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    METHOD FOR PRODUCING TETRAFLUOROBENZENEDIMETHANOL
    3.
    发明专利
    METHOD FOR PRODUCING TETRAFLUOROBENZENEDIMETHANOL 失效

    公开(公告)号：JP2001158754A

    公开(公告)日：2001-06-12

    申请号：JP34016399

    申请日：1999-11-30

    申请人： SHOWA DENKO KK

    发明人： MIYATA HIDEO ,  MORIKAWA KOHEI

    IPC分类号： B01J23/755 ,  C07B61/00 ,  C07C29/141 ,  C07C33/46 ,  C07C45/44 ,  C07C47/55

    摘要： PROBLEM TO BE SOLVED: To provide a method for industrially usefully producing tetrafluorobenzenedimetanol or tetrafluorobenzenedicarbaldehyde useful as a raw material, intermediate, etc., for agrochemicals, medicines, etc. SOLUTION: Tetrafluorodicyanobenzene is reduced with hydrogen in the presence of water and an acid by using one or more kinds of metals selected from a group consisting of nickel, palladium, platinum, ruthenium and cobalt as a catalyst to provide tetrafluorobenzenedicarbaldehyde, which is then reduced to produce tetrafluorobenzenedimethanol.

    NOVEL C-AROMATAXOL HOMOLOGUES, SYNTHETIC INTERMEDIATE AND PRODUCTION PROCESS THEREOF
    7.
    发明专利
    NOVEL C-AROMATAXOL HOMOLOGUES, SYNTHETIC INTERMEDIATE AND PRODUCTION PROCESS THEREOF 失效

    公开(公告)号：JPH07304704A

    公开(公告)日：1995-11-21

    申请号：JP27047394

    申请日：1994-10-07

    申请人： KURARAY CO

    发明人： TAKAHASHI TAKASHI ,  NAGASHIMA KENSUKE

    IPC分类号： C07C45/44 ,  C07C47/457 ,  C07C47/46 ,  C07C47/47 ,  C07C47/55 ,  C07C47/57 ,  C07C47/575 ,  C07C49/675 ,  C07C49/747 ,  C07C49/753 ,  C07F7/18

    摘要： PURPOSE:To provide a simplified synthetic method for a novel C-aromataxol homologues utilizing intramolecular ring closure reaction through relatively reduced process steps without protecting the hydroxyl group in ring B by (methoxy)methyl etherification. CONSTITUTION:A C-aromataxol homologue of formula I or II (R is OH, an alkyl, an alkoxy, ethoxyethyloxy, an alkanoyloxy, an aryl, an aryloxy or an aralkoxy) and a novel synthetic intermediate of formula III (X is a halogen) or formula IV (R is an acyl). The compound of formula I (R is OH) is prepared by effecting Friedel-Craft type condensation reaction of o-chloromethyl- benzoyl chloride of formula IV with geranyl acetate of formula VII in the presence of a Lewis acid, then ring closure reaction of the product at the ring A into corresponding compound of formula V (X is Cl; R is acetyl), conversion of the compound of formula V into the corresponding compound of formula III, then subjecting the compound to the cyclization reaction with cyanohydrin.