TRICYCLIC PHENYLPYRIDINE DERIVATIVE AND LIQUID CRYSTAL COMPOSITION CONTAINING THE SAME

    公开(公告)号:JP2000247956A

    公开(公告)日:2000-09-12

    申请号:JP5052599

    申请日:1999-02-26

    Abstract: PROBLEM TO BE SOLVED: To obtain a new tricyclic phenylpyridine derivative which is useful as a component for practically excellent liquid crystals responding at high speeds in wide temperature ranges, has alkyl side chains not having oxygen functional groups, and contains a pyridine ring. SOLUTION: A tricyclic phenylpyridine derivative of formula I (R1 is a 1-12C alkyl; R2 is a 1-12C alkyl or H; ring A and ring B are each 1,4-phenylene, pyridin-2,5-diyl, provided that the ring B is 1,4-phenylene, when the ring A is pyridin-2,5-diyl). For example, 2-(4decylphenyl)-5-(4-octylphenyl)pyridine. The compound of formula I is obtained, for example, by reacting an alkylbromobenzene of formula II with buthyllithium or the like to form the lithio compound, reacting the lithio compound with trimethyl borate, reacting the obtained borate derivative with 2,5-dibromopyridine in the presence of a palladium catalyst, and then reacting the obtained bromophenylpyridine derivative with a Grignard reagent in the presence of a nickel catalyst.

    METHOD FOR PRODUCING SILYL ENOL ETHER FROM DISILYL ACETAL

    公开(公告)号:JP2003212883A

    公开(公告)日:2003-07-30

    申请号:JP2002012973

    申请日:2002-01-22

    Abstract: PROBLEM TO BE SOLVED: To provide a simple and highly versatile method for producing a silyl enol ether as a compound useful as an intermediate in organic synthesis. SOLUTION: This method for producing the silyl enol ether of the general formula: RCH=CH(OSiR 1 R 2 R 3 ) comprises reacting the corresponding disilyl acetal of the general formula: RCH 2 CH(OSiR 1 R 2 R 3 ) 2 in the presence of a transition metal catalyst. COPYRIGHT: (C)2003,JPO

    METHOD FOR PRODUCING DISILYL ACETAL AND ALDEHYDE

    公开(公告)号:JP2003155258A

    公开(公告)日:2003-05-27

    申请号:JP2002012968

    申请日:2002-01-22

    Abstract: PROBLEM TO BE SOLVED: To provide a method for producing disilyl acetals and aldehydes useful as an intermediate for an organic synthesis. SOLUTION: This method for producing the disilyl acetals expressed by the general formula RCH(OSiR R R )2 or RCH(OSiR R R )(OSiR R R ) is provided by performing a reaction of a carboxylic acid expressed by the general formula: RCOOH or a carboxylic acid silyl ester expressed by the general formula: RCOOSiR R R with a hydrosilane expressed by the general formula: HSiR R R in the presence of a ruthenium catalyst. The method for producing the aldehydes expressed by the general formula: RCHO is characterized by performing a reaction of the disilyl acetals in the presence of a transition metal catalyst.

    PRODUCTION OF OPTICALLY ACTIVE BETA-AMINOKETONES AND OPTICALLY ACTIVE PALLADIUM BINUCLEAR COMPLEX AND ITS PRODUCTION

    公开(公告)号:JPH11302236A

    公开(公告)日:1999-11-02

    申请号:JP20881998

    申请日:1998-07-24

    Abstract: PROBLEM TO BE SOLVED: To efficiently synthesize the subject compounds useful as an intermediate for producing medicines, etc., by reacting a silyl enol ether with an imine in the presence of a specific catalyst. SOLUTION: A silyl enol ether represented by formula I [R is a substituted silyl; R is a (substituted) alkyl, a (substitute) alkenyl or the like; R and R are each H, a (substituted) alkyl, a (substituted) alkenyl or the like] is reacted with an imine represented by formula II [R is a (substituted) alkyl, a (substituted) alkenyl or the like; R is H, a (substituted) alkyl, a (substituted) alkenyl or the like] in the presence of a catalyst comprising a palladium- optically active phosphine ligand to afford the objective compounds represented by formula III. In the above reaction, e.g. N,N-dimethylformamide is preferably used as a solvent and the reaction is preferably carried out in the presence of a base such as calcium carbonate at a reactional temperature within the range of ambient temperature to 70 deg.C.

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