公开(公告)号：DE3114071A1

公开(公告)日：1982-10-28

申请号：DE3114071

申请日：1981-04-08

Applicant: BASF AG

Inventor： JANITSCHKE LOTHAR DIPL CHEM DR ,  HOFFMANN WERNER DIPL CHEM DR ,  ARNOLD LOTHAR DIPL CHEM DR ,  STROEZEL MANFRED ING GRAD ,  SCHEIPER HANS-JUERGEN ING GRAD

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.

公开(公告)号：DE2502167A1

公开(公告)日：1976-07-22

申请号：DE2502167

申请日：1975-01-21

Applicant: BASF AG

Inventor： HANNEBAUM HEINZ ,  FRANCKE DIETHARD ,  NOHE HEINZ DIPL CHEM DR ,  BECK FRITZ DIPL CHEM DR ,  STROEZEL MANFRED ING GRAD

IPC: C25B3/29 ,  C25B9/17 ,  C25B9/00

Abstract: An electrochemical cell with a nonpartitioned electrolyte chamber and plane electrodes, which form a stack, the chamber filled by the electrolyte forming narrow gaps between the electrodes, and the electrode stack being assembled on a fixed baseplate so that its axis is essentially vertical.