Bayer Aktiengesellschaft

Bernd Pennemann

Eberhard Zirngiebl

Joerg-Dietrich Jentsch

Alexander Klausener

Reinhard Langer

Gerhard Darsow

Heinz Landscheidt

Erich Wolters

Jorg-Dietrich Jentsch

Ursula Pentling

Volker Glock

Lutz Frohn

Christoph Tiburtius

Horst Koller

Eberhard Zirngbiebl

Bernd Lenders

Hydroxymethyl-cyclopropane (cyclopropyl-methanol) can be obtained in a manner which is both economical and environment-friendly by catalytic hydrogenation of cyclopropanecarboxylic acid alkyl esters under increased pressure at elevated temperature if a chromium-free zinc oxide catalyst is employed as the catalyst.

Process for the preparation of hydroxymethyl-cyclopropane

New hydrated niobium oxide and hydrated tantalum oxide catalysts containing pores having diameters in the range from 0.4 to 10,000 nm are characterized in that the volume of the pores of the catalyst having a diameter of from 100 to 1000 nm is at least 30% of the total pore volume of the catalyst. The catalysts can be prepared by mixing hydrated niobium oxide or hydrated tantalum oxide with an inert solid and converting this mixture into a solid pellet form, with the pressure in the apparatus for preparing catalysts in pellet form being set in such a way that the volume of the pores of the catalyst having a diameter of from 100 to 1000 nm is at least 30% of the total pore volume of the catalyst. Such catalysts are particularly suitable for preparing N-alkylanilines from anilines and alkanols.

Hydrated niobium oxide and hydrated tantalum oxide catalysts, their

Dimethyl carbonate is obtained with a high selectivity and great constancy over time by reacting carbon monoxide with methyl nitrite in a continuous gas phase reaction in the presence of a heterogeneous catalyst prepared by the application to a suitable support of one or more palladium compounds of the formula

Process for the preparation of dimethyl carbonate

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Bernd Pennemann