| abstract |
A PROCESS FOR THE PRODUCTION OF UNSATURATED CYCLIC ETHERS OF THE GENERAL FORMULA I IN WHICH ZDENOTES -(CHR⁴)q- OR -(CHR⁴)q-0-,qIS O,1, 2 OR 3 AND R¹, R², R³, AND R⁴ DENOTE HYDROGEN OR C₁- C₄ ALKYL BY CONVERSION OF DIOLS OF THE GENERAL FORMULA I IN WHICH Z, R¹, R² AND R³ HAVE THE AFOREMENTIONED MEANINGS, IN LIQUID PHASE AT TEMPERATURES OF FROM 150° TO 300°C IN THE PRESENCE OF A SULFUR-DOPED, COBALT-CONTAINING SUPPORTED CATALYST NOT ACTIVATED BY REDUCTION BEFORE USE AND CONTAINING COBALT AND A NOBLE METAL APPLIED TO AN INERT SUPPORT BY SOL IMPREGNATION AND SELECTED FROM THE GROUP COMPRISING PLATINUM, PALLADIUM, RHODIUM, IRIDIUM, RUTHENIUM, OSMIUM, RHENIUM, OR MIXTURE THEREOF, WHEREIN WATER IS ADDED. |