PUB-NO: DE003207937C1
DOCUMENT-IDENTIFIER: DE 3207937 C1
TITLE: Process for the preparation of 4-alkoxyphenols
PUBN-DATE: May 19, 1983
ASSIGNEE-INFORMATION:
APPL-NO: DE03207937
APPL-DATE: March 5, 1982
PRIORITY-DATA: DE03207937A (March 5, 1982)
INT-CL_(IPC): C07C041/09
EUR-CL (EPC): C07C041/09
US-CL-CURRENT: 568/650
ABSTRACT:
A novel process for the preparation of 4-alkoxyphenols by reacting hydroquinone with an alcohol at increased temperatures in the presence of catalytic amounts of benzoquinone and an acid is characterised in that perchloric acid is used as the acid. This process gives 4-alkoxyphenols in high yields. 4-Alkoxyphenols are valuable intermediates, for example for the preparation of 4-alkoxyphenyl
carboxylates, which are used as liquid-crystalline compounds.
Patent DE3207937
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PUB-NO: EP000039484A1
DOCUMENT-IDENTIFIER: EP 39484 A1
TITLE: Process for the production of monoethers of hydroquinone and quinol ketales as intermediates thereof.
PUBN-DATE: November 11, 1981
INVENTOR-INFORMATION:
NAME COUNTRY
KELLER, REINHOLD DR N/A
KONZ, ELMAR DR N/A
ASSIGNEE-INFORMATION:
NAME COUNTRY
HOECHST AG DE
APPL-NO: EP81103259
APPL-DATE: April 30, 1981
PRIORITY-DATA: DE03017393A (May 7, 1980)
INT-CL_(IPC): C07C043/23; C07C043/295 ; C07C041/18 ; C07C043/315
EUR-CL (EPC): C07C043/23; C07C043/305, C07C043/315 , C07C045/51 , C07C049/753
, C07D317/64
US-CL-CURRENT: 568/650,568/652
ABSTRACT:
Monoethers of hydroquinone are prepared by reduction of monoketals of
p-benzoquinone, preferably using complex hydrides of boron or aluminium, with a sulphite or molecular hydrogen in the presence of a nickel catalyst until one mole of H2/mole of p-benzoquinone monoketal is absorbed in an inert solvent to give the corresponding quinol ketals and treatment of these with an acid. The quinol ketals formed as intermediates here are novel compounds.
The monoethers of hydroquinone are precursors, intermediates and final products in various subject areas.
Patent EP39484
http://www.geocities.com/dritte123/PSPF.htmlThe hardest thing to explain is the obvious