Process for the production of 8 .alpha., 12-oxido-13,14,15,16-tetranorlabdane

US5670670A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Georg Knuebel · Goldkronach, DE
• Andreas Bomhard · Biberach, DE
• Ulf-Armin Schaper · Krefeld, DE
• Theo Stalberg · Monheim, DE
• Thomas Markert · Monheim, DE

Key dates

• Filing date: May 31, 1996
• Grant date: Sep 23, 1997
• Expiry date: May 31, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D307/92
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In a process for the production of 8.alpha.,12-oxido-13,14,15,16-tetranorlabdane by dehydration of 8.alpha.,12-dihydroxy-13,14,15,16-tetranorlabdane (diol), wherein the diol is subjected to cyclizing dehydration in the presence of 5 to 80% by weight, based on the diol, of at least one alumino layer silicate selected from K catalysts which have an acid charge of less than 100 mval/100 g.