Process for preparing unsaturated cyclic ethers

US6063939A · kind A · utility

Inventors

• Carsten Groning · Mannheim, DE
• Michael Hesse · Westlake Village, US
• Daniel Heineke · Ludwigshafen, DE
• Heinz-Josef Kneuper · Mannheim, DE
• Gerhard Fritz · Schifferstadt, DE

Key dates

• Filing date: Jan 7, 1999
• Grant date: May 16, 2000
• Expiry date: Jan 7, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D309/18
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Unsaturated cyclic ethers of the formula I ##STR1## where PA0 Z is --(CHR.sup.4).sub.q -- or --(CHR.sup.4).sub.q --O--, PA0 q is 0, 1, 2 or 3 and PA0 R.sup.1,R.sup.2,R.sup.3,R.sup.4 are hydrogen or C.sub.1 -C.sub.4 -alkyl are prepared by reacting diols of the formula II ##STR2## where Z, R.sup.1, R.sup.2 and R.sup.3 are as defined above, in the liquid phase at from 150 to 300.degree. C. in the presence of a cobalt-containing supported catalyst which has not been activated by reduction before use and comprises cobalt and a noble metal selected from the group consisting of platinum, palladium, rhodium, iridium, ruthenium, osmium, rhenium or a mixture thereof applied by sol impregnation on an inert support, wherein the supported catalyst is doped with sulfur. Sulfur-doped supported catalysts comprising cobalt and noble metals are also provided.