Document Type and Number:
Japanese Patent JPS5143752
Kind Code:
A
Abstract:
1457499 Anthraquinone BAYER AG 22 May 1975 [2 Aug 1974] 22270/75 Heading C2C An anthraquinone is prepared by reacting a 1,4-naphthoquinone with trans-1-acetoxybutadiene in a polar solvent at from 30 to 60 C., optionally in the presence of acetic acid, to give 1 - acetoxy - 1,4,4a,9a - tetrahydroanthraquinone and treating the reaction solution thus obtained with oxygen at from 100 to 130 C. without isolation of the 1-acetoxy-1,4,- 4a,9a-tetrahydroanthraquinone, optionally after the addition of a salt of acetic acid or of a compound which forms an acetic acid salt under the reaction conditions. The first stage of the reaction is preferably carried out in the absence of oxygen.
Inventors:
HERUMAN ETEIGAA
Application Number:
JP9263175A
Publication Date:
April 14, 1976
Filing Date:
July 31, 1975
Export Citation:
Assignee:
BAYER AG
International Classes:
C07C69/157; C07C46/02; (IPC1-7): C07C49/68