trichloromethyl, trifluoromethyl or nitro, R.sup.6 and R.sup.7 are the same or different and are each a hydrogen atom, alkyl having 1 to 6 carbon atoms, aryl or aralkyl, halogen atom, cyano or nitro, X is an oxygen atom or sulfur atom, Y is Se or (CH.sub.3).sub.2 C&lt;, Z is ##STR2## and X is a sulfur atom when Y is (CH.sub.3).sub.2 C&lt;. The spiropyran compound of the present invention itself is usable as a material such as recording material, photosensitive material, optical filter or decorative material. The present compound can further be homopolymerized or copolymerized with other polymerizable compound into a high polymer spiropyran compound for application to optical devices or dynamic devices.

Spiropyran compounds

Macromolecular spiropyran compounds

Benzoselenazolino-vinylspiropyran compound

A catalyst for polymerizing an aromatic vinyl compound, having the formula (I): ##STR1## where M is an element of Group IVa; X.sup.1 is a halogen; R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are independently hydrogen or an alkyl group having 1 to 6 carbon atoms; R.sup.8 is hydrogen or an alkyl group having 1 to 5 carbon atoms; m is an integer of from 1 to 6; and n is an integer of from 4 to 60. The vinyl polymer produced has predominantly a syndiotactic structure.

Process for polymerizing an aromatic vinyl compound and a catalyst

A catalyst for polymerizing an aromatic vinyl compound, comprising a transition metal compound as a catalyst component (A) represented by the general formula ##STR1## where M is an element of Group IVb of the Periodic Table of Elements; X.sup.1 and X.sup.2 are respectively halogen; R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are respectively hydrogen or an alkyl group of from 1 to 6 carbons; and m is an integer of 1 to 6; and an aluminoxane as a catalyst component (B) represented by the general formula (2) or (3): ##STR2## where n is an integer of from 4 to 60; and R.sup.7 is an alkyl of from 1 to 6 carbons, phenyl or benzyl, preferably methyl, and a process for producing a polymer of an aromatic vinyl compound, comprising polymerizing the aromatic vinyl compound in the presence of the catalyst.

Process for producing syndiotactic polymer of aromatic vinyl compounds

A process for producing a carboxylic acid or an ester thereof represented by formula (I): ##STR1## wherein: R represents a hydrogen atom or a lower alkyl group; R.sup.1 represents a lower alkyl group; CH.sub.2 COOR.sup.3, wherein R.sup.3 represents a hydrogen atom or a lower alkyl group; or NHR.sup.4, wherein R.sup.4 represents a formyl group, an acetyl group, a benzoyl group, or a chloroacetyl group, and

Process for producing carboxylic acids and esters thereof

A ruthenium-optically active phosphine complex having, as a ligand, BICHEP which means 2,2'-bis(dicyclohexylphosphino)-6,6'-dimethyl-1,1'-biphenyl represented by formula (I): ##STR1## is disclosed, which can catalyze asymmetric syntheses, such as asymmetric hydrogenation, asymmetric isomerization, and asymmetric silylation, exhibiting excellent catalytic activity and providing high optical purity.

Growing community of inventors

Ageo, Japan

Akira Miyashita