中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

27 records (took 0.022 seconds)

    PROCESS FOR THE PREPARATION OF POLY-UNSATURATED KETONES
    11.
    发明专利
    PROCESS FOR THE PREPARATION OF POLY-UNSATURATED KETONES 未知

    公开(公告)号：DE3260082D1

    公开(公告)日：1984-05-03

    申请号：DE3260082

    申请日：1982-03-31

    Applicant: BASF AG

    Inventor： JANITSCHKE LOTHAR DR ,  HOFFMANN WERNER DR ,  ARNOLD LOTHAR DR ,  STROEZEL MANFRED ,  SCHEIPER HANS-JUERGEN

    IPC: C07C45/00 ,  C07C45/74 ,  C07C49/203 ,  C07C67/00

    Abstract: An improved process for the preparation of unsaturated ketones of the general formula I (I) where R1 is -CH3, and R2 and R3 are different and each is H or -CH3, by reacting an aldehyde of the general formula II (II) with a molar excess of acetone or methyl ethyl ketone at an elevated temperature in the presence of an aqueous alkali metal hydroxide solution, wherein (a) all the reactants are mixed thoroughly, (b) the temperature is kept at from 10 to 120 DEG C. above the boiling point of the lowest-boiling component and (c) the pressure is kept at from p to 100 bar, where p is the vapor pressure of the mixture at the reaction temperature. The products methylpseudoionone, dimethylpseudoionone, pseudoirone, methylpseudoirone and dimethylpseudoirone are useful scents and scent intermediates. In addition, pseudoionone is an important intermediate for the industrial preparation of vitamin A, and 6-methyl-hepta-3,5-dien-2-one is a sought-after aromatic.

    15.
    发明专利
    未知

    公开(公告)号：DE3636057C1

    公开(公告)日：1988-01-07

    申请号：DE3636057

    申请日：1986-10-23

    Applicant: BASF AG

    Inventor： TAVS PETER DR ,  LAAS HARALD DR ,  SCHAUER HORST ,  ARNOLD LOTHAR DR

    IPC: C07C45/74 ,  C07C45/78 ,  C07C45/82 ,  C07C45/85 ,  C07C49/603 ,  C07C45/72

    Abstract: The yield of 2,5,6-trimethyl-cyclohex-2-en-1-one is increased by reacting diethyl ketyone, in the presence of an alkali, with crotonaldehyde or a compound which is converted to crotonaldehyde under the reaction conditions chose, and working up the reaction mixture by distillation, by a method in which the distillation residue obtained is either (a) heated at from 120 DEG to 250 DEG C. in particular from 120 DEG to 200 DEG C., with the addition of a catalytic amount of an alkali, or (b) heated at from 150 DEG to 250 DEG C. without the addition of such a substance, and the mixture of 2,5,6-trimethylcyclohex-2-en-1-one and diethyl ketone which is formed from the distillation residue as a result of the heat treatment is separated by distillation.

Patent Agency Ranking